Abstract
Twenty dairy cows in early lactation were assigned to one of two dietary treatment groups based on milk production and days in milk. Treatments were a total mixed ration containing 13.2% whole cottonseed on a DM basis with or without added Ca salts of long-chain fatty acids. Treatments were fed ad libitum for 11 wk. Dry matter intake and body weight were not affected by treatment. The addition of Ca salts of long-chain fatty acids had no effect on yield of actual and FCM. Percent milk fat, lactose, and SCC did not differ between treatments. Percent milk protein tended to be lower for cows fed the diet containing calcium salts of long-chain fatty acids. Milk production efficiencies and NDF and ADF digestibilities were unaffected by treatment. Results indicate that diets containing high amounts of cottonseed may mask the effects of energy provided by Ca salts of long-chain fatty acids.
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