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Research Article

Ontogenetic features of protein metabolism in laying hens during the rearing and egg production period

Bohdan Kyryliv 

Laboratory of Physiology-Biochemical Basis of Poultry, Institute of Animal Biology of NAAS, Stusa str. 38, Lviv, Ukraine

1. Acta Sci. Pol. Zootechnica, 17(3), 2018, 17‒22
2. DOI: 10.21005/asp.2018.17.3.03

Abstract. We have studied the dynamics of growth and development of Hayseks Brown layer hybrids, from day 1 of age to peak egg production. During the experiment, the study of the intensity of metabolic processes in the body of 6, 35, 90, 120, and 150 day-olds, i.e. in critical periods when there is intense growth of feathers and juvenile molt (30–60 days), the beginning of the oviposition (120 days) and the beginning of an intensive egg production (150 days). In these age periods, the level of soluble proteins, amine nitrogen, and the activity of alanine and aspartate aminotransferases were determined in liver tissues, the mucous membrane of the proventriculus, duodenum and pancreas. As a result of the research, it was found that the intensity of the growth of chickens is different from the recommendation for the "Hayseks Brown" cross. Only at the age of 119–126 days growing the body weight of the reared chickens coincides with the recommended technology for hens of the cross "Hayseks Brown". During the growth of young birds, in the critical periods of growth and development, it is necessary to deliberately affect the processes of protein metabolism by enhancing the processes of digestion and assimilation of nutrients and biologically active substances of fodder.

Keywords: hens, live weight, egg production, critical periods, soluble proteins, amine nitrogen, alanine transaminase, aspartate transaminase