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A Comparison Of Various Management Systems On Conception After Synchronization Of Estrus In Beef Cows
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Book Synopsis A Comparison of Various Management Systems on Conception After Synchronization of Estrus in Beef Cows by : Margaret Heekin
Download or read book A Comparison of Various Management Systems on Conception After Synchronization of Estrus in Beef Cows written by Margaret Heekin and published by . This book was released on 1977 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Estrous Synchronization Management Systems in Beef Cattle by : Robert Glenn Haynes
Download or read book A Comparison of Estrous Synchronization Management Systems in Beef Cattle written by Robert Glenn Haynes and published by . This book was released on 1983 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Progestin Based Protocols to Synchronize Estrus and Ovulation in Beef Cows by : Daniel Joseph Schafer
Download or read book Comparison of Progestin Based Protocols to Synchronize Estrus and Ovulation in Beef Cows written by Daniel Joseph Schafer and published by . This book was released on 2005 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beef Cattle Management Systems for Estrus Synchronization and Heifer Development by : Hazy Rae Nielson
Download or read book Beef Cattle Management Systems for Estrus Synchronization and Heifer Development written by Hazy Rae Nielson and published by . This book was released on 2015 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four experiments were conducted to evaluate estrus synchronization and heifer development systems. In the first experiment delaying AI 19 h following GnRH administration in a hybrid estrus detection and time AI protocol was evaluated. Final pregnancy rate was not different among heifers detected in estrus, AI at the time GnRH administration, or delayed AI. The second study compared the effect of melengestrol acetate (MGA) -PG and 14-d controlled internal drug release (CIDR) -PG estrus synchronization protocols on estrus response and pregnancy rates of 311 d old heifers. Final pregnancy rate was similar between CIDR and MGA treatment groups. The objective of the third study was to determine the impact of heifer development system on subsequent growth and reproductive performance in 2 breeding seasons. Heifers were offered ad libitum meadow hay (HAY) and 1.81 kg/d (29% CP, DM basis) supplement or allowed to graze meadow (MDW) and 0.45 kg/d supplement. Although ADG during the winter feeding period was greater for HAY heifers, BW was similar between treatments in the spring, summer, and at pregnancy diagnosis suggesting a compensatory growth effect for MDW heifers. Similarly, pubertal status or pregnancy rate was not different, indicating a lower input winter management system is viable to maintain heifer pubertal status and pregnancy rates in 2 breeding seasons. Finally, to determine the impact of heifer development system on pregnancy rates and feed efficiency as a pregnant first calf heifer a 3 yr study was conducted. In Yr 1, weaned heifers either grazed corn residue (CR) or were fed in a drylot (DLHI). In Yr 2 and 3 heifers either grazed CR, upland range (RANGE), or were fed diets differing in energy, high (DLHI) or low (DLLO), in a drylot setting. Pregnancy rates to AI were similar among treatments. A subset of AI-pregnant heifers from each treatment were placed in a Calan gate system. Intake did not differ among treatments, either as DMI or as a percentage of BW.
Book Synopsis Managing Cattle Reproduction by : Daniel V. Chavez
Download or read book Managing Cattle Reproduction written by Daniel V. Chavez and published by . This book was released on 2018 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficiency of reproduction is crucial for successful cow-calf operations. Cows naturally have varying timing of estrous cycles between cohorts and manipulation of current estrus synchronization and artificial insemination (AI) techniques may prove pivotal in increasing conception rates. The objective of these experiments was to determine if alternative methods of estrus synchronization or AI may increase incidence of successful fertilization and pregnancy, either by bull or AI. In Exp. 1, 168 (n = 84 each year) crossbred and purebred Angus two and three year old beef cows were randomly assigned to one of two estrus synchronization treatment groups: 1) a Controlled internal drug release (CIDR) and GnRH administration d-7, removal of CIDR and PG administration d 0, or 2) PG administration on d 5. Bulls were turned out d 0 at a bull to cow ratio of 1:17 for 90 d. Blood samples were taken approximately 30 d after bull turn out and 45 d after bull removal to determine pregnancy. Estrus detection patches were used to determine estrus. Although estrus response was greater in CIDR than PG (P = 0.02), early pregnancy (P = 0.92) and final pregnancy rates (P = 0.89) were not different. However, estrus response in the first 5 d was greater (P
Book Synopsis Comparison of Long-term CIDR-based Protocols to Synchronize Estrus in Postpartum Beef Cows by : Justin Michael Nash
Download or read book Comparison of Long-term CIDR-based Protocols to Synchronize Estrus in Postpartum Beef Cows written by Justin Michael Nash and published by . This book was released on 2011 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estrus synchronization and artificial insemination are two of the most important management practices available to producers to increase reproductive performance in a beef cow-calf operation. Unfortunately, a small number of producers utilize these practices due to increased labor requirements. The use of fixed-time artificial insemination (FTAI) reduces the amount of time and labor required to detect estrus, leading to decreased input requirements. The following experiments were performed in order to compare the use of long-term controlled internal drug release (CIDR) insert-based estrus synchronization protocols prior to FTAI in estrous-cycling and anestrous postpartum beef cows. In experiments 1 and 2, two long-term CIDR-based estrus synchronization protocols were compared on the basis of physiological characteristics, including serum steroid hormone concentrations, estrous response, and follicular dynamics, as well as pregnancy rates resulting from FTAI. From these intensive trials, it was determined that both protocols yielded comparable pregnancy rates and similar physiological responses when used in postpartum beef cows. In experiment 3, the use of either a long- or short-term CIDR-based estrus synchronization protocol was compared prior to FTAI in a large-scale field trial. Results indicated that pregnancy rate resulting from FTAI was similar for both protocols. These data provide preliminary support for the use of long-term CIDR-based estrus synchronization protocols prior to FTAI in postpartum beef cows.
