INFLUENCE OF AGE OF LAYING HENS ON MORPHOMETRIC INDICATORS OF EGGS
УДК: 636.5.034:611.087.1 DOI: 10.31588/2413_4201_1883_2_255_55
Keywords:
cross, chickens, morphometric parameters, egg morphology, physicochemical composition of eggsAbstract
Studies have been carried out to study the morphometric parameters of chicken eggs, characterizing their morphological and qualitative composition, as well as an analysis of their dynamics during the reproductive period. The work was performed on laying hens of the Brown Nick cross at the age of 42 and 80 weeks. In the later reproductive period of chickens (80 weeks), the volume of the egg (by 10.1 %), the area of the longitudinal section (by 9.1 %), the large diameter (by 7.5 %), the surface area (by 7.4 %), and the length of the larger circumference (by 5.2 %) increase. The small diameter (by 1.3 %), the length of the smaller circle (by 1.2 %), and the cross-sectional area (by 2.5 %) change slightly. The egg shape index varies from 0.755 to 0.857 at 42 weeks of oviposition, and at 80 weeks from 0.684 to 0.844 units. With an increase in the mass of eggs, the value of the shape index significantly decreased by 6.4 %. Protein weight increased by 5.0 %, yolk by 23.2 %, shell by 13.9 %. A positive correlation was found between the angle of the sharp end of the egg and the cross-sectional area (0.33), as well as the longitudinal section area (0.23). The physical dimensions of eggs and the proportions of morphological features, as well as their absolute and relative values, are determined by heredity, the degree of realization of which depends on paratypic factors.
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