牦牛初乳及其过渡乳中维生素变化规律的研究

Research of the changes of vitamins of yak colostrum and transient milk

以牦牛分娩后7d内初乳及过渡乳为研究对象,利用高效液相色谱法分析了不同泌乳时期其维生素A、维生素E及B族维生素的含量变化规律。结果表明,牦牛初乳中VA、VE、VB1、VB2和VB3在分娩后第1d含量最高,分别为367.76、780.11、93.41、367.76、98.93μg/100g,之后随分娩后泌乳天数的增加急剧下降(p<0.05),3d后下降速度趋于平缓;VB5在分娩后第1d含量最低,为201.49μg/100g,3d内含量急剧上升(p<0.05),随后速度趋于平缓;VB6和VB11不受泌乳天数的影响;初胎牦牛初乳及过渡乳中VA、VE、VB1含量高于经胎;其他维生素含量不受胎次影响。本文为合理开发利用牦牛乳资源提供理论依据。

Yak colostrum and transient milk within the first 7d after parturition as the research object,the changes of vitamin A,vitamin E and B vitamins during the different lactation periods were analyzed by HPLC. The results showed that the highest concentration point of VA,VE,VB1,VB2 and VB3 in yaks colostrums was on the 1st day,the numbers respectively reached 367.76,780.11,93.41,367.76,98.93μg/100g, respectively. Besides, the numbers had a sharp decline with the process of lactation（p〈0.05） and gradually became moderation 3 days later. The lowest concentration（201.49pg/100g） of VB6 was observed in yak colostrum on the 1st day and increased dramatically in the first 3 days（p〈0.05）,followed by a slight increase. The concentrations of VB6 and VB, were not affected by the studied lactation. In addition,the concentrations of VA,VE and VB1 in primiparous yak colostrums and transient milk were higher than the multiparous,and other vitamins were not affected by the parity. The results provided theoretical basis for reasonable exploitation and utilization of yak milk resources.