Evaluation of Nutrition According to Milk Metabolites and Components in Seasonal Dependence in Dairy Cows

Petra Timkovičová Lacková, Iveta Maskaľová, Vladimír Vajda, Lukáš Bujňák
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Abstract

Abstract The objective of this study was to evaluate the nutrition according to the milk metabolites and components during the seasonal dependence of the dairy cows. In the summer time, it was confirmed that significantly lower content of milk protein and fat (P < 0.001) and lower milk, protein, and fat yields (P < 0.001) occurred, compared to the autumn period. The content of milk lactose was not statistically significant (P > 0.5). The evaluation of nutrition according to protein in milk and milk urea in the summer period was confirmed in the 2nd group of milk samples which represented 53 % of the group’s higher content of milk urea, higher content of urinary nitrogen excretion, and a lower nitrogen utilization efficiency compared to the 1st group of milk samples. The autumn period was confirmed in the 2nd group of milk samples which represented 53 % of the group with higher milk yield and lower content of milk proteins and milk fat compared to the 1st group of milk samples. The evaluation of nutrition using the analysed content of milk urea and proteins in milk represents a suitable tool for evaluating the impact of malnutrition or overfeeding of energy and protein on milk production and other components.
奶牛季节依赖性中乳代谢物和成分的营养评价
摘要本研究的目的是根据奶牛季节依赖过程中乳代谢产物及成分的变化来评价其营养价值。在夏季,证实乳蛋白和脂肪含量显著降低(P <0.001)和较低的牛奶、蛋白质和脂肪产量(P <与秋季相比,出现了0.001)。牛奶中乳糖含量差异无统计学意义(P >0.5)。第二组乳样的营养评价依据是乳蛋白和乳尿素,与第一组乳样相比,第二组乳样的乳尿素含量较高,尿氮排泄量较高,氮利用效率较低,占53%。与第一组牛奶样品相比,第二组牛奶样品中有53%的牛奶产量较高,牛奶蛋白质和乳脂含量较低。通过分析牛奶中尿素和蛋白质的含量来评估营养,是评估营养不良或能量和蛋白质过度喂养对牛奶产量和其他成分影响的合适工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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