THE DEVELOPMENT of INTERNAL ORGANS in the DIFFERENT GENOTYPES RAMS LAMBS
Aim. To conduct a comparative analysis of the internal organs development the different genotypes rams lambs obtained from crossing the Ascanian Meat-and-Wool breed of ewes with crossbred wool, which were mated with rams sires of the specialized meat breeds of Texel and Dorper. Methods. Zootechnical, morphological, biological and statistical. Results. It was found that in crossbreeds of Dorper with Ascanian Meat-and-Wool breed with crossbred wool and Texel with Ascanian Meat-and- Wool breed with crossbred wool (hereinafter referred to as experimental groups I and II respectively), the heart weight was 1.9 and 21.5% more than pure-bred animals of the Ascanian Meat-and-Wool breed with crossbred wool (control group). By mass of lungs, pure-bred sheep exceeded animals of the II and I experimental groups by 17.5% and 9.4, respectively. Individuals of the І experimental group differed in the greater mass of the liver, the II experimental group on this basis almost did not differ from the control. By the mass of the stomach as a whole, the ram’s lambs of the experimental groups exceeded the analogues from the control group. The mass of the scar, mesh, and book in animals of the experimental groups was higher than that of the analogues of the control group, but the opposite was observed in the mass of the abomasums. The mass of the small intestine (without content) of animals of the І experimental group was less compared to the mass of the same department in animals of the control and II experimental group, but at the same time the absolute length of the small intestine was greater. Conclusions. The hybrids for the development of most internal organs exceeded their purebred counterparts, which may indicate more intense metabolic processes in these animals.