Effects of Corn Silage Hybrids and Dietary Nonforage Fiber Sources on Productive Performance in Early Lactating Dairy Cows Fed High Forage Diets

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Total Pages : 63 pages
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Book Synopsis Effects of Corn Silage Hybrids and Dietary Nonforage Fiber Sources on Productive Performance in Early Lactating Dairy Cows Fed High Forage Diets by : Michael Shane Holt

Download or read book Effects of Corn Silage Hybrids and Dietary Nonforage Fiber Sources on Productive Performance in Early Lactating Dairy Cows Fed High Forage Diets written by Michael Shane Holt and published by . This book was released on 2010 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment was conducted to determine the effects of corn silage hybrids and nonforage fiber sources (NFFS) in high forage diets formulated with high dietary proportion of alfalfa hay (AH) and corn silage (CS) on ruminal fermentation and productive performance by early lactating dairy cows. Eight multiparous Holstein cows (4 ruminally fistulated) averaging 36 " 6.2 d in milk were used in a duplicated 4 x 4 Latin square design experiment with a 2 x 2 factorial arrangement of treatments. Cows were fed 1 of 4 dietary treatments during each of the four 21-d periods. Treatments were: 1) conventional corn silage (CCS)-based diet without NFFS, 2) CCS-based diet with NFFS, 3) brown midrib corn silage (BMRCS)-based diet without NFFS, and 4) BMRCS-based diet with NFFS. Diets were isonitrogenous and isocaloric. Sources of NFFS consisted of ground soyhulls and pelleted beet pulp to replace a portion of AH and CS in the diets. In vitro 30-h NDF degradability was greater for BRMCS than CCS (42.3 vs. 31.2%). Neither CS hybrids nor NFFS affected intake of DM and nutrients. Digestibility of N, NDF, and ADF tended to be greater for cows consuming CCS-based diets. Milk yield was not influenced by CS hybrids and NFFS. However, a tendency for an interaction between CS hybrids and NFFS occurred with increasing milk yield due to feeding NFFS with the BMRCS-based diets. Yields of milk fat and 3.5% FCM decreased when feeding the BMRCS-based diet, and there was a tendency for an interaction between CS hybrids and NFFS by further decreased milk fat concentration because of feeding NFFS with BMRCS-based diet. Although feed efficiency (milk/DM intake) was not affected by corn silage hybrids and NFFS, there was an interaction between CS hybrids and NFFS because feed efficiency increased when NFFS was fed only with BMRCS-based diet. Total VFA production and individual molar proportion were not affected by diets. Dietary treatments did not influence ruminal pH profiles except that duration (h/d) of pH

Strategic Approaches To Develop Optimal Feeding Program of Brown Midrib Corn Silage to Lactating Dairy Cows in the Intermountain West

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Book Synopsis Strategic Approaches To Develop Optimal Feeding Program of Brown Midrib Corn Silage to Lactating Dairy Cows in the Intermountain West by : Michael Shane Holt

