THE EFFECT OF SOME FACTORS ON THE MILK MAIN COMPONENTS

Abstract

The paper emphasizes the results of the research performed on 317 Romanian
Spotted cows from six private exploitations located in the central part of the
country. The main qualitative and quantitative traits of the milk production, season
and familial structures (half sisters by father) effect were recorded in dynamics by
four lactations on the above mentioned population. The research concerning the
evolution of some traits of the quantitative and qualitative milk production in
dynamics by lactation reveals many aspects, which in all cases equally reflects both
the genetic potential of the biological material that can be expressed and putting
into practice of the rearing and exploitation technologies. Concerning the
quantitative milk production, by normal and total lactation an almost plane curve is
described (Table 1, Figure 1). This aspect was also reported for the collecting areas
and farms (Tables 2 and 3). Concerning the season effect, it is observed function of
the adopted technology of exploitation, that for effectives is significantly observed
only in summer (Table 4). In last part of the paper, the main traits of the milk
production in 16 familial structures of primiparous half sisters by father, classified
function of the quantity of fat and protein yield by normal lactation are emphasized
(Table 5). The obtained results are concluding.