Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.11/1826
Título: Effects of bovine somatotrophin (bST) on ovarian function in post-partum beef cows
Autor: Andrade, L.P.
Rhind, S.M.
Wright, I.A.
McMillen, S.R.
Goddard, P.J.
Bramley, T.A.
Palavras-chave: Beef cattle
Ovarian function
Data: 1996
Editora: CSIRO
Citação: ANDRADE, L.P. [et al.] (1996) - Effects of bovine somatotrophin (bST) on ovarian function in post-partum beef cows. Reproduction, Fertility and Development. 8:6, p. 951-960.
Resumo: The effects of bovine somatotrophin (bST) on ovarian follicle development and function and associated gonadotrophin profiles during the first nine weeks post partum were investigated in beef cows. Thirty-two cows (Shorthorn x Galloway) in moderately low body condition (BC) at calving were fed to maintain BC thereafter. At Weeks 2, 4, 6 and 8 post partum, animals were injected with 320 mg bovine somatotrophin (bST) (T, treated; n = 17) or with the carrier oil only (C, control; n = 15). Ovulation occurred in 4 of 17 T cows and 0 of 15 C cows (P = 0.10) by nine week post partum. Treatment with bST did not affect the numbers of small (3-8 mm in diameter) or large (> 8 mm in diameter) follicles or the granulosa cell populations but enhanced the oestradiol (P < 0.05) and insulin-like growth factor-I (IGF-I) content (P < 0.01) of large follicles by nine weeks post partum. It did not significantly affect the testosterone concentrations of large follicles. Circulating concentrations of growth hormone (GH) and IGF-I were higher in T cows than in C cows (P < 0.001) but were unrelated to gonadotrophin profiles or gonadotrophin receptor concentrations in the follicles. At Week 8, plasma insulin concentrations were higher in T cows than in C cows both before (P < 0.05) and after (P < 0.05) glucose injection. It is concluded that GH may play an important role in mediating the effects of nutritional state on ovarian function during the post-partum period, possibly through alteration of intrafollicular IGF-I concentrations.
Descrição: Full text not available. Only the abstract. DOI: 10.1071/RD9960951
Peer review: yes
URI: http://hdl.handle.net/10400.11/1826
Versão do Editor: http://www.publish.csiro.au/paper/RD9960951
Aparece nas colecções:ESACB - Artigos em revistas com arbitragem científica

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