Download or read book Strategic Approaches To Develop Optimal Feeding Program of Brown Midrib Corn Silage to Lactating Dairy Cows in the Intermountain West written by Michael Shane Holt and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In two lactation studies reported in this dissertation, it was hypothesized that feeding 35% brown midrib corn silage (BMRCS) and 25% alfalfa hay (dry matter basis) would result in increased dry matter intake (DMI) around peak lactation compared with feeding conventional corn silage (CCS), causing longer peak milk production, and that feeding dairy cows in early lactation a 16% crude protein diet with fair quality alfalfa hay (FAH) in BMR-based diets would maintain milk production, reduce urinary N excretion, and improve N efficiency compared to those fed high quality alfalfa hay (HAH) in CCS- or BMR-based diets. A third experiment was conducted to assess in situ degradation kinetics of BMRCS harvested prior to or at maturity. The first lactation study was performed to determine the long-term effects of feeding BMRCS fed with a high dietary concentration of good quality alfalfa hay in a high-forage lactation diet on productive performance of Holstein dairy cows for the first 180 d of lactation. Feeding BMRCS-based diet did not affect milk production through peak lactation compared with a CCS-based diet; however, cows fed the BMRCS-based diet maintained heavier body weight through peak lactation and longer peak milk production, which resulted in increased milk yield post peak lactation, leading to greater overall milk production and milk protein yield. A second lactation experiment was performed to investigate if early lactating dairy cows fed with the FAH in BMRCS-based diets would reduce urinary N excretion and improve N efficiency compared to those fed the HAH in CCS- or BMR-based diets. Feeding BMR and HAH had better N utilization by decreasing concentrations of urea in blood, milk, and urine. In addition, feeding BMR-based diets decreased urinary N-to-fecal N ratio, and it was further reduced by feeding the HAH, which can represent an environmental advantage over traditional sources of forages in lactation dairy diets. A third experiment assessed in situ DM and neutral detergent fiber degradation kinetics for two new pre-matured BMR varieties (pmBMR1 and pmBMR2) that can be double-cropped by harvesting at tassel, compared with a sole crop mature BMR (mBMR) and CCS harvested at maturity in dry and lactating Holstein dairy cows. The potentially degradable NDF fraction was greater for BMR hybrids compared with CCS with the exception of the pmBMR2, which had the lowest potentially degradable NDF fraction in dry cows. Estimates of ruminal degradability of NDF were greatest for pmBMR1 in both dry and lactating cows. Feeding BMRCS exerted nutritive and environmental benefits when fed with typical Intermountain West lactation dairy diets. Further research is needed to understand interactive aspects of nutrient utilization with other dietary ingredients under different physiological conditions to take full potential benefits of BMRCS.

Sources of Variation in Corn Silage Quality and Feeding Value for Lactating Dairy Cows

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Total Pages : 300 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Sources of Variation in Corn Silage Quality and Feeding Value for Lactating Dairy Cows by : Carla Sjostrom Kuehn

Download or read book Sources of Variation in Corn Silage Quality and Feeding Value for Lactating Dairy Cows written by Carla Sjostrom Kuehn and published by . This book was released on 1999 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Cumulated Index Medicus

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ISBN 13 :
Total Pages : 1836 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Cumulated Index Medicus by :

Download or read book Cumulated Index Medicus written by and published by . This book was released on 2000 with total page 1836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Corn Silage Contributions to Energy Supply and Milk Fat Synthesis of Dairy Cows

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Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)

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Book Synopsis Corn Silage Contributions to Energy Supply and Milk Fat Synthesis of Dairy Cows by : Celso Heinzen Junior

