Effect of heat stress on milk production in dairy cows
2011
Joksimović-Todorović, M., Faculty of Agriculture, Belgrade - Zemun (Serbia) | Davidović, V., Faculty of Agriculture, Belgrade - Zemun (Serbia) | Hristov, S., Faculty of Agriculture, Belgrade - Zemun (Serbia) | Stanković, B., Faculty of Agriculture, Belgrade - Zemun (Serbia)
Heat stress in dairy cows is caused by a combination of environmental factors (temperature, relative humidity, solar radiation and air movement). Continual genetic selectin for greater performance results to increased sensitivity to heat stress. It was one of the reasons why lactation curve during summer has decreasing trend compared to spring in which lactation curve maintained within high levels. The trial was conducted in spring (April-May) and summer period (June-July) on total of 40 dairy cows of Holstein-Friesian breed in early lactation period (first 60 days of lactation). Milking capacity in cows and milk chemical ingredients (milk fat and proteins) were statistically significantly higher in the spring period compared to summer, while higher values of lactose were not statistically significant. Total average milk production per cow was significantly higher in spring period (42.74 +/- 4.98l) than in summer (39.60 +/ 5.09l) at the level of P is less than 0.05. A higher rate of milk fat was recorded in spring in relation to summer period the level of significance being P is less than 0.01. The content of proteins in milk in spring period was 13% higher than in summer. The established difference was highly statistically significant (P is less than 0.001). Obtained values for percentage of lactose varied slightly (4.45 +/- 0.54% in spring versus 4.03 +/- 0.24% in summer period; P is greater than 0.05).
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