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Relationships between heat stress and metabolic and milk parameters in dairy cows in southern Brazil

机译：巴西南部奶牛热应激与代谢和乳汁参数之间的关系

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This study approached the relationships between heat stress and metabolic and milk parameters in a commercial herd of Holstein cows located in southern Brazil. A total of 50 multiparous cows at different lactations and lactation stages were selected in order to obtain 450 samples during two consecutive years (2011 and 2012). The animals were fed a partial mixed ration along with ryegrass pasture in a semi-confinement system. Blood, milk, and urine samples were taken during the summer and winter for a total of eight samples. Three intervals of temperature-humidity index (THI) were established during the summer months (January and February) as follows: low group (LOW), THI between 75 and 81 (N = 100); moderate group (MOD), THI between 81 and 82 (N = 150); and severe group (SEV), THI between 83 and 90 (N = 150). The group of cows sampled during winter (July) constituted the control group (CON; THI = 59, N = 50). Increased total protein, albumin, glucose, and cholesterol occurred in heat-stressed cows. Increased AST activity was also observed in heat-stressed cows, but triglycerides and beta-OH-butyrate did not show any difference among groups. Lower lactate and higher pO(2) were seen in cows with heat stress than CON. Cows in SEV had a 21 % milk yield decrease, while lactose and protein decreased with fat not being affected. Heat stress had strong effects on metabolic, clinical, and performance parameters in Holstein cows.
机译：这项研究探讨了位于巴西南部的荷斯坦奶牛商业群中热应激与代谢和乳汁参数之间的关系。为了连续两年（2011年和2012年）获得450个样本，总共选择了50头处于不同泌乳期和泌乳阶段的多头母牛。在半封闭系统中，将动物与黑麦草牧场一起饲喂部分混合饲料。在夏季和冬季，采集了血液，牛奶和尿液样本，共采集了八个样本。在夏季月份（一月和二月）确定了三个温度-湿度指数间隔（THI），如下：低组（LOW），THI在75到81之间（N = 100）;中度组（MOD），THI在81至82之间（N = 150）;严重组（SEV），THI在83至90之间（N = 150）。冬季（7月）采样的牛群为对照组（CON; THI = 59，N = 50）。热应激奶牛体内总蛋白质，白蛋白，葡萄糖和胆固醇含量增加。在热应激奶牛中也观察到AST活性增加，但是甘油三酯和β-OH-丁酸酯在各组之间没有显示任何差异。与CON相比，热应激母牛的乳酸盐含量更低，pO（2）更高。在SEV中，奶牛的牛奶产量下降了21％，而乳糖和蛋白质的下降却不受脂肪的影响。热应激对荷斯坦奶牛的代谢，临床和性能参数有强烈影响。

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