Book Synopsis A comparison of Syncro-Mate-B and Lutalyse estrous synchronization systems in beef cows by : Jana De Boe Howard
Download or read book A comparison of Syncro-Mate-B and Lutalyse estrous synchronization systems in beef cows written by Jana De Boe Howard and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Long-term Progestin-based Protocols to Synchronize Estrus in Beef Heifers by : Daniel A. Mallory
Download or read book Comparison of Long-term Progestin-based Protocols to Synchronize Estrus in Beef Heifers written by Daniel A. Mallory and published by . This book was released on 2009 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiment 1 evaluated two long-term progestin-based and controlled internal drug release estrus synchronization protocols to determine their potential to facilitate fixed-time artificial insemination in estrous cycling and prepubertal beef heifers. Conception to AI, AI pregnancy, and final pregnancy rates did not differ between treatments. Experiment 2 compared two long-term progestin-based estrus synchronization protocols to evaluate their potential to facilitate fixed-time artificial insemination in estrous cycling and prepubertal beef heifers. Estrous response after PG was greater among CIDR treated heifers compared to MGA treated heifers. Conception to AI, AI pregnancy, and final pregnancy rates did not differ between treatments. In summary, the long-term CIDR protocol compared favorably with the MGA protocol. Experiment 3 was conducted to compare pregnancy rates resulting from fixed-time AI after administration of either one of two long-term CIDR-based protocols. CIDR-GnRH-PG and CIDR-PG treated heifers were fixed-time inseminated at 72 or 66 hr after PG, respectively. Fixed-time AI pregnancy rates tended to be higher among CIDR-PG compared to CIDR-GnRH-PG treated heifers. Final pregnancy rates did not differ between treatments. In summary, both long-term progestin-based protocols were effective in synchronizing estrus prior to fixed-time AI in beef heifers.
Book Synopsis Comparison of CIDR-based Protocols to Synchronize Estrus in Beef Heifers by : Nicole Renee Leitman
Download or read book Comparison of CIDR-based Protocols to Synchronize Estrus in Beef Heifers written by Nicole Renee Leitman and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Estrus synchronization and artificial insemination (AI) are reproductive management techniques that allow beef producers to enhance the reproductive efficiency and genetic composition of their cow herd. However, U.S. beef producers have been reluctant to adopt these reproductive management tools, largely due to time and labor. Recent research to synchronize estrus, therefore, has focused on the development of estrus synchronization protocols that facilitate fixed-time AI (FTAI). Although protocols have been developed that allow the successful use of FTAI in beef cows, the same degree of success in beef heifers has not been realized. Additionally, no published research has focused on characterizing the physiological responses to long- and short-term CIDR-based protocols in beef heifers. Experiment 1 evaluated ovulatory response to GnRH and synchrony of estrus and ovulation after PGF2[alpha] (PG) in beef heifers. The CIDR Select and Select Synch + CIDR protocols were evaluated among estrous cycling and prepubertal beef heifers and the CIDR-PG and Select Synch protocols were evaluated among estrous cycling beef heifers. A reduced variance for the intervals to estrus and ovulation was detected for estrous cycling heifers treated with the CIDR Select protocol in comparison to the other 3 treatments. The combined results of the estrous cycling and prepubertal heifers revealed an increased ovulatory response to GnRH for heifers treated with the CIDR Select protocol compared to the Select Synch + CIDR protocol, which ultimately resulted in a reduced variance for interval to estrus and ovulation after PG. Furthermore, no differences within treatment were detected in the variance for interval to estrus or ovulation among estrous cycling and prepubertal heifers treated with the CIDR Select protocol. These results suggest that the CIDR Select protocol may facilitate FTAI more effectively in mixed groups of estrous cycling and prepubertal beef heifers. Experiments 2 and 3 evaluated modifications to the CIDR Select protocol. Estrous cycling beef heifers were used in Exp. 2. The hypothesis tested was that reducing the interval from CIDR removal to GnRH administration by 2 d would facilitate an improvement in the synchrony of estrus after PG. Although a larger number of heifers that were assigned to the 28 d protocol were on d 5 and 6 at the time GnRH was administered, response to GnRH was not improved and synchrony of estrus was not enhanced following PG. In Exp. 3, a second modification to the CIDR Select protocol was evaluated using estrous cycling and prepubertal beef heifers. The hypotheses tested were: 1) reducing the interval from CIDR removal to GnRH may facilitate an improvement in the synchrony of estrus after PG, and 2) the addition of GnRH following CIDR removal is required to improve the synchrony of estrus after PG. Although no difference in estrous response was detected, mean intervals to estrus and variance for interval to estrus differed based on the interaction of treatment length, GnRH, and estrous cyclicity status. The results from Exp. 3 clearly suggest that further evaluation of long-term CIDR-based protocols is required.
