STUDY REGARDING THE INFLUENCE OF PARITY ON MILK PRODUCTION TRAITS IN ROMANIAN BLACK AND WHITE COWS
Keywords:
parity, lactation length, Romanian Black and WhiteAbstract
The aim of this paper was to establish the way parity had an influence on the milk
production and lactation length in Romanian Black and White cows from the
Didactical Farm Timişoara. The influence of the parity on the milk production and
lactation length was studied on 125 lactations (37 first lactations, 23 second
lactations, 29 third lactations, 14 fourth lactations, and 22 fifth and over lactations).
The longest lactation was found in the second parity (397.9 days) and the shortest in
the 5+ parity (353.3 days). The maximum milk yield per total lactation was attained
in the third lactation (5705.4 kg) and the minimum milk yield in the first lactation
(4652.6 kg). Variability for this trait was higher in second lactation (20.74%). The
lowest variability coefficient was found in the third lactation (v%=15.36%)
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