Phytobiotics in the diets of laying hens of various crosses, influence of the genotype on the payment of forage

Abstract

The paper presents the results of research on the introduction of phytogenic feed additives from local plant resources in the diets of egg-laying hens of different genotypes. The degree of assimilation (digestibility, use) of the feed nutrients and the conversion of the consumed feed (feed costs per 10 eggs and per 1 kg of egg weight) were determined. The costs of metabolizable energy and protein of feed per unit of production were analyzed. The composition of phytogenic feed additives under study: 1.5% (of the basic diet) flour of brown seaweeds (kelp) and 1.5% - flour of local wild herbs. It was found that their use in the diets of laying hens helps to intensify metabolic processes occurring in the body of all genotypes of poultry. The digestibility of the consumed forage hygroscopic moisture during the periods analyzed increased by 2.9-3.6%, protein digestibility by 2.9-4.3%, fat digestibility by 3.1-4.0%, nitrogen-free extractive substances by 3.9-4.6%, nitrogen use by 4.9-5.9% to the control indices of each genotype. Intensification of metabolic processes contributed to an increase in the payment for feed by products. Reduction of feed expenses for production of 10 eggs amounted to 5,5-7,3%, for 1 kg of egg weight - 8,4-13,9% to the control. The cost of metabolizable energy and protein of feed to produce a unit of product decreased. The analysis of the data revealed that laying hens of all genotypes responded positively to the inclusion of biologically active feed additive in their basic diet. The most "responsive" genotype (cross) to the intake of nutrients included in the phytogenic feed additive with the diet is the cross "Dekalb White". The birds of this cross showed higher results of intensity of metabolic processes of the body and payment for feed by products.