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Use Of Synchromate B Treatment For Estrus Synchronization In Beef Cows And Heifers And Its Subsequent Effect On Reproductive Performance
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Book Synopsis Use of Synchromate-B Treatment for Estrus Synchronization in Beef Cows and Heifers and Its Subsequent Effect on Reproductive Performance by : Johnnie Russell Vaughan
Download or read book Use of Synchromate-B Treatment for Estrus Synchronization in Beef Cows and Heifers and Its Subsequent Effect on Reproductive Performance written by Johnnie Russell Vaughan and published by . This book was released on 1977 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estrous Synchronization in Beef Heifers Using Melengesterol Acetate (MGA), Synchro-Mate B® (SMB), and a Two Injection System of Prostaglandin (Lutalyse®), in Conjunction with Two Breeding Regimens by : Jeanie Ellen Bendy
Download or read book Estrous Synchronization in Beef Heifers Using Melengesterol Acetate (MGA), Synchro-Mate B® (SMB), and a Two Injection System of Prostaglandin (Lutalyse®), in Conjunction with Two Breeding Regimens written by Jeanie Ellen Bendy and published by . This book was released on 2000 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of 6a-methyl-17a-acetoxyprogesterone on Synchronization of Estrus and Subsequent Fertility in Beef Heifers by : James Earl Tilton
Download or read book Effect of 6a-methyl-17a-acetoxyprogesterone on Synchronization of Estrus and Subsequent Fertility in Beef Heifers written by James Earl Tilton and published by . This book was released on 1969 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estrus Synchronization in Beef Heifers with Synchro-Mate B by :
Download or read book Estrus Synchronization in Beef Heifers with Synchro-Mate B written by and published by . This book was released on 1980 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Synchronization of Estrus and Artificial Insemination in Cattle by : Michael L. O'Connor
Download or read book Synchronization of Estrus and Artificial Insemination in Cattle written by Michael L. O'Connor and published by . This book was released on 1980 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : W. H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 22 (thesis year 1977) a total of 10,658 theses titles from 28 Canadian and 227 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 22 reports theses submitted in 1977, on occasion, certain universities do report theses submitted in previous years but not reported at the time.
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:
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 Synchronization of Estrus and Subsequent Conception Rates in Dairy Heifers and Rats Following Treatment with Melengestrol Acetate by : Prabir Kumar Chakraborty
Download or read book Synchronization of Estrus and Subsequent Conception Rates in Dairy Heifers and Rats Following Treatment with Melengestrol Acetate written by Prabir Kumar Chakraborty and published by . This book was released on 1970 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two experiments were conducted to study the effects of melengestrol acetate (MGA) on inhibition of estrus, post-treatment conception rates in heifers and rats, and MGA given during gestation on the reproductive performance in rats. MGA was administered orally to Holstein heifers and by subcutaneous injection to Sprague- Dawley rats. Twenty-four Holstein heifers (Experiment 1) were used in the study and each animal in the treatment group (12 heifers) received 1.0 mg. of MGA daily for 14 consecutive days. The treatment was initiated irrespective of the stage of the estrous cycle. Following withdrawal of treatment, one-half of the animals from each of the control and treatment groups were inseminated twice at the first post-treatment estrus at approximately 12-hour intervals, the other half received single inseminations. Conception rates were based on pregnancy diagnosis at 45 or more days following the last service. Estrus was inhibited during the period of treatment in all animals in the treatment group. Withdrawal of treatment resulted in an effective synchronization of estrus and ovulation, and 83.3% of the treated animals were in heat within a 48-hour period. The difference between the number of MGA treated animals showing estrus within 3-6 days following treatment withdrawal and the number of control animals in heat during the corresponding period of time, was highly significant (P
Book Synopsis Estrus Synchronization in Beef Heifers with Synchro-Mate BB by : J. Ruttle
Download or read book Estrus Synchronization in Beef Heifers with Synchro-Mate BB written by J. Ruttle and published by . This book was released on 1978 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Estrus Synchronization in Beef Heifers With Synchro-Mate B. by : Jose Alejandro Ramirez
Download or read book Estrus Synchronization in Beef Heifers With Synchro-Mate B. written by Jose Alejandro Ramirez and published by . This book was released on 1978 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 MGA for Estrus Synchronization and Improvement of Reproductive Performance in Beef Cattle by : John P. Kastelic
Download or read book MGA for Estrus Synchronization and Improvement of Reproductive Performance in Beef Cattle written by John P. Kastelic and published by . This book was released on 1995 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