Download or read book Corn Silage Contributions to Energy Supply and Milk Fat Synthesis of Dairy Cows written by Celso Heinzen Junior and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adequate energy supply to lactating dairy cows is essential to maximize genetic potential of milk production and efficiency. Corn silage often accounts for more than 50% of diets and therefore, corn starch is one of the main sources of energy fed to lactating dairy cows. However, the energy supply found in form of starch is dependent on its availability to the animal. Several strategies exist to improve starch digestibility in corn silages, including hybrid selection, kernel processing and prolonged storage. However, different ways to assess starch digestibility are used in the dairy industry and research, while ruminal disappearance is the most common procedure, it differs among laboratories, and much is unknown about how the analytical results of starch digestibility assays relates to in vivo digestibility and energy supply. Moreover, high inclusion of corn, in general, in dairy cattle diets are often related to milk fat depression, due to a highly fermentable carbohydrate source and unsaturated fatty acids profile that corn provides. Therefore, a series of experiments were conducted to evaluate a novel technology of corn silage hybrids effects on silage fermentation and starch digestibility, to better understand the sources of variation on starch digestibility assays to improve sample comparison, and to assess the risks of feeding starch and fatty acids from corn silage in milk fat depression.Two experiments were conducted to evaluate the effects of a genetically-modified corn hybrid with alpha-amylase expressed in the kernel (AMY) on fermentation profile, aerobic stability, nutrient composition, and starch disappearance of whole-plant corn silage (WPCS) and earlage. Both hybrids, AMY and its isogenic counterpart (ISO), were grown in 10 replicated plots (5 for WPCS and 5 for earlage). Samples of each plot were collected at harvest, homogenized, and divided into 5 subsamples which were randomly assigned to 5 storage lengths (0, 30, 60, 90 and 120 d). Minor differences on fermentation profile were observed between AMY and ISO for WPCS and earlage. Starch concentration was greater for AMY than ISO in WPCS and earlage and greater starch disappearances at 0 h and 6 h were observed for ISO in WPCS and earlage. Minor effects on fermentation profile, microbial counts, aerobic stability, and nutrient composition suggests that AMY can be ensiled for prolonged periods with no concerns for undesirable fermentation or nutrient losses. However, in situ starch disappearance was lower for AMY compared to ISO. A series of experiments was conducted to investigate variation across time-points, sample grinding size procedures and bag pore sizes used in ruminal starch digestibility assays. Experiment 1: samples of different starch sources submitted three times to multiple laboratories to evaluate variability of starch digestibility assays and the use of different incubation time-points on feedstuff ranking. Greater variation was observed for shorter incubation time-points, while different submission of samples did not influence starch digestibility for corn forage and corn grain samples. Moreover, different incubation time-points can change the ranking of samples. Experiment 2: samples of different starch sources were used to investigate how different grinding sizes and incubation time-point procedures affect starch digestibility assays variation and ranking of samples. Longer incubation time-points and finely ground samples reduced variation of in vitro starch digestibility assays; however, smaller grinding size increased starch digestibility in all starch sources and affected sample ranking. Experiment 3: samples from different starch sources were incubated in situ at 0 h to investigate the loss of particles and their influence on ruminal kinetics. Our results suggest that secondary loss of particles on ruminal incubations at 0 h might be a problem that limits the relationship between bag disappearance and degradation in forage and corn grain samples. Experiment 4: dry ground corn and pure starch samples were washed in water at different temperatures and using different filter types (Dacron polyester in situ bags, Ankom Technology; DPB, F57 bags, Ankom Technology; F57 or filter papers Whatman G3; WG3) to understand their effects on DM recovery. Samples incubated in room temperature water had greater DM recovery when compared to samples incubated in water at 39℗ð C. Pure starch had greater DM recovery in F57 and WG3 when compared to DPB, however, dry ground corn samples DM recovery was similar across all filter types. Experiment 5: dry ground corn and pure starch samples were incubated in rumen fluid at 0 h, using different filter bags (F57 and DPB) to investigate the effect of sample type and filter bags on DM and starch recovery. F57 bags were able to retain 100% of the starch incubated in pure starch, however, no difference between bags were found for dry ground corn samples for DM or starch recovery. These experiments highlighted the importance of the consideration of specific procedures in starch digestibility assays when ranking samples or generating information for ration formulation. The objective of the last study was to investigate the effects of dietary fatty acids and starch on milk fat secretion, the fatty acid profile changes in whole-plant corn silage (WPCS) and high-moisture corn (HMC) with different silage management practices as well as the contributions of these nutrients derived from WPCS and HMC to milk fat secretion. Twenty-three published studies that evaluated lipids supplementation to dairy cows were included in the dataset and meta-regressions analysis were conducted to model the effects of: 1) dietary fatty acids, starch and forage concentrations (expressed as % of DM) on milk fatty acids concentration (expressed as g/100g); 2) dietary fatty acids, starch and forage concentrations (expressed as % of DM) on milk fatty acids yield (expressed as g/d); 3) intake of fatty acids (expressed as g/d), starch, and forage (expressed as kg/d) on milk fatty acids concentration (expressed as g/100g); and 4) intake of fatty acids (expressed as g/d), starch and forage (expressed as kg/d) on milk fatty acids yield (expressed as g/d). While predictions of milk fatty acids concentrations are useful, models that predict milk fatty acids yield had greater performance. In general, starch concentration and starch intake had a positive effect on de novo and total milk fatty acids yield, while unsaturated fatty acids had a negative effect. Samples of WPCS and HMC from previous studies from our laboratory were analyzed for fatty acids profile to evaluate the effects of cutting height and storage length on fatty acids profile of WPCS and the effects of DM concentration and storage length on fatty acids profile of HMC. Increasing cutting height increased unsaturated fatty acids in WPCS, however, storage length and DM concentration effects did not follow a clear pattern of changes in fatty acids profile of WPCS and HMC. Simulations using the generated models were conducted to visualize the contributions of different inclusions of WPCS and HMC in the diet as well as different WPCS and HMC management practices to milk fat secretion. Our results suggest that energy contributions from starch and saturated fatty acids are important in milk fat synthesis predictions, while supporting the general role of unsaturated fatty acids on milk fat depression described in the literature. Management practices like cutting height, dry matter concentration and storage length affect fatty acids profile of WPCS and HMC and it may affect rumen bacteria metabolism and milk fat secretion.

