THE PECULIARITIES OFAMERICAN MINK MALESʼ CASE BRAIN SKELETON OF STANDARD AND LAVENDER GENOTYPES (IN THE NORM AND INFLUENCED BY BIOSTIL SPECIMEN)

The paper explores Biostil specimen on the American mink males of Standard and Lavender genotypes. The males selected were of different age from the experimental fur farm of theInstituteofCytologyand Genetics of Siberian Department ofRussianAcademyof Science. The paper is aimed at investigation of the influence on the growth and development of American mink males’ case brain skeleton of different genotypes aged 40–50; 86–90 and 176–180 days. The mink stock was bred by parents who were fed with Biostil dozed 0.05 ml/kg of body weight during 5 days before oestrum and during the oestrum. The authors observed the control animals who were not fed with Biostil. The mink stock was divided into the experimental and control groups according to the age and genotype features. The research was conducted by means of descriptive anatomic method and craniometric features. The authors found out 18 craniometric features. The research results show that Biostil influences positively morphogenesis of American mink males’ case brain of Standard genotype and some negative impact of Biostil on Lavender genotype. These impacts are mostly observed in the group of the males of reproductive age. Biostil impact on the morphogenesis of Lavender minks (a/a m/m) is followed by the changes in physiological parameters of growth and development of case brain that are mostly observed in the reproductive age. This impact is characterized by lower parameters of the case brain and lower growth of dorsal, ventral, cervical and sagittal crests.

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