美姑山羊产后30 d内乳成分变化分析

研究美姑山羊母羊分娩后产生的羊乳中各组成成分随着泌乳时间的推移而产生的变化规律,旨在为羔羊的适时断奶以及制作代乳料提供理论依据。通过乳成分分析仪以及全自动生化分析仪得到了不同时间点的美姑山羊乳中各营养成分质量分数。乳成分中蛋白、乳糖、灰分、非脂固形物和矿物元素的质量分数随时间的推移呈现为先逐渐降低,随后在第10 d左右出现轻微上调,到30 d之间这一时段又保持在一个相对稳定的水平;乳脂随时间的变化不具明显的规律性。同时分析乳中各成分之间的联系,发现了蛋白质与乳糖,蛋白质与灰分,乳糖与灰分,铁与锌以及钙和磷两两之间存在显著的相关性,总结较优的模拟方程,得到了每组间最佳模拟曲线方程。本研究对美姑母乳早期泌乳阶段变化规律的探索,发现了乳中各成分的变化情况和相互联系,这为今后研制美姑山羊代乳料提供了基础参考数据。

Study on Meigu She-goat's Postpartum Milk Composition Changes in 30 Days

Our objective is to study the composition changes of milk produced by female Meigu goats as the lactation time progresses, aiming to provide a theoretical basis for the timely weaning of kids and making good milk replacer. We employ the milk Composition Analyzer and automatic biochemical Analyzer to measure the regular ingredients in Meigu she-goat milk at different stages of lactation. The results show that milk ingredients of protein, lactose, ash content, non-fat-solids and mineral elements gradually decrease over time, then slightly increase on the 10th day, and then remain at a relatively stable level till the 30th day; there is no obvious regularity for the change of milk fat over time; strong correlations between protein and lactose, protein and ash, lactose and ash, iron and zinc, and calcium and phosphorus are found in our analyses of the relationships between various milk ingredients, and the optimal simulation equation between each pair is obtained. This study uncovers the changes of various milk ingredients and their mutual relationships at different lactation stages of Meigu she-goat, and provides the basic data for development of milk substitutes for Meigu goat kids.