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Author : Julia Allison Haggerty
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (833 download)
Download or read book Comparison of Two CIDR Based Estrous Synchronization Programs in Beef Heifers written by Julia Allison Haggerty and published by . This book was released on 2013 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nicole Renee Leitman
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (216 download)
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.
Author : Daniel A. Mallory
Publisher :
ISBN 13 :
Total Pages : 89 pages
Book Rating : 4.:/5 (558 download)
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.
Author : Justin Michael Nash
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (876 download)
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.
Author : Jillian Mae Abel
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (958 download)
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
Author : Morgan J. Roberts
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (117 download)
Download or read book A Comparison of Co-Synch + CIDR and ECP + CIDR as Estrus Synchronization Techniques for Timed Artificial Insemination of Beef Heifers written by Morgan J. Roberts and published by . This book was released on 2010 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted as an estrus synchronization technique comparison. The objective of this study was to compare the effectiveness of two different estrus synchronization protocols for use in beef heifers. Two CIDR based protocols were utilized in this study, Co-Synch + CIDR (progesterone, gonadotrophin releasing hormone, and prostaglandin) and ECP + CIDR (Estradiol Cypionate, progesterone, prostaglandin, and gonadotrophin releasing hormone). 65 heifers were located on the same farm, however, were separated into three groups for handling ease (Group 1=21, Group 2-23, and Group 3=21). 42 heifers (Group 1=21, Group 2=11, and Group 3=10 were synchronized using the Co-Synch + CIDR technique. Heifers were administered a 2.0 ml injection of GnRH at the time of CIDR insertion. The CIDR implants remained in the heifers for 7 days. A 5.0 ml injection of PGF was administered at the time of CIDR removal. Removal was followed by TAI 52 hours later. At the time of AI heifers received another injection of GnRH. 23 heifers (Group 2=12 and Group 3=11) received the ECP + CIDR protocol. Each heifer received a 0.5 ml injection of ECP at time of CIDR insertion. CIDR remained in heifers for 7 days. All heifers were administered a 5.0 ml shot of PGF at time of CIDR removal. 52 hours after removal, heifers were TAI and were given an injection of GnRH. Conception rates of 57.1%, 18.2 % and 60.0% were achieved with the Co-Synch + CIDR protocol after time artificial insemination. ECP + CIDR resulted in conception rates of 33.3% and 90.9% after timed artificial insemination.
Author : Quentin L. Vickers
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (246 download)
Download or read book A Comparison of Estrous Synchronization Programs for Use with Artificial Insemination in Beef Heifers written by Quentin L. Vickers and published by . This book was released on 2005 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compares the two options associated with CIDR use and the addition of ECP as an estrous response enhancement.
Author : Dallas James Wilson
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (449 download)
Download or read book Comparison of Controlled Internal Drug Release (CIDR)-based Protocols to Synchronize Estrus and Facilitate Artificial Insemination (AI) in Postpartum Beef Cows written by Dallas James Wilson and published by . This book was released on 2008 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: Artificial insemination (AI) and estrous synchronization are reproductive technologies that enable beef producers to efficiently improve herd genetics. The recent development of protocols designed to synchronize estrus and ovulation enable producers to utilize fixed-time AI (FTAI), thus reducing time and labor required to detect estrus. The 7-d Select Synch and CO-Synch + CIDR protocols provide an efficient and effective means to synchronize estrus in postpartum beef cows. Recently a 5-d Select Synch and CO-Synch + CIDR protocol was developed. To date, however, the literature is devoid of information comparing the 7-d and 5-d protocols on the basis of their practical application in the field. Experiment 1 was designed to fully characterize and compare the 7-d and 5-d Select Synch + CIDR protocols. There were no differences between treatments for estrous response, interval to estrus, or the variance for interval to estrus. Additionally, response to GnRH and follicle size at GnRH did not differ between the two treatments, nor were there any differences in synchronized conception or pregnancy rates resulting from AI. Experiment 2 was designed to compare pregnancy rates resulting from fixed-time AI following administration of the 7-d and 5-d CO-Synch + CIDR protocols with FTAI at 66 and72 h. There was no effect of treatment, technician, sire, or location on FTAI pregnancy rates. The results from these experiments indicate that the 7-d and 5-d Select Synch and CO-Synch + CIDR protocols performed comparably on the basis of synchronizing estrus and facilitating pregnancy resulting from FTAI, respectively.