Effect of Feeding Corn Silage Based Diets Predicted to be Deficient in Either Ruminal Nitrogen Or Metabolizable Protein on Nitrogen Utilization and Efficiency of Use in Lactating Cows

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Total Pages : 206 pages
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Book Synopsis Effect of Feeding Corn Silage Based Diets Predicted to be Deficient in Either Ruminal Nitrogen Or Metabolizable Protein on Nitrogen Utilization and Efficiency of Use in Lactating Cows by : Erin Beth Recktenwald

Download or read book Effect of Feeding Corn Silage Based Diets Predicted to be Deficient in Either Ruminal Nitrogen Or Metabolizable Protein on Nitrogen Utilization and Efficiency of Use in Lactating Cows written by Erin Beth Recktenwald and published by . This book was released on 2007 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to concern over nitrogen (N) emissions, this study attempted to evaluate dietary approaches to reduce N excretion by dairy cattle. Knowledge about potential N sources that were either unaccounted for or under-predicted by CPM Dairy and the Dairy NRC (2001) was used to formulate rations that were much lower in crude protein (CP) than typically fed to dairy cattle but would potentially not decrease production. Specifically, the three diets fed were predicted to have: (1) positive rumen N and metabolizable protein (MP) balances (Diet P) (2) negative MP balance and positive rumen N balance (Diet N), or (3) negative rumen N balance but positive MP balance (Diet T) as predicted by CPM Dairy version 3. The objective of this experiment was to determine whether, and to what extent, the decrease in predicted ruminally available N and MP supply would affect milk production. Eighty-eight multiparous lactating Holstein cows (83 ± 20 DIM), were blocked by average daily milk yield to 50 DIM and parity and assigned to three diets differing in N content or predicted rumen degradability of the feed N. The diets were formulated with CPM Dairy V3 using library values for all feeds except corn silage where actual chemical, digestibility, and degradation rate values were determined and used. The diets (DM basis) consisted of approximately 50% corn silage, 2% wheat straw and 48% of a diet specific ingredient mix and were formulated for 22.2 of kg DMI. Actual diet CP levels were 16.7, 14.2 and 14.3% for Diets P, N and T, respectively. The predicted CPM Dairy rumen N balance at the formulated DMI was 29 and 27 g for Diets P and N and negative 39 g/d for Diet T, whereas the predicted MP balance was 263 and negative 145 and 91 g/d for Diets P, N and T, respectively. Monensin was included in the diets at a formulated intake of approximately 300 mg per cow per d and somatotropin was administered per label. Actual DMI for cattle fed these treatments were 25.7, 25.5 and 24.2 kg/d for Diets P, N and T, respectively and were significantly lower for Diet T. Actual milk yield was 45.0, 42.6 and 43.3 kg/d and 3.5% FCM was 38.1, 36.5, and 36.4 kg/d for cows fed Diets P, N and T, respectively and was significantly lower for cows fed Diets N and T. Milk protein percent was not affected by diet; however, milk protein yield was significantly greater for cows fed Diet P due to the difference in milk yield. Plasma urea N concentrations were 11.31, 8.40 and 7.13 mg/dl for cows fed diets P, N and T, respectively and were different and paralleled the rumen ammonia levels of 8.32, 6.58 and 5.84 mg/dl. Milk fat depression (MFD) was observed in all cows and was not affected by treatment, and the average milk fat levels were 2.67, 2.68 and 2.54% for diets P, N and T, respectively. To determine if monensin was partially responsible for the MFD, monensin was removed from the diets of approximately half of the cows on treatment once they had finished the experimental period. Removal of monensin resulted in a 30% increase in milk fat percent, and milk protein content was not affected. Calculated milk N:intake N ratios for the three treatments were 0.31, 0.33 and 0.36 for Diets P, N and T respectively. The results of this study suggest that more productive N is available than currently predicted by either CPM Dairy and the Dairy NRC (2001). Understanding where these differences exist would allow for feeding less CP to dairy cattle and decreasing N emissions to the environment. It may also be a profitable strategy for dairy farmers, as they would be able to reduce their purchase of costly protein feeds, but that was not demonstrated in this study - primarily due to the severe milk fat depression that decreased the economic value of milk. However, ration cost was not a concern for this experiment, and that aspect can be considered when implementing feeding strategies stemming from this research. (Abstract).

