Vliv hypotermickeho stresu na slozeni mleka a zdravotni stav krav.
1995
Broucek J. | Mihina S. | Hetenyi L. | Arave C.W. | Nakanishi Y.
Thirty Holstein cows were randomly assigned to housing treatment group. The trial group (outside) was kept in an open free stall barn and the control group (inside) in a warm enclosed tie stall barn. A significant difference of 2.68 kg in milk yield was observed throughout the whole experiment between the trial and control groups. In both groups, fat content had a similar trend. A significant improvement was recorded in the sixth week. The average fat content in dairy cows kept in the environment with lower temperatures was 0.117 kg higher than in the other type of housing. The protein content in the trial group was significantly higher in the whole experiment. Contents of lactose and solids-non-fat in percentage had a similar trend with a rapid decrease in the sixth week. Concentrations of these parameters were slightly lower in the trial group compared with control group. Somatic cell count was also higher during the whole period of observation of the trial group.
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