Book Synopsis Management Practices to Optimize Reproductive Efficiency in Primiparous and Multiparous Suckled Beef Cows by : Jonathan F. Bader
Download or read book Management Practices to Optimize Reproductive Efficiency in Primiparous and Multiparous Suckled Beef Cows written by Jonathan F. Bader and published by . This book was released on 2003 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous work from our laboratory suggests that prepartum supplementation with whole soybeans (WSB) improves first service conception rate without affecting body condition score or estrous cyclicity status prior to initiation of estrus synchronization protocols in postpartum beef cows. The objective of the first experiment was to examine the effects of prepartum lipid supplementation to superstimulated multiparous suckled beef cows and subsequent results on embryo quantity and quality. There was no difference between treatments in quantity or quality of embryos recovered. These findings suggest that prepartum supplementation of WSB to superstimulated multiparous suckled beef cows does not affect the quantity and quality of embryos recovered. Our research has also focused on estrus synchronization and facilitating the use of fixed-time artificial insemination (AI) in beef cows. The second experiment was designed to compare pregnancy rates of postpartum beef cows resulting from fixed-time AI and after synchronization of estrus with either the 7-11 Synch or MGA ® Select protocols. The results from this experiment indicate that estrus synchronization with 7-11 Synch or MGA ® followed by fixed-timed AI (GnRH at AI) result in comparable pregnancy rates in postpartum beef cows. Both protocols may be effectively utilized by producers for fixed-time AI.
Book Synopsis Evaluation of Long-term CIDR-based Estrus Synchronization Protocols in Primiparous Two-year-old Beef Cows by : Jillian Mae Abel
Download or read book Evaluation of Long-term CIDR-based Estrus Synchronization Protocols in Primiparous Two-year-old Beef Cows written by Jillian Mae Abel and published by . This book was released on 2015 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development and comparison of strategies designed to enhance reproductive management of primiparous two-year-old beef cows coincide with the recent increase in heifer retention and the significant number of younger age females that are now entering the U.S. cow herd. Reproductive management of primiparous two-year-old cows presents a unique challenge in managing a beef herd, since this age group of females typically experiences the highest incidence of reproductive failure. Strategic management of replacement beef heifers and primiparous cows is necessary to ensure their continued long-term reproductive success, which provides the opportunity for beef producers to increase retention rates, reduce input costs, and ultimately enhance production efficiency. Estrus synchronization and artificial insemination (AI) are important management tools available to producers that facilitate genetic improvement and enhance reproductive efficiency. A list of recommended protocols may be used to facilitate fixed-time AI (FTAI) in beef cows and heifers, and we now know that specific protocols perform better among various age classes of females. Short-term controlled internal drug release (CIDR)-based protocols are currently the preferred method to synchronize estrus prior to FTAI in postpartum beef cows. Alternatively, long-term CIDR-based protocols have been used with greater success in beef heifers. Progestin-based estrus synchronization protocols offer the potential to induce estrous cyclicity in anestrous postpartum cows and advance conception date. Experiment 1 was designed to compare the 14-d CIDR-PG (14-d) and 7-d CO-Synch + CIDR (7-d) protocols on the basis of estrous response, pregnancy rates after fixed-time AI (FTAI), and final pregnancy in primiparous two-year-old cows. Cows assigned to 14-d (n = 355) received a CIDR insert on Day 0 with removal on Day 14. Cows assigned to 7-d (n = 349) received GnRH and CIDR inserts on Day 23. On Day 30 CIDRs were removed from 7-d cows and PGF2[alpha] was administered to all cows in each treatment. On Day 33, 66 and 72 h after PGF2[alpha], GnRH was administered concurrent with FTAI. Estrous response at FTAI was higher for 7-d compared to 14-d cows (74% vs 43%, respectively; P
