The effect of feeding level on the genetic variability of female minks

The results of the assessment of individual genetic variability in young female short-haired mink at different biological periods are presented. The experiments were conducted under the conditions of the existing technology of housing and feeding in 2019, 2020. For the experiment, two groups of 40 rearing females (at the age of 2 months) of the short-haired mink of the standard black breed (Neovison vison) were formed. The control group of females at the age of 2-4 months was fed according to the recommended energy standards. The experimental group of females was limited in the level of feeding (in terms of energy) by 10.0%. The frequency of erythrocytes containing microkernels in the peripheral blood of females was found to depend on the level of feeding during different periods of ontogenesis and the reproductive cycle phases. This method can be used to predict the reproductive success of female minks. The frequency of erythrocytes with microkernels in the rearing female minks of the control group at the age of 4 months during the formation of their reproductive functions was 2 times higher than in the experimental group (2.97 ± 0.42 vs. 6.01 ± 2.75‰). At the age of puberty (10 months) the frequency of erythrocytes with microkernels in rearing females is statistically significantly higher - 14,36 ± 1,87-14,89 ± 3,67‰ (p < 0,05; p < 0,01), than at the age of 4 months. The following productivity indices were obtained in the studied females of the control and experimental groups: the fertility of females - 5,63 ± 0,64 and 5,67 ± 0,77 pups, the yield of pups per a main female - 4,4 ± 0,77 and 4,67 ± 0,85 pups respectively. There were no unbred females and those which mated with males but did not have a litter in the experimental group, and the yield of pups per a female was 0,27 more. The microkernel test can be used to assess the stability of the genetic apparatus during different phases of the reproductive cycle of female minks and predict the reproductive success of females.

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