Data/hora: 19/06/2024 12:07:15

Biblioteca(s): | Embrapa Rondônia.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 1
Data corrente: | 19/02/2018
Data da última atualização: | 18/09/2018
Autoria: | CASTRO, N. A.; NEVES, P. M. A.; CESTARO, J. P.; MELO, V. T. O.; SCHNEIDER, A.; PFEIFER, L. F. M.
Afiliação: | 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.
Título: | Use of prostaglandin F2a as ovulatory stimulus for synchronizing dairy cattle.
Ano de publicação: | 2018
Fonte/Imprenta: | Research in Veterinary Science, v. 118, p. 151-154, 2018.
Idioma: | Inglês
Conteúdo: | The aim of this study was to evaluate if prostaglandin F2&#945; (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 &#956;g 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 &#956;g 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 &#956;g 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 &#956;g 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.
Palavras-Chave: | Estradiol cypionate; GnRH-progesterone; Indutor de ovulação; Ovulação bovina; Ovulation inductor; Prostaglandin.
Thesaurus Nal: | cattle.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/172750/1/Useof-Castro.pdf
Registro original: | Embrapa Rondônia (CPAF-RO)
Exemplares: | CPAF-RO - (17995-1) - UPC - AP - DD -  -  -  - DIS