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Milk yield and hair coat characteristics of Holstein cows in a hot environment

机译：霍尔斯坦奶牛在热环境中的牛奶产量和毛发特征

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This study was conducted to evaluate the effects of hair coat characteristics on thermophysiological variables and body surface temperatures (BST), measured with infrared thermography, as well as milk yield of Holstein cows in a hot environment. Physiological and milk yield variables were assessed using 103 pluriparous Holstein cows. Also, hair angle (HA), density of hair coat (D), diameter of hair (HD), hair length (HL), weight of hair coat (Wt), and coat thickness (CT) were recorded. Biplot analysis (principal components analysis) revealed that HL was closely associated with Wt, CT, and HD and all these variables had a positive association with rectal temperature. Both CT and HL were found to be negatively associated with shoulder and neck temperature; tympanic temperature showed no association with BTS. Cows with short hair coat (length 17 mm) did not produce more milk in 305 days than cows with longer hair coat (9673 =1604 vs. 9277 817; P = 0.12). On the other hand, milk fat percentage at the middle of lactation was higher (P 0.01) in cows with longer hair relative to cows with coat hair 17 mm (3.71 vs. 3.35%, respectively). In conclusion, physical characteristics of the coat of Holstein cows were not associated with the 305-day milk yield but cows with longer hair produced a greater milk fat percentage at the middle of lactation compared to cows with short hair.
机译：进行该研究以评估用红外热成像测量的热性能变量和体表温度（BST）对热性能变量和体表温度（BST）的影响，以及在热环境中荷斯坦奶牛的牛奶产量。使用103个多次Holstein奶牛评估生理和乳产生变量。此外，毛发角（HA），毛发涂层密度（D），毛发直径（HD），毛发长度（HL），毛发涂层（WT）的重量和涂层厚度（CT）。 Biplot分析（主要成分分析）显示HL与WT，CT和HD密切相关，所有这些变量都与直肠温度呈正相关。发现CT和HL都与肩部和颈部温度负相关;鼓膜温度显示与BTS无关。短毛涂层的奶牛（长度＆ 17 mm）在305天内没有生产更多的牛奶，比奶牛长毛（9673 = 1604 vs.9277 817; p = 0.12）。另一方面，哺乳期中间的牛奶脂肪百分比在具有相对于具有涂层毛发的奶牛的奶牛的奶牛中较高（P <0.01）较高（P <0.01）。 17毫米（3.71 vs.3.35％）。总之，荷斯坦奶牛涂层的物理特性与305天的牛奶产量无关，但与具有短发的奶牛相比，奶牛的奶牛在哺乳期间产生了更大的牛奶脂肪百分比。

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