Luminiţa Doliş

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RESEARCH CONCERNING THE INFUENCE OF AGE AT FIRST CALVING, ON MILK PRODUCTION IN ROMANIAN BLACK AND WHITE BREED

Luminiţa Doliş, M. Doliş, I. Gîlcă, M.G. Usturoi, Roxana Teodora Stanescu (Cozmanciuc)

Abstract
This paper is part of a larger project, which aims to study the influence of growth technology, on breeding at Romanian Black and White. Thus, based on data and centralized on the age of first calving, that milk production, from a total of 155 dairy cows, was to investigate the influence of age at first calving on the lengh of first lactation and that the quantity and quality production (% fat,% protein) of milk. Results show, that herd studied is quite heterogeneous; age at first calving (AFC) being between 23 and 39 months, with an average of 29.95 months. On the lenght of first lactation in cows, it had no significant differences depending on age at first calving, instead of milk production quantitative differences were highly significant even in some cases. In terms of quality, age at first calving influenced, less milk fat content and more on the protein.

Key words: cows, milk, calving, production, lactation