Data/hora: 17/06/2024 13:03:24

Provedor de dados: | 86
País: | Brazil
Título: | Insulin-like growth factor and growth hormone receptor in postpartum lactating beef cows
Autores: | Schneider,Augusto; Pfeifer,Luiz Francisco Machado; Hax,Lucas Teixeira; Paludo,Giane Regina; Pino,Francisco Augusto Burkert Del; Dionello,Nelson José Laurino; Corrêa,Marcio Nunes.
Data: | 2010-08-01
Ano: | 2010
Palavras-chave: | Bos indicus; Bos taurus; GHR; IGF-I; MRNA hepatic expression; Ovulation.
Resumo: | The objective of this study was to evaluate the plasma concentrations of insulin-like growth factor-I (IGF-I), and the mRNA hepatic expression of IGF-I and of the growth hormone receptors GHR and GHR 1A, in postpartum beef cows. Four Angus and four crossbred (Angus x Nelore) postpartum suckled beef cows were used. Liver and blood samples were collected every 10 days, from calving to 40 days postpartum, for gene expression and for β-hydroxybutyrate and IGF-I assays, respectively. Samples for progesterone assay were collected every other day, from day 10 to 40 postpartum. Three cows ovulated before 40 days postpartum. IGF-I concentration was higher in Angus x Nelore than in Angus cows. There was no difference in the expression of GHR, GHR 1A and IGF-I according to breed or ovulatory status. IGF-I concentrations were higher in crossbred cows, but have not changed according to postpartum ovulatory status. Moreover, changes in postpartum IGF-I concentrations are not associated with changes in liver GHR, GHR 1A and IGF-I mRNA expression in either breed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000800019

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2010000800019
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.45 n.8 2010
Fonte: | info:eu-repo/semantics/openAccess