Seasonal changes of fat content of milk of Black-and-White cows
2000
Krastev, K. | Gaydarska, V. | Yanchev, I. (Institute of Animal Breeding, Kostinbrod (Bulgaria))
The effect of abiotic ecological factors by season on fat content of milk of clinicalally healthy cows for a normal 305-day lactation was studied.It was established that the biological regularity of milk fat content increase at the end of the lactation period is directly influenced by the season of the year, which is a sum ecologycal factor.When lactation is coming to an end in autumn and winter, this regularity is enhanced by the effect of low temperature and increased humidity.On the contry, cows with the second half of lactation in spring and summer show that the biological regularity is inhibited and fat content is either maintained or decreasing under the influence of higher temperarure and low humidity of the production environment.
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