A mixture of milk cows (Friesian) 5 years old and in the fourth season of production weighing 600 kg, and their average milk production is 29 kg
Where 18 kg of concentrated feed is given + 4 kg of hay distributed in two batches in the morning and evening, and through several experiments, it was noted that after serving the previous mixture for 15 days, adding baker’s yeast 10 g / day to one cow led to good results and a marked improvement in production by 1-2 kg of milk / day
