Data/hora: 22/06/2024 02:09:38

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/08/1992
Data da última atualização: | 17/05/2023
Autoria: | RODRÍGUEZ IGLESIAS, R. M.; CICCIOLI, N. H.; IRAZOQUI, H.; RODRIGUEZ, B. T.
Afiliação: | R. M. RODRÍGUEZ IGLESIAS.
Título: | Importance of behavioural stimuli in raminduced ovulation in seasonally anovular corriedale ewes.
Ano de publicação: | 1991
Fonte/Imprenta: | Applied Animal Behaviour Science, v. 30, n. 3/4, p. 323-332, 1991.
DOI: | https://doi.org/10.1016/0168-1591(91)90137-M
Idioma: | Inglês
Conteúdo: | Abstract: Three groups of about 65 seasonally anovular Corriedale ewes were penned and exposed to rams on November 4, 1989. A fourth group (n=64) was maintained in a 3-ha paddock and also exposed to rams on the same date. The sexual behaviour exhibited by rams in contact with penned ewes was recorded during nine simultaneous observation sessions lasting 2 h each. Five days after ram introduction, incidence of ovulation and ovulation rate were higher (P < 0.01) in adult than in 1.5-year-old ewes. Among penned adult ewes, a greater (P < 0.05) incidence of ovulation was recorded in ewes maintained in contact with rams and oestrous ewes (95.8%) than in ewes exposed to either rams with or without recent experience with oestrous ewes (68.7 and 57.1%, respectively). The fourth group, exposed to rams in field conditions, exhibited a lower (P < 0.05) incidence of ovulation (31.9%) than any other group. No differences among treatments were detected in 1.5-year-old ewes. The incidence of ovulation was associated (r=0.99, P<0.05) with the sexual behaviour displayed by the rams. It was concluded that the sexual behaviour of the rams plays an important role in ram-induced ovulation and that the continuous presence of oestrous ewes is necessary for the maximum efficacy of the technique in Corriedale ewes.
Palavras-Chave: | Anestro; Efeito macho; Induced ovulation.
Thesagro: | Ovino; Reprodução.
Thesaurus Nal: | Ewes; Reproduction; Sexual behavior; Sheep.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (6398-1) - ADD - AP - DD -  -  -  - DIS