Responses of sheep to annual cycles in nutrition. 2. Effects of diet and endogenous growth hormone during replenishment

Autor:	N.R. Adams, R. D. G. Rigby, M. R. Sanders, J. R. Briegel, D. W. Peter
Rok vydání:	1996
Předmět:	medicine.medical_specialty geography geography.geographical_feature_category Insulin medicine.medical_treatment Growth factor Live weight Endogeny Biology Pasture Prolactin Animal science Endocrinology Fish meal Internal medicine medicine Animal Science and Zoology Hormone
Zdroj:	Animal Science. 62:287-292
ISSN:	1748-748X 1357-7298
DOI:	10.1017/s1357729800014594
Popis:	The rôle of growth hormone (GH) in normal growth is well established, but its rôle during recovery after live-weight loss in adults is less defined. This study examined the interaction of endogenous GH with energy or protein supplements during re-feeding of ewes in low body condition. Control ewes and ewes immunized against growth hormone-releasing hormone were housed in individual pens and given food below maintenance for 107 days, before re-feeding was initiated by supplementing half of each group with either fish meal or barley for 28 days (P1), after which the supplements were switched for a further 28 days (P2). Following supplementation, the ewes grazed abundant green pasture for 92 days before slaughter. Immunization reduced plasma concentrations of GH, insulin, insulin-like growth factor 1 (IGF-1) and prolactin. Production responses to the two food supplements were similar in the control and immunized ewes, but when grazed at pasture immunized ewes gained live weight more slowly (P = 0·06), grew less wool (P
Databáze:	OpenAIRE
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