Use of prostaglandin F2a as ovulatory stimulus for synchronizing dairy cattle.

The aim of this study was to evaluate if prostaglandin F2α (PGF) can be used to induce ovulation in a GnRHprogesterone based protocol. In Experiment 1 crossbred dairy cows (n = 32) were synchronized with a progesterone-GnRH based protocol for seven days, where the luteolytic dose of 150 μg PGF was given 24 h prior progesterone device removal (CIDR). On Day 8 cows were separated into two groups to receive: 1) 2 mL of Saline (Control Group, n = 15) or 2) 150 μg of PGF (PGF Group, n = 17). Ovulation rate was higher in the PGF than Control group (100% vs 53.3%, P = 0.001, Odds ratio = 30.88). The percentage of cows that ovulated synchronously tended to be higher in the PGF than Control group (P = 0.1, Odds ratio = 9.6). Experiment 2 was performed in a cross-over (3 × 3) design. Crossbred dairy cows (n = 25) received a CIDR for seven days and GnRH on Day 0. Seven days later 150 μg of PGF was given and the progesterone device was removed, and 24 h later cows were distributed into three groups to receive: 1) 2 mL of Saline (Control Group, n = 25), 2) 150 μg of PGF (PGF Group, n = 25) or 3) 1 mg of ECP (ECP Group, n = 23). Diameter of ovulatory follicle was larger in the PGF and Control than ECP Group (P = 0.002, Effect size > 4.0). Synchronized ovulation rate (between 72 and 96 h after CIDR removal) tended to be higher in PGF group in Control group (P = 0.1, Odds ratio = 0.35). Results suggest that PGF is equally efficient to ECP to induce synchronized ovulation in dairy cows subjected to progesterone-GnRH based protocols.

Bibliographic Details

Main Authors:	CASTRO, N. A., NEVES, P. M. A., CESTARO, J. P., MELO, V. T. O., SCHNEIDER, A., PFEIFER, L. F. M.
Other Authors:	Natália A. Castro, UFPel; P.M.A. Neves, FIMCA; J.P. Cestaro, FIMCA; V.T.O. Melo, FIMCA; A. Schneider, UFPel; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-Rondonia.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2018-02-19
Subjects:	Estradiol cypionate, Prostaglandin, Ovulation inductor, GnRH-progesterone, Indutor de ovulação, Ovulação bovina., cattle.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1087758
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