Factors influencing pregnancy per artificial insemination in repeat-breeder cows induced to ovulate with a CIDR-based protocol

The aim of this study was to determine, using multiple logistic models, factors affecting pregnancy per AI (P/AI) following fixed-time artificial insemination (FTAI) in repeat breeders cows (RBC) treated with rbST throughout lactation. 498 RBC received a CIDR device and 100μg of GnRH on day 0. CIDR...

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Veröffentlicht in:	Animal reproduction science 2012-10, Vol.134 (3-4), p.105-111
Hauptverfasser:	Mellado, M, Zuñiga, A, Veliz, F.G, de Santiago, A, Garcia, J.E, Mellado, J
Format:	Artikel
Sprache:	eng
Schlagworte:	Administration, Intravaginal Animals artificial insemination Breeding - methods Cattle - physiology Causality controlled internal drug release devices cows dairy protein Dairying Dry period erythrocytes Estrus synchronization Estrus Synchronization - methods Female gonadotropin-releasing hormone Insemination, Artificial - physiology Insemination, Artificial - veterinary Intrauterine Devices, Medicated - veterinary logit analysis milk Milk protein milk yield Ovulation Induction - methods Ovulation Induction - veterinary Parity - physiology Peak lactation Pregnancy Pregnancy Outcome - epidemiology Pregnancy Outcome - veterinary Pregnancy, Animal Progesterone - administration & dosage Reproductive performance somatotropin
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Zusammenfassung:	The aim of this study was to determine, using multiple logistic models, factors affecting pregnancy per AI (P/AI) following fixed-time artificial insemination (FTAI) in repeat breeders cows (RBC) treated with rbST throughout lactation. 498 RBC received a CIDR device and 100μg of GnRH on day 0. CIDR removal and PGF2α (25mg) treatment were done concurrently on day 7. Estradiol benzoate (EB, 1mg) was injected on day 8 and GnRH on day 9; cows were inseminated 16–20h later. Cows with an average milk protein
ISSN:	0378-4320 1873-2232
DOI:	10.1016/j.anireprosci.2012.08.001