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Insulin-like growth factor and growth hormone receptor in postpartum lactating beef cows PAB
Schneider,Augusto; Pfeifer,Luiz Francisco Machado; Hax,Lucas Teixeira; Paludo,Giane Regina; Pino,Francisco Augusto Burkert Del; Dionello,Nelson José Laurino; Corrêa,Marcio Nunes.
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bos indicus; Bos taurus; GHR; IGF-I; MRNA hepatic expression; Ovulation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000800019
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