FEATURES OF POSTNATAL ONTOGENESIS OF YOUNG SHEEP OF INTENSIVE GENOTYPES
DOI:
https://doi.org/10.32636/agroscience.2026-(5)-2-7Keywords:
ewes, fertility, lambs, prydniprovska meat (DP), merinolandshaf (ML), F1 crosses, growth and development, live weight, gainAbstract
Comparative data on the development of young sheep of different genotypes obtained by purebred breeding of the prydniprovska meat breed and industrial crossing of prydniprovska meat ewes with merinolandshaf rams are presented. In ewes, with purebred breeding, the fertility rate was within – 146.8 % and corresponds to the reference level for this breed. When using industrial crossing, the fertility level of ewes increases to – 164.8 %. 14.5 % more lambs were obtained than with purebred breeding, with their survival to weaning of 97.5 %. The peculiarities of growth and development of young sheep of these genotypes were established. The crossbred lambs (F1) of the experimental group exceeded their peers of the control group in live weight at birth in rams by 6.9%, in ewes by 7.1 %. At weaning, the difference was 17.48 % and 13.6 %, respectively, with a further decrease to 15.06 % and 12.87 % depending on sex. Sexual dimorphism was observed as the ratio of live weight in males and females in all accounting periods, where rams dominate over ewes with a coefficient in DP – 1.024 at birth, and – 1.055 in other age periods. Among crossbred peers, the level of this coefficient was – 1.022 at birth, increasing to – 1.091 in the future. In terms of absolute growth rates, crossbred animals outperformed their purebred peers at weaning by lambs by – 19.3 %, at the age of 8 months by – 15.9 %. The indicators of maiden ewes during this period were at the level of 14.8 % and 13.5 %, respectively. In general, crossbreds outperformed their purebred counterparts in live weight at the age of one to eight months, which may indicate good meat qualities, growth intensity and significant genetic potential for their precocity
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