Heat Stress and Lamness.
Data shows when lying time reduced to below 11 hours per day lameness increases. During heat stress a cows body temperature will increase if there is insuficient heat abatement
Data shows that when body temperatur reaches 39C, the cow automatically stands up. She will stand unless her body temperatur decreases trough an effective cooling. Sufficient airspeed in the lying place will increase resting time.
When standing is the norm it will eventually result in extra lameness. There is around a two month lag time from the highest THI days until lameness happens
Outcomes of heat stress
1_ decline in dry matter intake
2_ decline in milk production
3_decline in milk composition ( fat and protein
4_ lower in ruminal pH from 6 to 5.
5_ increase in lameness
6_decline in fertility
7_small calf birth weigh
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