Hormones and metabolites in blood of juvenile cattle in relation to different genetic merit for milk yield
1995
Tancin, V. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovakia). Ustav Technologie a Ekonomiky Chovu Zvierat) | Garssen, J.G.
The possibility of assessing the genetic merit of dairy cattle during the early period of their life on the basis of metabolic processes seems to be intensively studied at present. It was observed that insulin characteristics, especially pancreas sensitivity in response to challengers (particularly glucose) and peripheral tissue sensitivity to insulin directed glucose uptake, have a predicting value for milk yield in adults. Positive relations were found between kinetic parameters of thyroid hormones (degradation rate of thyroxine) and milk production, but only a few reports have been published up to now. With regard to metabolic parameters in the blood of young animals the levels of urea, glucose and non-esterified fatty acids (NEFA) are interesting in relation to genetic merits for milk yield, though results are often contradictory probably as a result of age, sex and above all animal nutrition before and during the experiment. It seems that more trials must be performed for a better understanding of the reasons for a modulated metabolic regulation in young animals in relation to their genetic merit.
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