ABSTRACT

This experiment evaluated the effects of inclusion of three different types of calcium salts (CaS): mixed fatty acids, 70% palmitic acid-based and rapeseed oil-based, on milk production and milk fatty acid composition. Dietary treatments were randomly assigned to six mid-lactation dairy cows in a double Latin square experimental design with three 21-days experimental periods. All cows received a similar amount of grass-clover silage and concentrates and an additional 800 g of CaS daily. Analysis of milk fatty acids showed that a high proportion of palmitic acid in the feed resulted in milk fat with significantly higher levels of C16 fatty acids than with CaS based on rapeseed oil. Milk from cows on the diet with rapeseed oil based CaS contained significantly higher concentrations of C18 fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids and trans fatty acids than milk from cows on the diet with palmitic acid CaS.

摘要

该实验评估了三种不同类型的钙盐（CaS）的掺入对牛奶产量和牛奶脂肪酸组成的影响：混合脂肪酸，70％棕榈酸基和菜籽油基。在双拉丁方实验设计中，将饮食处理随机分配给六头泌乳中期的奶牛，实验期为三个21天。所有奶牛每天都接受类似量的青草三叶草青贮饲料和精料，另外还接受800克CaS。牛奶脂肪酸的分析表明，饲料中高比例的棕榈酸会导致牛奶脂肪中的C16脂肪酸含量明显高于菜籽油中的CaS。日粮中以菜籽油为基础的CaS来自奶牛的牛奶中，C18脂肪酸，单不饱和脂肪酸，