Keep cows cool to keep yields up

摘要

Heat induces lethargy in dairy cows, which results in reduced feeding time and reduced dry matter intake (DMI). For every 1kg reduction in DMI, milk yield is reduced by two litres, so taking steps to counter heat stress pays its way. Excess heat triggers a drop in milk yield and butterfat percentage and can cause infertility and early embryo death. Immune systems come under pressure, leading to mastitis and high cell counts. Last year also saw reports of IBR and BVD breakdowns, even in vaccinated herds, caused by high temperatures.