Data/hora: 01/06/2024 07:32:32

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 19/11/2003
Data da última atualização: | 28/08/2023
Autoria: | HUSEIN, M. Q.; BAILEY, M. T.; ABABNEH, M. M.; ROMANO, J. E.; CRABO, B. G.; WHEATON, J. E.
Título: | Effect of eCG the pregnancy rate of ewes transcervically inseminated with frozen-thawed semen outside the breeding season.
Ano de publicação: | 1998
Fonte/Imprenta: | Theriogenology, v. 49, n. 5, p. 997-1005, Apr. 1998.
DOI: | 10.1016/s0093-691x(98)00048-x.
Idioma: | Inglês
Conteúdo: | Abstract: An experiment was conducted to determine whether factors affecting pregnancy rate out-of-season are associated more with transcervical artificial insemination (T-AI) procedures or with the reproductive state of the ewe. Twenty Finncross ewes were treated with progesterone sponges, and at sponge removal (0 h) 10 ewes were treated with eCG. Blood samples were collected for LH and progesterone analyses, and follicular development was monitored using ultrasonography. Ewes were inseminated from 48 to 52 h with 200 million motile frozen-thawed spermatozoa. The incidence of estrus, LH surges and ovulation was greater (P < 0.01) and intervals to these responses were shorter (P < 0.01) in the eCG-treated ewes. The number of follicles > 5 mm was higher (P < 0.05) in eCG-treated than control ewes. Progesterone concentrations increased and remained elevated through Day 19 in 7 eCG-treated and in 1 control ewe, and these ewes were pregnant based upon ultrasonographic examination. The results demonstrate that the T-AI technique using frozen-thawed semen produces a relatively high (70%) pregnancy rate out-of-season. The pregnancy rate was found to reflect primarily the reproductive condition of the ewe.
Palavras-Chave: | Drug effects; eCG; Ovulation Induction; Semen Preservation.
Thesaurus Nal: | Chorionic gonadotropins; Luteinizing hormone; Ovarian follicles; Pharmacology; Pregnancy; Progesterone; Reproduction; Seasons; Sheep; Sperm motility; Spermatozoa; Ultrasonography.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (16419-1) - ADD - AP - DD -  -  -  - DIS