Please use this identifier to cite or link to this item: http://hdl.handle.net/11452/24724
Title: Presynchronization with Double-Ovsynch improves fertility at first postpartum artificial insemination in lactating dairy cows
Authors: Herlihy, Mary M.
Giordano, Julio O.
Souza, Alex H.
Ayres, Henderson
Ferreira, Roberta M.
Nascimento, Anibal B.
Guenther, Jerry N.
Gaska, Jerry M.
Kacuba, S. J.
Crowe, Mark A.
Butler, Stephen T.
Wiltbank, Milo C.
Uludağ Üniversitesi/Veteriner Fakültesi/Doğum ve Jinekoloji Ana Bilim Dalı.
Keskin, Abdulkadir
AAH-3831-2021
24473229800
Keywords: Agriculture
Food science & technology
Presynchronization
Ovsynch
Dairy cow
Pregnancy rate
Body condition
Reproductive-performance
Ovulatory follicle
Hormone injection
Pregnancy rates
Milk-production
Risk-factors
Synchronization
Animalia
Bos
Issue Date: Dec-2012
Publisher: Elsevier Science
Citation: Herlihy, M. M. vd. (2012). "Presynchronization with Double-Ovsynch improves fertility at first postpartum artificial insemination in lactating dairy cows". Journal of Dairy Science, 95(12), 7003-7014.
Abstract: The objective of this study was to compare circulating progesterone (P4) profiles and pregnancies per AT (P/AI) in lactating dairy cows bred by timed artificial insemination (TAT) following Ovsynch-56 after 2 different presynchronization protocols: Double-Ovsynch (DO) or Presynch-Ovsynch (PS). Our main hypothesis was that DO would increase fertility in primiparous cows, but not in multiparous cows. Within each herd (n = 3), lactating dairy cows (n = 1,687; 778 primiparous, 909 multiparous) were randomly assigned to DO [n = 837; GnRH-7d-PGF(2 alpha)-3d-GnRH-7d-Ovsynch-56 (GnRH-7d-PGF(2 alpha)-56h-GnRH-16hTAI)] or PS (n = 850; PGF(2 alpha)-14d-PGF(2 alpha)-12d-Ovsynch-56). In 1 herd, concentrations of P4 were determined at the first GnRH (GnRH1) of Ovsynch-56 and at d 11 after TAI (n = 739). In all herds, pregnancy was diagnosed by palpation per rectum at 39 d. In 1 herd, the incidence of late embryo loss was determined at 74 d, and data were available on P/AI at the subsequent second service. Presynchronization with DO reduced the percentage of animals with low P4 concentrations (<0.50 ng/mL) at GnRH1 of Ovsynch-56 (5.4 VS. 25.3%, DO vs. PS). A lesser percentage of both primiparous and multiparous cows treated with DO had low P4 concentrations at GnRH1 of Ovsynch-56 (3.3 vs. 19.7%, DO vs. PS primiparous; and 8.8 vs. 31.9%, DO vs. PS multiparous). Presynchronization with DO improved P/AI at the first postpartum service (46.3 vs. 38.2%, DO vs. PS). Statistically, a fertility improvement could be detected for primiparous cows treated with DO (52.5 vs. 42.3%, DO vs. PS, primiparous), but only a tendency could be detected in multiparous cows (40.3 vs. 34.3%, DO vs. PS, multiparous), consistent with our original hypothesis. Presynchronization treatment had no effect on the incidence of late embryo loss after first service (8.5 vs. 5.5%, DO vs. PS). A lower body condition score increased the percentage of cows with low P4 at GnRH1 of Ovsynch-56 and reduced fertility to the TAI. In addition, P4 concentration at d 11 after TAI was reduced by DO. The method of presynchronization at first service had no effect on P/AI at the subsequent second service (34.7 vs. 36.5%, DO vs. PS). Thus; presynchronization with DO induced cyclicity in most anovular cows and improved fertility compared with PS, suggesting that DO could be a useful reproductive management protocol for synchronizing first service in commercial dairy herds.
URI: https://doi.org/10.3168/jds.2011-5260
https://www.sciencedirect.com/science/article/pii/S0022030212007047
http://hdl.handle.net/11452/24724
ISSN: 0022-0302
1525-3198
Appears in Collections:Scopus
Web of Science

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