High Energy Corn Silage for Lactating Dairy Cattle

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Total Pages : 16 pages
Book Rating : 4.:/5 (89 download)

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Download or read book High Energy Corn Silage for Lactating Dairy Cattle written by and published by . This book was released on 1969 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Interaction of Corn Silage Processing and Nonforage Sources of Fiber for Lactating Dairy Cattle

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ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (498 download)

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Book Synopsis Interaction of Corn Silage Processing and Nonforage Sources of Fiber for Lactating Dairy Cattle by : Jason A. Mills

Download or read book Interaction of Corn Silage Processing and Nonforage Sources of Fiber for Lactating Dairy Cattle written by Jason A. Mills and published by . This book was released on 2002 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effects of BM3 Corn Silage on the Lactational Performance of Dairy Cows

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ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Effects of BM3 Corn Silage on the Lactational Performance of Dairy Cows by : Richard A. Longuski

Download or read book Effects of BM3 Corn Silage on the Lactational Performance of Dairy Cows written by Richard A. Longuski and published by . This book was released on 2003 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Neutral Detergent Fiber Concentration and Digestibility in Corn Silage Influences Digesta Kinetics, Dry Matter Intake, and Performance of Growing Steers

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Total Pages : 324 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Neutral Detergent Fiber Concentration and Digestibility in Corn Silage Influences Digesta Kinetics, Dry Matter Intake, and Performance of Growing Steers by : Kent Eric Tjardes

Download or read book Neutral Detergent Fiber Concentration and Digestibility in Corn Silage Influences Digesta Kinetics, Dry Matter Intake, and Performance of Growing Steers written by Kent Eric Tjardes and published by . This book was released on 2001 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Bibliography of Agriculture

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Total Pages : 2312 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Bibliography of Agriculture by :

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1998 with total page 2312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Strategies to Increase Starch and NDF Digestibility in Whole-plant Corn Silage and High-moisture Corn

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Total Pages : 0 pages
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Book Synopsis Strategies to Increase Starch and NDF Digestibility in Whole-plant Corn Silage and High-moisture Corn by :

Download or read book Strategies to Increase Starch and NDF Digestibility in Whole-plant Corn Silage and High-moisture Corn written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corn is the predominant feed energy source in the dairy industry and can be fed as forage or concentrate. Thus, increasing starch (ivSD) and NDF digestibility of whole-plant corn silage (WPCS) and starch digestibility in high-moisture corn (HMC) may improve lactation performance by dairy cows. Kernel processing is an essential practice in WPCS production and SHRD may be a potential tool for dairy farmers desiring to harvest WPCS at a greater length of cut without compromising kernel breakage. Extended ensiling time did not attenuate the negative effects of vitreousness and maturity at harvest on ivSD but increased ivSD in WPCS of varied hybrid types, maturities, chop lengths and processors. Likewise, greater ivSD was observed when HMC was harvested at lower DM content or ensiled for an extended period. These data underscore the importance of hybrid selection, proper maturity at harvest, kernel breakage and ensiling time to achieve maximum ivSD. Results from our WPCS hybrid feeding trial imply that hybrid selection programs focusing on increasing starch digestibility by dairy cows through selection of softer kernel texture are feasible. Furthermore, our ensiling time mini-silos studies suggest that extended storage not only may not attenuate the negative effects of vitreousness on ivSD but may also increase this difference. Lactation performance results from a feeding trial and a meta-analysis highlighted the importance of fiber digestibility in hybrid selection programs for silage production and reinforced its use in the formulation of diets for high-producing dairy cows. In addition, ivNDFD was influenced by hybrid type but not ensiling time in a mini-silo trial, indicating that hybrid selection is more important than ensiling practices for improving NDF digestibility in WPCS. Despite the benefits of greater fiber digestibility on lactation performance, feed efficiency was not improved and starch digestibility was reduced when feeding these hybrids. The use of additives at ensiling to increase ivSD in WPCS and HMC remains uncertain. Exogenous protease attenuated but did not overcome negative effects of maturity on WPCS. In contrast, protease increased ivSD in un-ensiled and ensiled rehydrated corn and HMC. The use of bacterial inoculants did not increase ivSD.

Effect of Crude Protein Level in Alfalfa and Corn Silage Based Diets on Lactational Performance, Milk Urea Nitrogen and Urine and Fecal Nitrogen

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Total Pages : 256 pages
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Book Synopsis Effect of Crude Protein Level in Alfalfa and Corn Silage Based Diets on Lactational Performance, Milk Urea Nitrogen and Urine and Fecal Nitrogen by : Kita Louise Karg

Download or read book Effect of Crude Protein Level in Alfalfa and Corn Silage Based Diets on Lactational Performance, Milk Urea Nitrogen and Urine and Fecal Nitrogen written by Kita Louise Karg and published by . This book was released on 2003 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Evaluation of an Amylase-enabled Corn Silage in Lactating Cows

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ISBN 13 :
Total Pages : pages
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Book Synopsis Evaluation of an Amylase-enabled Corn Silage in Lactating Cows by : Sergio Cueva Welchez

