Data/hora: 22/06/2024 08:15:04

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - A
Data corrente: | 09/04/2010
Data da última atualização: | 25/09/2019
Autoria: | FONSECA, J. F. da; TORRES, C. A. A.
Afiliação: | JEFERSON FERREIRA DA FONSECA, CNPC; UFV, Viçosa, MG.
Título: | Administration of hCG 5 days after breeding and reproductive performance in nulliparous dairy goats.
Ano de publicação: | 2005
Fonte/Imprenta: | Reproduction in Domestic Animals, v. 40, n. 6, p. 495-499, 2005.
DOI: | 10.1111/j.1439-0531.2005.00612.x
Idioma: | Inglês
Conteúdo: | Abstract: The objective of this study was to investigate the effect of hCG administration 5 days after breeding on plasma progesterone (P4) concentration and reproductive performance of oestrousinduced nulliparous dairy goats. A total of 59 nulliparous goats (36 Alpine and 23 Saanen) received intravaginal sponges with 60 mg medroxyprogesterone acetate for 9 days plus 200 IU equine chorionic gonadotrophin (eCG) and 22.5 lg d-cloprostenol 24 h before sponge removal. After detection of oestrus (day of oestrus ¼ day 0) and breeding, 49 females were randomly assigned, according to the breed, into two treatments (T1 and T2). In T1 (n ¼ 25) and T2 (n ¼ 24), animals received intramuscular injection of 1 ml of saline solution (control) or 250 IU hCG, respectively, 5 days after breeding. Plasma P4 concentration (ng/ml) was determined from blood sampled on days 0, 5, 7, 13, 17, 21, 28 and 45 after breeding. Animals were scanned by transrectal ultrasound (5 MHz probe) on days 35 and 70 after breeding for detection of pregnancy. Plasma P4 concentration did not differ (p > 0.05) between treatments in all days, but it was increased (p < 0.05) in Saanen than in Alpine goats from days 13 to 45. Pregnancy and parturition rates, litter size and gestation period were similar (p > 0.05) to treatments and breeds. Results of this study indicate that human chorionic gonadotrophin (hCG) administration 5 days after breeding did not significantly alter reproductive performance in dairy nulliparous goats and that plasma P4 differed between Saanen and Alpine goats.
Palavras-Chave: | Brasil; Caprino leiteiro; Estro; Goat; Gonadotropin; HCG; Induction; Oestrous cycle; Plasma progesterone concentration; Progestagen.
Thesagro: | Cabra; Ciclo estral; Eficiência reprodutiva; Endocrinologia; Indução; Progesterona; Reprodução animal.
Thesaurus Nal: | Animal reproduction; Brazil; Corpus luteum; Estrous cycle; Estrus synchronization.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (22984-1) - UPC - AP - DD - SP 06541 -  -  - DIS