Effect Of Heat Stress On Lying Time In Tie-Stall Holstein Dairy Cows

Abstract

As temperatures around the globe increase and the demand for dairy products increase, heat stress management has become a priority in dairy herd management. Since the majority of dairies in the U.S. are open dry lots with a barn or shed, little research has been done on tiestall dairies and how heat stress effects cows in such operations. In this study, I attempted to document how multiparous lactating Holsteins responded to heat stress in terms of changes in lying time. The results were not statistically significant, with the average lying time during the thermoneutral period being 8.1 ± 3.004 hours and 8.7 ± 4.032 hours during the heat stress period. Finally, during the recovery period was 11.5 ± 5.807 hours. More precise measurement techniques would help in further research.