Differences in the secretion pattern of growth hormone and insulin-like growth factor - I in sheep of two crossbreeds after dietary protein restriction

The study was designed to evaluate the relationships between cross types of lambs and the pattern of GH and IGF-I secretion under conditions of standard and restricted protein feeding. The experiment was performed on two different cross types of female lambs: [(Merino x Romanov) x Suffolk], n=10, (M...

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Bibliographic Details
Published in:Journal of Animal and Feed Sciences 2002-01, Vol.11 (4), p.601-610
Main Authors: W¢jcik-GÆadysz A. (Polish Academy of Sciences, Jablonna (Poland). The Kielanowski Institute of Animal Physiology and Nutrition), Krejci P, Polkowska J
Format: Article
Language:English
Subjects:
AGNEAU
ALIMENTACION RACIONADA
ALIMENTATION RATIONNEE
BODY WEIGHT
BREEDS (ANIMALS)
CORDERO
CROSSBREDS
DIET
DIETA
FACTEUR DE CROISSANCE
FACTEUR DE CROISSANCE IGF
FACTOR DE CRECIMIENTO IGF
FACTORES DE CRECIMIENTO
GROWTH FACTORS
INSULIN-LIKE GROWTH FACTOR
LAMBS
METHODE STATISTIQUE
METODOS ESTADISTICOS
OVIN
OVINOS
PESO CORPORAL
POIDS CORPOREL
PRODUCTOS DEL CRUZAMIENTO
PRODUIT DE CROISEMENT
PROTEINAS
PROTEINE
PROTEINS
RACE (ANIMAL)
RAZAS (ANIMALES)
REGIME ALIMENTAIRE
RESTRICTED FEEDING
SECRECION
SECRETION
SHEEP
STATISTICAL METHODS
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Summary:The study was designed to evaluate the relationships between cross types of lambs and the pattern of GH and IGF-I secretion under conditions of standard and restricted protein feeding. The experiment was performed on two different cross types of female lambs: [(Merino x Romanov) x Suffolk], n=10, (MxR) and [(Merino x Finn) x Suffolk], n=9, (MxF). Lambs of both cross types were divided into two groups and fed on two isoenergetic diets, but containing different protein levels, for 16 weeks, starting at 6 months of age. At the end of the experimental feeding blood samples were taken over a period of 6 hours at 10-min intervals. The concentrations of GH and IGF-I were estimated by a radioimmunological method, the parameters of GH release pulsatility were calculated using the Pulsar computer program
ISSN:1230-1388
DOI:10.22358/jafs/67915/2002