Thermal comfort zoning and its impact on dairy production in Rio Grande do Sul state, Southern Brazil

G. Pauletti, W. Silvestre
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Abstract

Thermal comfort is one of the main factors that influence the productivity of dairy cattle. The temperature-humidity index (THI) is one of the most used indicators to evaluate thermal comfort levels. This work aimed to evaluate the levels of thermal comfort for bovine dairy production in Rio Grande do Sul state through the THI calculation and its impact on milk production, considering daily yields of 15 kg and 30 kg per cow. The THI values and decrease in milk yield were calculated using data between 1990 and 2021 from the National Institute of Meteorology (INMET). The observed results considering the average temperatures showed that conditions of thermal discomfort occur only in summer, intensifying in January. Milk production was most affected in the western border region of the state, corresponding in parts to the physiographic regions of Alto Uruguai, Missões, and Campanha, which have a warmer climate. The climate classification proposed by Maluf had the best spatial correspondence with the ITU. This classification may be used in the evaluation of places with greater suitability for dairy farming in the state and to indicate places where it is necessary to implement action to mitigate the effects of thermal discomfort in dairy cattle.
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巴西南部南里奥格兰德州的热舒适分区及其对乳制品生产的影响
热舒适性是影响奶牛生产性能的主要因素之一。温湿度指数(THI)是评估热舒适度水平最常用的指标之一。这项工作旨在通过THI计算评估南里奥格兰德州奶牛生产的热舒适水平及其对牛奶生产的影响,考虑到每头牛的日产量为15公斤和30公斤。THI值和产奶量的下降是使用美国国家气象研究所(INMET)1990年至2021年间的数据计算的。考虑到平均温度的观察结果表明,热不适只在夏天发生,在一月份加剧。该州西部边境地区的牛奶生产受到的影响最大,部分地区与气候变暖的上乌拉圭、米斯和坎帕尼亚的自然地理区域相对应。马鲁夫提出的气候分类与国际电联的空间对应性最好。该分类可用于评估该州更适合奶牛养殖的地方,并指出有必要采取行动减轻奶牛热不适影响的地方。
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发文量
12
审稿时长
25 weeks
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