Physiological attributes as possible selection criteria for milk production 2. Plasma insulin, tri-iodothyronine and thyroxine in bulls

Autor:	W. G. Hill, R. B. Land, T. J. Osmond, C. J. M. Hinks, W. R. Carr
Rok vydání:	1981
Předmět:	medicine.medical_specialty fluids and secretions Endocrinology Tri iodothyronine animal diseases Internal medicine medicine Animal Science and Zoology Biology Plasma insulin Milk production Selection (genetic algorithm)
Zdroj:	Animal Science. 32:159-163
ISSN:	1748-748X 1357-7298
Popis:	Insulin, thyroxine and tri-iodothyronine concentrations were measured in samples of blood from 175 Friesian bulls, aged between 2 and 7 years, which were being progeny-tested for milk production. Least squares regression coefficients were estimated for these hormone levels on time of day and time after feed at sampling and age of bull. Correlations between hormone levels and Improved Contemporary Comparisons of the bull, a measure of his daughters' milk production, did not differ significantly from zero, suggesting that simple spot estimates of levels of these hormones in bulls would not supply useful predictors of daughters' production.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b8c9677d7846f3de17ef5a0248d764ae https://doi.org/10.1017/s0003356100024958 Zobrazit plný text záznamu