Наследование пятнистости при разных методах разведения соболей

The purpose of the study is to determine the nature of spottiness inheritance of sables. The result analysis of spot sable reproduction was conducted in fur farm “Pushkinskij” in Moscow region in 2006-2009. Spottiness expression was evaluated on the head, body, legs and tail on a 5-point scale (1 point to the lack of the sign, 5 points to the maximum expression). There were studied two types of breeding: spotty “in-itself” and hybridization with sables of standard colour. When breeding spotty parents “in-itself” the expressiveness of the sign at cubs compared with parents is not definite. The analysis of equidistributed estimate of both parents and offspring for each topographical section found, that the most spottiness index on a body, tail and legs (by 0.68, 0.19, and 0.08 points) is typical for offspring, on a head (by 0.08 points) for parents. Consequently, the size of spots on the hair of sables is a quantitative indication and inherits by intermediate mode. In four years 269 offspring were obtained in crossbreeding, including 130 descendants without spots and 139 spotty descendants. From them 169 offspring were registered by spotty fathers, and 87 ones (51.5 %) were spotty. One hundred cubs were obtained by spotty mothers, and 52.0 % of them were spotty. It indicates the conditionality of spottiness by dominant mutation in heterozygous state. The highest correlation coefficient values are typical for pairs “body-legs” in both types of crossing (0.71 and 0.42) and in combined crosses (0.66), suggesting that they have similar hereditary basis. Therefore, other things being equal, preference should be given to individuals who have a well-developed spottiness concurrently on the body and legs, when breeding for spottiness increase.