Data/hora: 02/06/2024 09:26:46

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/02/2016
Data da última atualização: | 01/02/2016
Autoria: | ARMSTRONG, D. T.; WARNES, G. M.; PFITNER, A. P.
Título: | Superovulation and embryo transfer in Angora goats.
Ano de publicação: | 1982
Fonte/Imprenta: | In: INTERNATIONAL CONFERENCE ON GOAT PRODUCTION AND DISEASE, 3., 1982, Tucson. Proceedings... Scottsdale: Dairy Goat Journal, 1982. p. 339.
ISBN: | 0930848179
Idioma: | Inglês
Conteúdo: | We have investigated ovarian responses in 24 goats to gonadotropin treatments, to determine optimum procedures for superovulation and embryo transfer in Angora goats. Superovulation with PMSG (1000-1250 IU) resulted in a mean ovulation rate of 10.1. Pre-treatment with intravaginal progestin-releasing sponges (medroxyprogesterone acetate, 60 mg) as a means of regulating time of ovulation did not significantly affect ovulation rate, although it decreased the number of excess follicles which developed but failed to ovulate, and attenuated the prolonged peri-ovulatory elevation of estrogen secretion characteristic of superovulation with PMSG. A porcine pituitary FSH preparation significantly increased (P less than 0.01) mean ovulation rate to 17.3, and caused a significantly lower maximal plasma estrogen level which was of shorter duration. In a larger series of 74 angoras, in which embryos were recovered 2-4 days after the onset of the heat and transferred to synchronized recipients, FSH treatment proved somewhat superior to PMSG both in mean number of viable embryos recovered (11.1 vs 7.3) and mean number of kids born per donor treatment (7.7 vs 4.7). Irrespective of gonadotropin treatment used, a wide range in ovulation rates was observed, and number of kids born to donors was significantly correlated with ovulation rate (R equal 0.82, P less than 0.001). Embryo survival was significantly greater when a single embryo was transferred to each recipient. Survival was also positively correlated with the number of corpora lutea on the ovaries of recipients
Thesagro: | Caprino; Reprodução animal; Superovulação; Transferência de embrião.
Thesaurus Nal: | Animal reproduction; Canada; Embryo transfer; Goats; Superovulation.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (29896-1) - ADD - PL - PP - 636.39 - I61p - 2006.02863 - DIS