Author : Neal Timothy Martin
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (876 download)
Download or read book Comparison of Long-term CIDR-based Protocols to Synchronize Estrus and Ovulation Prior to Fixed-time Artificial Insemination in Postpartum Beef Cows written by Neal Timothy Martin and published by . This book was released on 2012 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel Joseph Schafer
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.:/5 (72 download)
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:
Author : Charles J. Zickus
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (449 download)
Download or read book Estrus Synchronization Comparison of Two Programs Reliability in Beef Heifers and Cows written by Charles J. Zickus and published by . This book was released on 1996 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David J Patterson
Publisher : Elsevier Health Sciences
ISBN 13 : 032326137X
Total Pages : 210 pages
Book Rating : 4.3/5 (232 download)
Download or read book Beef Heifer Development, An Issue of Veterinary Clinics: Food Animal Practice written by David J Patterson and published by Elsevier Health Sciences. This book was released on 2013-12-28 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest information on heifer development in beef cattle for the food animal practitioner! Topics include rebuilding the US cowherd, physiology and endocrinology of puberty, nutritional development and the target weight debate, long-term reproductive health, effect of prenatal programming on development, economics of development, synchronization of estrus and ovulation, post breeding heifer management, management strategies for adding value to heifers, and more!
Author : S. Shawn Harper
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Comparison of two systems of estrus synchronization in beef heifers written by S. Shawn Harper and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian Rogers
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (71 download)
Download or read book Estrous Synchronization in Beef Heifers Using Progesterone Intravaginal Insert CIDR and a Two-injection System of Prostaglandin (ProstaMate and Progesterone-estradiol) in Conjunction with Time Breeding Regimen written by Brian Rogers and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the degree of synchrony and the rate of first service non-return to estrus achieved when using a progesterone intravaginal insert (CIDR-Pharmacia Animal Health), and a two injection system of progesterone-estradiol combination (ABS) and prostaglandin (ProstaMate- Rx Veterinarian Products) in conjunction with one 24 h timed breeding regimen. A total of 39 virgin beef heifers (N=39) of different breeds where provided by different consignors from different areas of east Texas. The heifers were developed to reach an average body score of 5.0. All heifers were assigned to a protocol that consisted of CIDR estrous synchronization and breeding via AI according to 24 h timed insemination. All heifers were equipped with an electronic HeatWatch® transmitter to aid in heat detection, and were exposed to a vasectomized Jersey bull equipped with a chin-ball marker. The degree of synchrony and the rate of first service non-return to estrus were analyzed using the general linear model procedure and least square means analysis procedures of SAS (SAS Institute, Inc. Cary, NC.) to determine if there was any significant difference for breed, average daily gain, and age at time of insemination. (Abstract shortened).
Author : Gonzalo Barquero
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (57 download)
Download or read book Synchronization of Estrus in Beef Heifers and Cows with GnRH And/or CIDR-based Protocols written by Gonzalo Barquero and published by . This book was released on 2004 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chad Duit
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (485 download)
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:
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Author : Emmett Eugene Capt
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.:/5 (54 download)
Download or read book Estrous Synchronization in Beef Heifers Using Progesterone Intravaginal Insert (CIDR), and a Two-injection System of Prostaglandin (Lutalyse®), in Conjunction with Two Breeding Regimen[s] written by Emmett Eugene Capt and published by . This book was released on 2003 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
