Abstract
The article presents the results of the use of protein supplements of animal origin compared to the addition of feed yeast. Experiments were conducted in laying hens with ileal fistula. The results showed that the introduction of protein additives of animal origin reduced the amount of urine produced per day in laying hens. The amount of calcium excreted in the urine increased by 13%. And the phosphorus level decreased by 80%. Trypsin activity in the serum of chickens fed fishmeal was 30% higher than in the control group, and in the group fed meat-and-bone meal it was 26% higher than in the control group.
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