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Synchronization Of Estrus And Ovulation In Lactating Dairy Cattle Before Insemination By Appointment Or Detected Estrus
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Book Synopsis Synchronization of Estrus and Ovulation in Lactating Dairy Cattle Before Insemination by Appointment Or Detected Estrus by : Joshua Allen Cartmill
Download or read book Synchronization of Estrus and Ovulation in Lactating Dairy Cattle Before Insemination by Appointment Or Detected Estrus written by Joshua Allen Cartmill and published by . This book was released on 1999 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Synchronization of Ovulation in Dairy Cattle by : James Richard Pursley
Download or read book Synchronization of Ovulation in Dairy Cattle written by James Richard Pursley and published by . This book was released on 1996 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Timed Artificial Insemination with Estradiol Cypionate Or Insemination at Detected Estrus in High-producing Dairy Cows by : Ronaldo Luis Aoki Cerri
Download or read book Timed Artificial Insemination with Estradiol Cypionate Or Insemination at Detected Estrus in High-producing Dairy Cows written by Ronaldo Luis Aoki Cerri and published by . This book was released on 2004 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Hormonal Protocals for Synchronization of Ovulation and Timed Artificial Insemination in Dairy Heifers by : Humberto Rivera
Download or read book Development of Hormonal Protocals for Synchronization of Ovulation and Timed Artificial Insemination in Dairy Heifers written by Humberto Rivera and published by . This book was released on 2004 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manipulating Follicle and Corpus Luteum Function to Improve Efficiency of Synchronizaton of Ovulaton in Lactating Dairy Cattle by : Michael W. Peters
Download or read book Manipulating Follicle and Corpus Luteum Function to Improve Efficiency of Synchronizaton of Ovulaton in Lactating Dairy Cattle written by Michael W. Peters and published by . This book was released on 2000 with total page 136 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 Optimizing a Timed Artificial Insemination Protocol in Lactating Dairy Cows by : Denise Joanne Brusveen
Download or read book Optimizing a Timed Artificial Insemination Protocol in Lactating Dairy Cows written by Denise Joanne Brusveen and published by . This book was released on 2007 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Time of AI and Supplemental Estradiol on Reproduction of Lactating Dairy Cows by : Juliana Hillegass
Download or read book Effect of Time of AI and Supplemental Estradiol on Reproduction of Lactating Dairy Cows written by Juliana Hillegass and published by . This book was released on 2006 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estrous Synchronization by : Alan Jeff Pomerantz
Download or read book Estrous Synchronization written by Alan Jeff Pomerantz and published by . This book was released on 1984 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fertility After Timed Artific[i]al Insemination in Response to a Controlled Internal Drug Release (CIDR) Insert in Lactating Dairy Cows by : Cynthia Ann Martel
Download or read book Fertility After Timed Artific[i]al Insemination in Response to a Controlled Internal Drug Release (CIDR) Insert in Lactating Dairy Cows written by Cynthia Ann Martel and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lactating dairy cows from 2 Kansas farms were used to determine the effectiveness of exogenous progesterone in the form of an intravaginal insert (controlled internal drug release; CIDR) in conjunction with an ovulation-synchronization protocol. Cows were enrolled in a Presynch + Ovsynch protocol after parturition, where they received 2 injections of PGF[subscript]2[alpha], 14 d apart (Presynch) beginning between 30 and 36 DIM. Cows (n = 155) detected in estrus after the second PGF[subscript]2[alpha] injection of Presynch were inseminated (early AI). Remaining cows were assigned randomly to be treated with the Cosynch-72 protocol (GnRH 12 d after last Presynch PGF[subscript]2[alpha] injection, PGF[subscript]2[alpha] 7 d after GnRH, and timed AI + GnRH injection 72 h later) and served as controls (n = 159), or to be treated with the Cosynch-72 protocol and receive a progesterone insert (Ovsynch + CIDR; n = 175) for 7 d between GnRH and PGF[subscript]2[alpha]. Blood was collected at d -22 and -10 (relative to TAI at d 0) to determine cycling status based on progesterone concentrations and again at d 11 post AI to determine luteal competency. Treated cows were assigned body condition scores (BCS) on d -22 and -10. Pregnancy status was confirmed by palpation of the uterus per rectum and its contents on d 38 post-timed AI and verified again 4 wk later. Treatment with the progesterone insert increased timed AI pregnancies per AI in Cosynch- 72 + CIDR-treated cows when compared with controls (38 vs. 24%), but did not differ from early AI cows (38%). Pregnancy loss was numerically less in progesterone-treated cows than in controls (4.4 vs. 11.8%). Our study shows that increased pregnancies per AI can be achieved by the use of a progesterone insert in a reduced population of cows not yet inseminated, but treated with a progesterone insert.
Book Synopsis Heat Detection and Timing of Insemination for Cattle by : Michael L. O'Connor (Ph.D.)
Download or read book Heat Detection and Timing of Insemination for Cattle written by Michael L. O'Connor (Ph.D.) and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time of Insemination and Conception Rate in Dairy Cattle by : George Robert Barrett
Download or read book Time of Insemination and Conception Rate in Dairy Cattle written by George Robert Barrett and published by . This book was released on 1948 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Breeding Efficiency in Dairy Cattle from Artificial Insemination at Various Intervals Before and After Ovulation by : George W. Trimberger
Download or read book Breeding Efficiency in Dairy Cattle from Artificial Insemination at Various Intervals Before and After Ovulation written by George W. Trimberger and published by . This book was released on 1948 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of an Ear-attached Sensor for the Characterization and Detection of Estrus Events in Dairy Cattle by : Ellen Marie Schilkowsky
Download or read book Evaluation of an Ear-attached Sensor for the Characterization and Detection of Estrus Events in Dairy Cattle written by Ellen Marie Schilkowsky and published by . This book was released on 2020 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to evaluate the ability of a commercially available automated estrus detection (AED) system to detect cows in estrus. Estrus was synchronized in lactating dairy cows (n = 216) fitted with an ear-attached sensor that generated estrus alerts based on a combination of physical activity and rumination time data. For seven days after induction of luteolysis, cows were monitored for estrus behaviors using a combination of visual observation and automated monitoring of standing events. Ovulation time was determined via transrectal ultrasonography. The sensitivity, specificity, negative predictive value, positive predictive value and balanced accuracy of the AED system estrus alerts compared with the reference test were 92%, 69%, 53%, 96%, and 80%, respectively. Average alert duration was 13.5 h and interval from alert generation to ovulation was 23.8 h. Parity, milk production level, and circulating progesterone concentrations before estrus were all associated with significant changes in estrus expression.
Book Synopsis The Detection of Estrus in Dairy Cattle by Monitoring Behavioral Change in Stanchion Barn and Free Stall Housing by : Arun Purushottam Phatak
Download or read book The Detection of Estrus in Dairy Cattle by Monitoring Behavioral Change in Stanchion Barn and Free Stall Housing written by Arun Purushottam Phatak and published by . This book was released on 1982 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Bovine Estrous Cycle by : Tom Roger Troxel
Download or read book The Bovine Estrous Cycle written by Tom Roger Troxel and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: