爱尔兰奶牛场产奶量记录方法的挑战与机遇:测定日产奶和奶罐样品比较  

Challenges and Opportunities of Milk Recording Methods in Irish Dairy Farms

作　　者：李胜楠(编译) 郭凯军[1] LI Shengnan;GUO Kaijun(Beijing University of Agriculture,Beijing 100096)

机构地区：[1]北京农学院,北京100096

出　　处：《中国乳业》2024年第11期40-44,共5页China Dairy

基　　金：北京市家畜创新团队项目(BAIC05-2024)。

摘　　要：[目的]探索和量化在爱尔兰商业奶牛场测定日、与奶罐样品的乳脂率和乳蛋白率的差异。[方法]数据来自2021年2841个畜群的5742次产奶量记录,奶罐样品与测定日记录在同一天进行。检测日奶样乳脂率和乳蛋白率使用ICAR批准的上午或下午交替采集奶样的预测方程来评估。[结果]测定日与奶罐样品的乳脂率和乳蛋白率之间的Pearson相关系数分别为0.82和0.96。这些相关性对应于乳脂率和乳蛋白率的平均差异为0.1%和0.01%,测定日产奶量记录显示两种测量值均较低。使用EDIY(自动采集测试样本的电子自制仪表)和Non-EDIY(由牛奶记录员手动采集测试样品)两种设备测定的牛群乳脂率相关性分别为0.87和0.72。测定日产奶量较高的畜群表现出较低的乳脂率相关性。同样,在产奶高峰季节采集的奶样与非高峰季节采集的奶样相比,乳脂率差异更大。[结论]与奶罐奶样相比,在测定日产奶量记录报告中,乳脂率变化较大。这种变化的程度受产奶量、季节、记录设备或者这3个因素的综合影响。[Objective]This study was to explore and quantify the differences in fat and protein percentages between milk samples collected on test day milk recordings and those obtained from daily bulk collections in commercial dairy herds in Ireland.[Method]The dataset comprised 5742 milk recordings from 2841 herds in 2021,where daily bulk collections were taken on the same day as the milk recording.The predicted fat and protein percentages for test day milk were estimated using either the AM or PM milk samples and were incorporated into prediction equations approved by ICAR.[Result]The Pearson correlation between fat and protein percentages from test day milk recording and daily bulk samples was 0.82 and 0.96,respectively.These correlations correspond to mean differences of 0.1%and 0.01%for fat and protein percentages,with the average test day milk recording showing lower values for both measurements.Fat percentage correlations for herds using EDIY(electronic do it yourself meters which take a test sample automatically)and Non-EDIY(manual recordings where a milk recorder visits and takes a test sample)recording devices were 0.87 and 0.72,respectively.Herds with a higher average test day cow yield demonstrated a lower fat percentage correlation.Similarly,samples taken during peak milk production season exhibited larger differences in fat percentages compared to those taken during the off-peak milk production season.[Conclusion]The findings of this study clearly indicate that the largest variation is observed in the fat percentage reported in test day milk recordings when compared to the corresponding daily bulk samples.The extent of this variation is affected by yield,season,recording type,or a combination of all three factors.

关 键 词：产奶量记录 爱尔兰 奶牛场 奶牛 

分 类 号：TS252.7[轻工技术与工程—农产品加工及贮藏工程] S823[轻工技术与工程—食品科学与工程]