Abstract
The work aimed to study the effect of feed additives based on proteinase and phytase on the productivity, digestibility of nutrients and the development of laying hens up to 18 weeks of age. A total of 360 1-day-old Hisex Brown chickens were assigned to a completely randomized design composed of 3 diets with 4 replicates of 30 birds each. Dietary treatments were: (1) Control group: Basic diet with nutritional parameters consistent with recommended feeding standards, without enzymes additives, (2) experimental group A: Basic diet with the addition of proteinase at a concentration of 10 U/kg, (3) experimental group B: Basic diet with the addition of phytase at a concentration of 1000 FTU/kg. It has been shown that by adding microbial enzyme is increased digestibility of organic matter of diet of laying hens (p
Highlights
The use of feed enzymes is an actively developing area in the nurturing of farm birds and has shown active growth over the past decade
We studied the prospective application of histidine acid 3-phytase of Pantoea sp. 3.5.1 and subtilisin-like proteinase of B. pumilus 7 p as dietary supplements for laying hens
The introduction of exogenous phytases and proteinases with retained catalytic function, under optimal conditions, in the gastrointestinal tract is aimed at increasing the digestibility of nutrients in the feed mixture and reducing the cost of feed for growing young birds
Summary
The use of feed enzymes is an actively developing area in the nurturing of farm birds and has shown active growth over the past decade. The need for the use of enzymes is rooted in the development of new advanced technologies of modern poultry farming, the increased need for productive crosses and the importance of reducing the cost of the final product. Enzymes play a key role in the digestion processes of animals. Their activity determines the dietary indicator referred to as digestibility, i.e., the degree of nutrient assimilation of the feed. The feed mixture for laying hens is based on grain containing an increased amount of poorly digestible phytates, which accommodate up to 80% of the total phosphorus content in the grain (Vieira et al, 2016)
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