The objective of this study was to evaluate the utilization of different sources of unsaturated long-chain fatty acids in diets for dairy cows during the transition period and early lactation on the milk fatty acid profile and composition of the protein fraction. Thirty-six Holstein cows were divided into three groups, fed the following diets: control (C); soybean oil (SO); and calcium salts of long-chain unsaturated fatty acids (CS). The milk samples utilized for analysis were obtained weekly from parturition to […]

The effect of different fat supplements on intake, digestibility, nitrogen balance, milk yield and efficiency of nutrient utilization was evaluated in lactating dairy goats. Twenty-four dairy goats were assigned to a completely randomized design with four treatments and six replicates/treatment. The fat supplements tested were soybean oil (SO), calcium salts of long-chain fatty acids (CS) and whole soybean (WS), which contributed with 4.5% of dietary ether extract. A control diet with no added fat was also fed to the animals. […]

The objective of this trial was to evaluate the effect of supplementing diets with similar protein, fiber and lipid contents with different lipid sources on dry matter intake, milk yield and feed efficiency of early lactating Jersey cows. Eight multiparous cows averaging 420 kg of body weight and daily yield of 20 kg of 3.5% fat corrected milk (FCM) were randomly assigned to two replicated 4 x 4 Latin squares. Each experimental period lasted four weeks and means were compared […]