MORPHOLOGICAL CHARACTERISTICS OF THYMUS OF NEWBORN AMERICAN MINK OF DIFFERENT COLOUR GENOTYPE

Abstract

The paper explores hystomorphological peculiarities of thymus structure of newborn American minks of Standard (+/+ +/+), Sapphire (а/а р/р) and Lavender (a/a m/m) genotypes. The authors found out that minks aged 1 day have formed thymus, parenchyme of cones is divided into cortical and renal medulla. The authors observed clear cortical and medullary ration in Lavender minks and poor demarcation in Standard and Sapphire minks. Maximum parameters of relative and absolute mass of the thymus were observed in Standard minks and minimum parameters - in Sapphire minks. The sectional area of cones in the thymus of Lavender minks was higher in comparison with other groups (187516.50±20972.67 mkm2). The sectional area of cones in the thymus of Standard and Sapphire minks didn’t vary greatly and it was 111941.40±13262.30 and 114024.20±17013.83 mkm2. The authors observed wider space of cortical substance in Lavender minks in comparison with this parameter in Standard and Sapphire minks. Cortical/medullary ratio of Sapphire minks has the lowest ration 4.60±0.38 and reaches its maximum in Lavender minks - 7.57±0.85. Hassal’s bodies were observed not in all cones; they are seen as single-cell and simple forms whereas multicellular amylaceous corpuscles are rarely observed.