Changes In The Postnatal Ontogenesis Of Historological Indicators Of The Four-Headed Muscle Number Of Hisori Sheep

Abstract

Some histological features of the quadriceps muscle of the limb at different physiological stages of postnatal ontogeny of Hisori
sheep were studied, and the diameter of the muscle fiber gradually increased from the first 3 days to 60 months of postnatal
ontogenesis, regardless of their living conditions, and the highest rate was observed at 60 months. The absolute indicator of
muscle fiber area was found to be a physiologically mature stage of postnatal development in animals, i.e., a slight increase
during the period up to 18 months, and this process continued without significant change in the next 36 and 60 months.
Although the absolute values of muscle fiber diameter and area increased periodically from 3 days to 60 months of postnatal
ontogeny, they were found to be higher in animals under adequate conditions than under inadequate conditions.