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Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. Repositório Alice
CAVALCANTI, A. dos S.; BRANDÃO, F. Z.; NOGUEIRA, L. A. G.; FONSECA, J. F. da.
Abstract: The objective of this study was to verify the effects of GnRH on ovulation and pregnancy of ewes subjected to a short-term synchronization of estrus. Santa Inês and crossbred Santa Inês/Dorper ewes received 60 mg MAP sponges during 6 days plus 300 IU eCG and 30 µg d-cloprostenol 24 h prior to sponge withdrawal (SW). Ewes were assigned to receive 0.9% NaCl solution (Tcontrol; n = 32) or 25 µg GnRH (licerelin, TGnRH; n = 34) 24 hours after SW. Each group was assigned to intrauterine insemination by laparoscopy (n = 25) or to natural mating (n = 41). Artificial insemination was performed with a single dose of fresh semen. For controlled mating, females were exposed to males 12, 24, 36 and 48 hours after SW. Ten females per treatment were subjected...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Raça Santa Inês; Intravaginal progesterone insert; Pregnancy rate; Ovino; Reprodução animal; Inseminação artificial; Progesterona; Sincronização do cio; Ciclo estral; Ovulação; Taxa de prenhez; Sheep; Artificial insemination; Ovulation; Progesterone; Oestrus synchronization.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/929671
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Reproductive parameters of Santa Inês ewes submitted to short-term treatment with re-used progesterone devices. Repositório Alice
PINNA, A. E.; BRANDÃO, F. Z.; CAVALCANTI, A. S.; BORGES, A. M.; SOUZA, J. M. G.; FONSECA, J. F. da..
Abstract: The aim of this study was to verify the efficacy of reusing intravaginal progesterone (P4) devices on the reproductive parameters in Santa Inês ewes. Females received intravaginal P4 devices for their first, second or third use for five days plus 300 IU eCG IM and 5mg dinoprost laterovulvar 24h before device removal. Blood was collected at different moments. Transrectal ultrasonography was performed from device removal to ovulation. Part of the ewes were submitted to artificial insemination by laparoscopy (IAL - n=55) with fresh semen, whereas the rest were bred by fertile rams (n=41). On the initial 18 h, ewes that received devices for the first time showed higher P4 concentrations (5.1±1.8 vs 3.5±1.4 vs 2.4±1.1 - P<0.05). However, after the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Dispositivo intravaginal de progesterona; Ovino; Inseminação artificial; Reprodução animal; Ovulação; Raça Santa Inês; Progesterona; Sheep; Animal reproduction; Artificial insemination; CIDR; Intravaginal progesterone insert; Ovulation.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/927326
Registros recuperados: 2
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