Download or read book Evaluation of an Amylase-enabled Corn Silage in Lactating Cows written by Sergio Cueva Welchez and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment was conducted to investigate the effects of an amylase-enabled corn silage on the lactation performance, enteric gas emission and rumen fermentation of lactating dairy cows. The amylase-enabled corn hybrid (Enogen; Syngenta Seeds LLC) was harvested, ensiled, and included in the diet at 40% of dry matter (DM) of the cows. The Enogen corn silage (ECS) was compared with silage from a control (CON) isogenic corn hybrid without the amylase trait. Both silages were included at the same inclusion rate of dietary DM and the diet fed, with exception of the silage source, was identical between the treatments. The purpose of the experiment was to investigate the effect of ECS on lactational performance, enteric gas emission, and rumen fermentation of lactating dairy cows. Both corn hybrids were grown for approximately 130 d, and silages were fermented for approximately 220 d before the beginning of the animal experiment in April 2019. At harvest, the CON hybrid yielded approximated 1.1 t of DM/ha more than the ECS hybrid. Crude protein concentration was 6% lesser in ECS when compared with the CON hybrid. Acid detergent fiber was also 3.9% lesser for ECS. Furthermore, the ECS was greater in starch content, when compared with the CON (9.3%, on average). As expected, the amylase activity in ECS was 13-fold greater when compared with the CON silage. Nevertheless, the differences mentioned in the nutritional content of the silages, did not result in major differences in fermentation end-products between the silages. Inclusion of ECS at 40% dietary DM did not affect DMI but increased MY (40.8 vs 38.8 kg/d), improved feed efficiency (1.55 vs. 1.47 kg/kg) and tended to improve energy-corrected milk yield (ECM) feed efficiency in lactating cows (1.50 vs. 1.45 kg/kg). Milk lactose was greater (4.92 vs 4.86 %) for cows fed the ECS diet, relative to CON, but milk protein and fat contents were similar. Methane emission intensity (per unit of milk yield) was decreased by the ECS diet compared with CON; however, treatment did not affect CH4 emission intensity expressed per kilogram of ECM. Rumen fermentation, apart from a decreased molar proportion of butyrate in rumen fluid of ECS-fed cows, was not affected by treatment. Amylase activity was numerically, but not statistically, greater in rumen fluid of ECS-fed cows, however, the difference could be related both to a greater amylase activity in ECS (as previously described) and greater starch intake with the ECS diet, when compared with CON. As suspected, intake of starch was greater in cows fed the ECS diet relative to CON, and apparent total-tract DM digestibility also tended to be greater in cows fed the ECS. There were no differences in intakes in any of the other nutrients or their apparent total-tract digestibility. Nitrogen intake and utilization, as well as urinary purine derivative excretion, were not affected by the silage treatment. Effects induced by ECS were likely a result of the greater starch content in ECS and greater overall availability of digestible nutrients. Moreover, given that ECS decreased CH4 emission intensity (per unit of MY, but not of ECM), data would suggest that the carbon footprint of milk production could be reduced by inclusion of ECS, Inclusion of an amylase-enabled hybrid in dairy rations showed promising effects by improving feed efficiency and ECM feed efficiency in dairy cows. However, the amylase-enabled corn silage used in the current experiment tended to have a greater overall availability of digestible nutrients and was greater in starch content, when compared with its isogenic counterpart. In this regard, effects observed on cow performance can be attributed, at least partially, to differences in silage nutritional composition. Research investigating the effects of feeding amylase-enabled corn silages to dairy cows is limited. This makes it challenging to concretely determine the mode and extent of action of the amylase enzyme in the current study. Thus, future research on amylase-enabled hybrids should be focused on determining modes and stages of action of the enzyme, potential nutritional and environmental benefits in dairy cows, and possible interactions with other additives or dietary ingredients. The amylase-enabled technology seems to be promising, however, questions remain that must be answered to fully understand the benefits of the inclusion of amylase-enabled corn in dairy cow diets.

Agrindex

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Total Pages : 1052 pages
Book Rating : 4.E/5 ( download)

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Download or read book Agrindex written by and published by . This book was released on 1995 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Corn Silage Diets Upon Intake, Production, Blood and Health Responses in Dairy Cattle

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ISBN 13 :
Total Pages : 480 pages
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Book Synopsis Effect of Corn Silage Diets Upon Intake, Production, Blood and Health Responses in Dairy Cattle by : Ronald Leslie Belyea

Download or read book Effect of Corn Silage Diets Upon Intake, Production, Blood and Health Responses in Dairy Cattle written by Ronald Leslie Belyea and published by . This book was released on 1974 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nutritive Evaluation of Corn Silage

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Total Pages : 414 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Nutritive Evaluation of Corn Silage by : Gonzalo Ferreira

Download or read book Nutritive Evaluation of Corn Silage written by Gonzalo Ferreira and published by . This book was released on 2002 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: