日粮宾州筛层级比例对泌乳牛产奶量、乳成分相关性关联分析与优化

Correlation analysis and optimization of the proportion of Pennsylvania sieve level on milk yield and milk composition of lactating cows

中文关键词: TMR日粮、宾州筛层级比例、乳成分、相关性分析

英文关键词: TMR Ration  Proportion of Pennsylvania sieve level  Milk composition  Correlation analysis

中文摘要:

      [目的]试验旨在对不同规模化牧场奶牛日粮宾州筛层级比例进行分析，研究其日粮宾州筛层级比例对泌乳早期奶牛产奶量、乳脂率、乳蛋白和尿素氮等乳成分的相关性，根据相关统计分析方法，结合日粮宾州筛的层级比例推荐范围，得出最优的日粮宾州筛层级比例。[方法]选择黑龙江省12个规模化牧场，对泌乳天数在0-100天内的泌乳早期高产奶牛TMR日粮进行取样分析，对日粮宾州筛层级进行相关性分析、改进的灰色关联分析和通径分析，确定影响产奶量和乳成分的主要层级及其最优比例。[结果]结果表明：日粮宾州筛第二层筛比例与泌乳前期奶牛产奶量和尿素氮呈正相关关系（相关系数为0.656，0.531，P＜0.05），与乳脂率呈负相关关系，（相关系数为-0.448，P＜0.05），日粮宾州筛第三层筛比例与乳蛋白率呈负相关关系（相关系数为-0.305，P＜0.05）。[结论]研究发现，当日粮宾州筛第二层级比例处于35-40%范围内时，泌乳前期奶牛的产奶量和乳脂率可达相对最优水平；乳蛋白含量的最优区间为第三层筛日粮比例15-20%的区间内。

英文摘要:

      [Objective]Experiment aimed to different scale pasture cows diet Pennsylvania sieve level ratio analysis, study the diet of Pennsylvania sieve level proportion of early lactation cows milk production, fat rate, the correlation of milk ingredients such as protein percent and urea nitrogen, according to the statistical analysis method, combined with diet Pennsylvania sieve level proportion recommended range, it was concluded that the optimal proportion of diet screen hierarchy, Pennsylvania.[Method]Twelve large-scale ranches in Heilongjiang Province were selected to sample and analyze the TMR diet of early lactating high-yielding cows within 0-100 days of lactation. Correlation analysis, improved grey correlation analysis and path analysis were performed on the diet screening level to determine the main levels affecting milk yield and milk composition. [Result]The results showed that: The proportion of the second layer of the Penn screen was positively correlated with milk yield and urea nitrogen in early lactation cows (correlation coefficient was 0.656, 0.531, P < 0.05), and negatively correlated with milk fat percentage (correlation coefficient was -0.448, P < 0.05). There was a negative correlation between the proportion of third layer sieve and milk protein percentage (correlation coefficient was -0.305, P < 0.05).[Conclusion]It was found that the milk yield and milk fat percentage of early lactation cows could reach the relative optimal level when the proportion of the second tier of Penn screen was in the range of 35-40%. The optimal interval for milk protein content was the interval between 15 and 20% of the third screen diet.