Book Synopsis Synchronization of Estrus in Beef Cattle by : Carroll D. Middleton
Download or read book Synchronization of Estrus in Beef Cattle written by Carroll D. Middleton and published by . This book was released on 1985 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bovine Reproduction by : Richard M. Hopper
Download or read book Bovine Reproduction written by Richard M. Hopper and published by John Wiley & Sons. This book was released on 2014-08-18 with total page 2206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bovine Reproduction is a comprehensive, current reference providing information on all aspects of reproduction in the bull and cow. Offering fundamental knowledge on evaluating and restoring fertility in the bovine patient, the book also places information in the context of herd health where appropriate for a truly global view of bovine theriogenology. Printed in full color throughout, the book includes 83 chapters and more than 550 images, making it the most exhaustive reference available on this topic. Each section covers anatomy and physiology, breeding management, and reproductive surgery, as well as obstetrics and pregnancy wastage in the cow. Bovine Reproduction is a welcome resource for bovine practitioners, theriogenologists, and animal scientists, as well as veterinary students and residents with an interest in the cow.
Book Synopsis Beef Systems Management Strategies: Calving Date Selection, Estrus Synchronization, and Post-weaning Management by : Benjamin T. Tibbitts
Download or read book Beef Systems Management Strategies: Calving Date Selection, Estrus Synchronization, and Post-weaning Management written by Benjamin T. Tibbitts and published by . This book was released on 2016 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of an invited review and four experiments was to evaluate production implications and economic efficiencies of beef systems strategies involving calving date selection, utilization of reproductive technology, and post-weaning management of heifers and steers. The invited review in chapter II considers factors that influence a producer’s decision on when to calve beef females. The calving date decision impacts the entire beef production cycle and must take into account any environmental conditions, available resources, and cite specific advantages and/or disadvantages. Understanding the importance of varying physiological state and nutrient demands associated with lactation and gestation is critical to optimizing calving date. Calving systems vary across geographic regions. The associated differences in management strategies, along with economic drivers, contribute to the complexity of the calving date decision. Chapter III evaluates the effects of overwinter nutrition on subsequent May calving cow performance. Supplemented cows had increased (P
Book Synopsis Synchronization and Ovarian Development in Dairy Cows and Heifers by : Rebecca L. J. Coral Escalante
Download or read book Synchronization and Ovarian Development in Dairy Cows and Heifers written by Rebecca L. J. Coral Escalante and published by . This book was released on 2012 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reproductive management is an important factor for improving reproductive efficiency in the dairy industry. Reproductive efficiency affects the profitability of the dairy herd by decreasing days not pregnant and increasing milk produced in a cow's lifetime. There are many reproductive programs used to synchronize the estrous cycle. Prostaglandin F2[alpha] (PGF2[alpha])-based programs synchronize estrus before artificial insemination (AI) after observed estrus. Some disadvantages to PGF2[alpha]-based reproductive programs are time requirements necessary for estrus detection (2 to 3 times/d for about 30 min) and lack of estrus activity observed in dairy cows (only about 40% will show estrus). An advantage to PGF2[alpha]-based reproductive programs is acceptable conception rates (about 45 to 60%) that can surpass timed AI (TAI). Reproductive programs that employ TAI are achieved by synchronization of ovulation with a series of PGF2[alpha] and gonadotropin releasing hormone (GnRH) injections followed by insemination 16 h later. Some of the advantages to synchronization of ovulation followed by TAI are: no estrus detection and acceptable conception rates (40 to 50%). Many reproductive programs include a presynchronization step. The advantage to presynchronization is a tightened synchrony by getting more cows and heifers in the same stage of the estrous cycle before estrous synchronization and AI or TAI. There are a variety of presynchronization methods used in cattle. One of the most common programs is two injections of PGF2[alpha] 14 d apart 12 d before initiation of Ovsynch (d 0 GnRH, 7 d, PGF2[alpha], 56 h, GnRH, 16 