R.I. NeamŢ

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RESEARCH REGARDING THE THERMAL STRESS ON MILK PRODUCTION IN ROMANIAN SPOTTED CATTLE FROM RESEARCH AND DEVELOPMENT STATION FOR BOVINE ARAD

R.I. Neamţ, L.T. Czister, Daniela Elena Ilie, L.I. Costin, Fl.C. Neciu, Gh. Săplăcan

Abstract
The aims of the paper was to establish the influence of environment on milk production. Research were carried out on 98 cows Romanian Spotted from Research and Development Station for Bovine Arad. Studied animals calved in the first tree months of 2011 (January, February and March), and lactations were completed at data processing time. Parameters included in the study were: total milk production, average daily milk production, milk production of each calendar month, morning and evening milk weight from total daily milking weight. The study show that both monthly milk production and morning and evening milk weight from total daily milking weight, are strongly influenced by the temperature comfort of the animals. Thus, in the months with low temperatures (December-February) average daily production is lower (10-14 l / day) than in warmer months (June to August), when average is 20-22 l / day. Even if milk average productions increase in warmer months, the weight of both milks from total daily milks weight, highly ranging. Those, observe a higher weight of morning milk (54-55% of total) compared to the evening weight milking (44-45% of total). In months with temperatures near to the thermal comfort (March to May, September to November) milking weight tends to equalize.

Key words: milk production, termic stress