Beef cattle in feedlots subject to heat stress can experience reduced health and a
reduction in Reduced milk production due to heat stress is attributable only partly to
decrease in feed intake. Actually 35 % of reduced milk production is due to
decreased feed intake while remaining 65 % is attributable to direct effect of heat
stress. Other factors resulting reduced milk production during heat stress are
decreased nutrient absorption, the effect in rumen function and hormonal status and
increased maintenance requirement resulting reduced net energy supply for
production.
Milk production in cow has been found to be reduced when ambient temperature
and temperature, humidity index increases above critical threshold. Heat stress
during 60 days prepartum period negatively affects postpartum milk production and
cows perpetrated during summer produce less milk as compared to other season.
Similarly, the quantity of milk protein and solid not fat (SNF) have been found to be
reduced during heat stress in dairy cattle. Mallonee reported 20 % less milk yield in
cattle kept in sun than milk yield in cattle kept in shed. Similarly, Roman-Ponce
found 10.7 % higher milk production in cows kept in shed than that in cows kept in
the sun during hot weather.
6 Milk Federations and Whether Study Department
The important key strategy where all farmers can adapt to the dairy development
which intern helps industry with the help of milk federations and these federations
has to establish whether stations to guide farmers.
Shelter from the sun provided for cattle at a feedlot
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K. Sreenivasaiah