Title : Effect of dietary rumen-protected choline in lactating dairy cows.

Pub. Date : 1991 May

PMID : 1880270






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1 Two experiments were conducted to test the effects of graded amounts of rumen-protected choline on milk yield and composition in lactating dairy cows fed 40% corn silage and 60% concentrate diets (DM basis). Choline Weaning weight-maternal milk Bos taurus
2 Increasing choline had no effect on DMI and tended to increase milk yield only from 1 to 2.2 kg/d. Choline Weaning weight-maternal milk Bos taurus
3 Milk fat percentage was reduced in the .078% choline treatment and increased to control levels thereafter with .156 and .234% choline. Choline Weaning weight-maternal milk Bos taurus
4 Milk fat percentage was reduced in the .078% choline treatment and increased to control levels thereafter with .156 and .234% choline. Choline Weaning weight-maternal milk Bos taurus
5 Increasing dietary choline to .24% linearly increased milk yield 2.6 kg/d, although it had no consistent effects on milk fat or protein percentage. Choline Weaning weight-maternal milk Bos taurus
6 There was only a slight tendency for greater responses in milk yield to dietary choline with lower dietary CP. Choline Weaning weight-maternal milk Bos taurus
7 Data from these experiments confirm earlier results with postruminal choline infusions, suggesting that choline may be a limiting nutrient for milk production. Choline Weaning weight-maternal milk Bos taurus