牛乳中脂蛋白比变化规律研究

Study on Variation of Fat-to-protein Ration of Holstein Cows

[目的]探索牛乳中脂蛋白比在不同胎次、产犊季节、泌乳月份和测定季节的变化规律.[方法]对我国荷斯坦奶牛牛奶中FPR及乳成分相关指标进行测定,分析胎次、产犊季节、泌乳月、测定日产奶量、乳成分、测定季节等因素对乳中脂蛋白比的影响.[结果]该牛场脂蛋白比为1.26±0.19,胎次、泌乳月和测定月份对脂蛋白比的影响达到显著水平（P＜0.05）,而产犊季节对脂蛋白比无显著影响（P＞0.05）.第1胎奶牛乳中脂蛋白比（1.23±0.17）显著低于第4胎次奶牛（1.32±0.2）.第1个泌乳月脂蛋白比最高（1.49±0.26）,2～6个泌乳月脂蛋白比逐渐下降,7～12个泌乳月脂蛋白比基本保持不变,此后又开始下降且达到最低（1.17±0.17）.[结论]胎次、泌乳月和测定月份对脂蛋白比的有显著影响,而产犊季节对脂蛋白比的影响不显著.

[Objective] The objective of this study was to explore the effects of the different parity,calving season,lactation month and seasons on fat-to-protein ratio （FPR）.[Method] The relevant indicators of FPR and milk composition in Holstein cow were determined.The effects of the different parity,calving season,lactation month and seasons on FPR were analyzed.[Result] The FPR were 1.26 ±0.19.Different parity,lactation month and seasons have greatly significant effects on FPR（P 〈0.01）,but calving season has no significant effect on FPR（P 〉0.05）.The FPR in the first parity（1.23 ±0.17） is significantly lower than the other parities（1.32 ±0.2）.The FPR in the first lactation is the highest,and it drops sharply from 2th to 6th of lactation month.It＇ s unchanged from 7th to 12th of lactation month,then falls to the lowest in the end periods of lactation （1.17 ±0.17）.[Conclusion] Parity,lactation month and seasons have greatly significant effects on FPR,and calving season has no significant effect on FPR.