Gálik Roman, Lüttmerding Gabriel, Boďo Štefan, Knížková Ivana, Kunc Petr
Institute of Agricultural Engineering, Transport and Bioenergetics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia.
Livestock Technology and Management, Institute of Animal Science, Přátelství 815, Uhříněves, 104 00 Praha, Czech Republic.
Animals (Basel). 2021 Oct 30;11(11):3114. doi: 10.3390/ani11113114.
The values of the temperature-humidity index and its influence on the performance parameters of dairy cows were monitored on four farms located in the southern part of the central Slovakia during a period of three years. The observed parameters included: the milk yield per cow per day, average milk speed and maximum milk speed. The thermal-humidity index was calculated based on a formula. The individual periods were divided according to the achieved THI. The results of dairy cows with a milk yield of 29 kg to 31 kg show that there is not a decrease in the milk yield per milking if the THI value is lower than 68. It was also found that there was a decrease in the milk yield per dairy cow in the robotic milking parlor for a THI value greater than 72. The influence of a THI value higher than 68 in these dairy cows results in a higher average milk speed, as well as a higher maximum milk speed. These two parameters are not yet in the main area of research interest. This study enriches the area with new knowledge, according to which dairy cows can show thermal stress by increasing the milk speed as well as the maximum milk speed.
在三年时间里，对位于斯洛伐克中部南部的四个农场的温湿度指数值及其对奶牛生产性能参数的影响进行了监测。观测参数包括：每头奶牛每天的产奶量、平均挤奶速度和最大挤奶速度。温湿度指数根据公式计算得出。各个时期根据所达到的温湿度指数进行划分。产奶量为29公斤至31公斤的奶牛的结果表明，如果温湿度指数值低于68，每次挤奶的产奶量不会下降。还发现，对于温湿度指数值大于72的情况，机器人挤奶厅中每头奶牛的产奶量会下降。温湿度指数值高于68对这些奶牛的影响导致平均挤奶速度以及最大挤奶速度更高。这两个参数尚未成为主要的研究兴趣领域。本研究用新知识丰富了该领域，据此奶牛可通过提高挤奶速度以及最大挤奶速度来表现出热应激。
