Effect of Calving Season on Productive Performance of Dairy Cows

Dairy Pub Date : 2024-03-07 DOI:10.3390/dairy5010018

M. Stojnov, T. Penev, Dimo Dimov, I. Marinov

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Abstract

The aim of the present research was to study the influence of the calving season in conditions of the upcoming climate changes on the productive traits of dairy cows in Bulgaria. The study was conducted on a cattle farm with a capacity of 500 dairy cows, which were loose-housed in open free-stall barns (shed-type). In the research, 286 lactations of 199 Holstein cattle from the studied farm were included. The cows with the highest average milk yield for lactation—8522.2 kg—calved in the spring, while the cows with the lowest milk yield—8082.7 kg—calved in the summer. Cows that calved in the spring had the highest maximum daily milk yield (lactation peak)—38 kg—whereas cows that calved in the summer had the lowest—35.7 kg. Regarding the composition indicators of milk, fat, and protein content, no significant effect of the calving season was found, but there was a tendency for the lowest values for the percentage of fat in milk to be reported for cows that calved in the summer—3.68%—and the highest for those calved in the spring—3.71%. Regarding the percentage of protein in the milk, the lowest values were observed for cows that calved in autumn—3.19%—and the highest for cows that calved in summer—3.27%.

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产犊季节对奶牛生产性能的影响

本研究旨在探讨在即将到来的气候变化条件下，产犊季节对保加利亚奶牛生产性能的影响。研究在一个可容纳 500 头奶牛的养牛场进行，这些奶牛散养在开放式自由堆放牛舍（棚式）中。研究对象包括该牧场 199 头荷斯坦奶牛的 286 个泌乳期。泌乳期平均产奶量最高的奶牛-8522.2 千克-在春季产犊，而产奶量最低的奶牛-8082.7 千克-在夏季产犊。春季产犊的奶牛最高日产奶量（泌乳高峰）为 38 千克，而夏季产犊的奶牛最低日产奶量为 35.7 千克。在牛奶、脂肪和蛋白质含量的成分指标方面，产犊季节没有发现明显的影响，但有一种趋势，即夏季产犊的奶牛牛奶中脂肪的百分比值最低-3.68%，而春季产犊的奶牛牛奶中脂肪的百分比值最高-3.71%。至于牛奶中蛋白质的百分比，秋季产犊的奶牛的数值最低-3.19%，夏季产犊的奶牛的数值最高-3.27%。

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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来源期刊

Dairy

CiteScore

4.40

自引率

0.00%

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