The biological material under study consisted of 40 Romanian Spotted milk cows at the debut of their lactation. The effect of using animal fat in dairy cows feeding was established on two groups of 20 Romanian Spotted Breed dairy cows. Milk yield and butterfat in the milk of dairy cows fed with animal fat were favorably influenced, as production values obtained were higher and higher with each month of checking. The milk yield was 8.053 kg, and the average milk fat 4.8% for the experimental and 7.309 kg with 4.1% fat for the control.