From 2010 to 2015, a short-haired mink from Denmark and Poland was imported to the Savvatievo Animal Farm, which is large in size compared to the domestic one. To preserve and further increase the size of the mink, in addition to breeding work, the feeding standards were revised. Since 2010, new non-traditional feeds have been introduced into the diet of animals, the nutritional value of which is not known yet, the caloric content in 2015-2017 was increased to 165-170 kcal and by 2018-2021 it was brought to 180 kcal per 100 g of feed, while at the same time gradually reducing the amount of protein: in 2015-2017 to 7.5 g and in 2018-2021 to 6.5-7.0 g per 100 kcal of feed for young animals during the growth period (July-October). Feed with a high fat content is introduced. In this regard, it was decided to conduct a detailed analysis of some non-traditional feeds by fatty acid composition and determine the effect of the introduction of these feeds on the growth of young animals.

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Until now, cellular fur animals are in strict dependence on photoperiods in nature, where light is a signal factor of the external environment for them [4]. Unlike other domestic animals, fur-bearing animals have retained a clear seasonality of reproduction (monoestrism) and molting of the hairline, and the light factor acts as a synchronizer of the effects on their body through the optic-hypothalamic-pituitary system. The production of appropriate hormones under the influence of photoperiodism is a tool that regulates the biological rhythms of the animal. The variability in the duration of pregnancy in the wild American mink (Mustela vison Schreber, 1777) is very high – it ranges from 38 to 80 days [1]. The duration of pregnancy in minks depends on the duration of the latent phase of this period. In the farm of OOO «Meha», work is underway to reduce the duration of pregnancy in female minks by artificially lengthening daylight hours at the place where the minks are kept during the gestation of puppies by the females. Stabilization of pregnancy and whelping in this way greatly facilitates the work of fur breeders and livestock specialists, allows you to get earlier litters from females, which contributes to an increase in the safety of puppies and their earlier jigging.

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