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首页> 外文期刊>Tropical Animal Health and Production >Change of daily milk yield during estrous period in Holstein cattle raised under Mediterranean climate
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Change of daily milk yield during estrous period in Holstein cattle raised under Mediterranean climate

机译：在地中海气候下荷斯坦养牛中富华时期日常牛奶产量的变化

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摘要

This study was conducted to determine the effect of estrus on the daily milk yield in Holstein cows and to investigate the chance of using the possible milk yield changes in determining the estrus. During the 3-year period of the study, 103 dairy cows were observed 4days before and 4days after daily milk yield of 240 estruses and a total of 2174 daily milk yields were evaluated. Variance analysis was used to determine the factors affecting the daily milk yield, and the LSD test was used for multiple comparisons. Insemination year, insemination season, number of lactation, milk yield group, and daily milk yield of lactation period were found to be significant (P0.01). On the other hand, the effect of estrus days on milk yield was insignificant. In the days of estrus, the least square mean of milk yield is 31.0kg, while the lowest and highest milk yields are 10.2kg and 62.9kg. The daily milk yield in the estruses decreased by an average of 300g, which decreased to 400g by continuing 1day after the estruses. The next day, however, it increased rapidly by 600g, and then dropped again, probably due to the effect of metestrus. It was found that, among all estruses, 31.3% of cows decreased their milk yield, whereas 26.5% of cows increased their milk yield. However, 42.2% of cows both decreased and increased their milk yield in different estruses. The interval between birth and the first insemination after were found to be longer (97.5days and 92.9days) at high milk-yielding cows compared to the low milk-yielding cows. According to the results of this study, daily milk yield changes could not be used as an estrus indicator.
机译：进行该研究以确定雌激素对Holstein奶牛的日常奶产率的影响，并研究使用可能的牛奶产量的机会决定雌性。在该研究的3年期间，每日乳收率为240次乳腺产量之前，在4天和4天之前观察到103奶牛，评估了总共2174次每日牛奶产量。方差分析用于确定影响每日牛奶产量的因素，并且LSD试验用于多种比较。发现泌尿氨酸年度，泌尿氨酸季节，哺乳期，乳产量组和日常牛奶产量的哺乳期较显着（P <0.01）。另一方面，发情日对牛奶产量的影响是微不足道的。在雌雄的日子里，牛奶产量的最小平均平均值为31.0kg，而最低和最高的牛奶率为10.2kg和62.9kg。雌性中的每日牛奶产量平均下降300克，在雌激素后1天继续下降至400g。然而，第二天，它迅速增加了600克，然后再次掉落，可能是由于Metestrus的效果。发现，在所有雌性中，31.3％的奶牛减少了产奶率，而26.5％的奶牛增加产奶产量。然而，42.2％的奶牛都减少并增加了不同的雌性产量。与低牛奶产量的奶牛相比，出生和第一个授精之间的间隔和第一个授精的间隔在高奶牛的奶牛中被发现更长（97.5天和92.9天）。根据本研究的结果，每日乳收产生变化不能用作雌性指标。

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