h, TAI) (Moreira et al., 2001). Another is double Ovsynch where the Ovsynch program is administered 7 d before another Ovsynch program (Giordano et al., 2012). Long-term progestogens can also be used as a means to presynchronize the estrous cycle and has been successful in beef cows and heifers. Long term progestogens, such as a CIDR (controlled internal drug release) for 14 d, will suppress estrus, inhibit ovulation, and induce the development of a persistent dominant follicle that can ovulate after CIDR removal (Ahmad et al., 1995; Revah and Butler, 1996; Roche et al., 1999). Ovulation of the dominant follicle allows for cows and heifers to be late in the luteal stage of the estrous cycle before PGF2[alpha] and AI or PGF2[alpha], 56 h, GnRH, 16 h, TAI. Presynchronization has shown to decrease the days to pregnancy. This is an advantage because it will directly affect the number of days a cow is not pregnant and the amount of milk she will produce in her lifetime. The objective of this research was to evaluate pregnancies per AI, ovarian follicular and luteal development of postpartum dairy cows and dairy heifers in response to long term progestin-based programs (14dCIDR) compared with PGF2[alpha]-based programs. Experiment 1 (Chapter 2) evaluated the use of a 14dCIDR-PGF2[alpha] program to a PGF2[alpha]-alone program for synchronizing dairy heifers before AI. Heifers were examined by real-time ultrasonography during treatment to assess the ovarian response. Heifers were also monitored for estrus following presynchronization and treatment of PGF2[alpha] to assess ovulation response. The 14dCIDR-PGF2[alpha] system resulted in more heifers with a larger CL at the time of PGF2[alpha]. This is ideal because of the greater luteolytic effects of PGF2[alpha] has on a more mature CL. The 14dCIDR-PGF2[alpha] heifers were AI and became pregnant sooner compared with the PGF2[alpha]-alone heifers. Experiment 2 (Chapter 3) evaluated the use of a 14dCIDR_TAI program compared with a PGF2[alpha]-based program in grazing dairy cows. The 14dCIDR_TAI program employed synchronization of ovulation before TAI and the PGF2[alpha]-based program employed synchronization of estrus with AI after observed estrus. The evaluation of reproductive efficiency for each program was examined. Cows assigned to the 14dCIDR_TAI program were AI early in the breeding season and were all AI by the end the breeding season compared with the PGF2[alpha]-based program. The PGF2[alpha]-based program had a greater first service conception rate (FSCR) compared with the 14dCIDR_TAI program but did not achieve a greater number of pregnancies after two inseminations. Experiment 3 (Chapter 4) evaluated the use of a 14dCIDR_TAI program compared with another common TAI program (Presynch-Oysynch56) in postpartum lactating dairy cows. Follicular dynamics and luteal development were monitored in both programs. Each program was evaluated for effectiveness to presynchronize the estrous cycle and establish pregnancy. The 14dCIDR_TAI and the Presynch-Ovsynch56 programs were comparable in their effectiveness to presynchronize the estrous cycle and establish pregnancy in cows that were cycling. Non-cycling cows treated with the Presynch-Ovsynch56 program had lesser conception rate compared with those that were cycling. There was no difference in conception rate with non-cycling or cycling cows treated with the 14dCIDR_TAI. Experiment 4 (Chapter 5) evaluated the use of the 14dCIDR_TAI program with or without PGF2[alpha] at CIDR removal. It is possible for cows to still have a CL after the end of the 14dCIDR treatment either due to longer estrous cycles or the cow was early in her estrous cycle when the CIDR was inserted. The addition of PGF2[alpha] may help improve the synchrony and conception rates after presynchronization of the estrous cycle before TAI. The addition of the PGF2[alpha] at CIDR removal demonstrated an increase in the number of cows that showed estrus after presynchronization but conception rates were comparable. Overall, the use of the 14dCIDR as means to presynchronize the estrous cycle has been demonstrated as an effective way to enhance the synchrony and decrease the interval to pregnancy in dairy cows and heifers.
Book Synopsis Comparison of estrus synchronization in beef cattle between use of Syncro-Mate-B with 48 hour calf removal and Lutalyse by : Luna Irene Futrell Tucker
Download or read book Comparison of estrus synchronization in beef cattle between use of Syncro-Mate-B with 48 hour calf removal and Lutalyse written by Luna Irene Futrell Tucker and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Cidr and Estrumate as Estrus Synchronization Methods by : Chad Duit
Download or read book Comparison of Cidr and Estrumate as Estrus Synchronization Methods written by Chad Duit and published by . This book was released on 2001 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
