[Hepatosis of fur animals under intensive production]
2007
Kochueva, N.A., Kostroma State Agricultural Academy (Russian Federation)
The reasons of occurring and spreading Hepatosis in mink were considered at the Sudislavl Company, Ltd in 2001-2005. The incidence of female mink was recorded oftener before (January – 0.4%) and in the estrus period (February – 0.1%), pregnancy (April – 28.8%) and lactation (May – 56.4%). A close correlation was found between the incidence of Hepatosis and the level of feeding, that is, between the ratio in rations of meat and fish feeds and the manifestation of hepatopathies. So, in 2001, 2002, 2004 and 2005, when the portion of fish feeds was 51.89%, 51.3%, 45.2 and 48.3%, respectively, clinical signs of Hepatosis supported with postmortem examination were observed in 37.3, 35.1, 34.2 and 36.9% of mink. The change of the diet structure when the portion of meat feeds was 37.9% added with 1.2% of beef liver, animal fat and vegetable feeds with 34.2% of fish feeds reduced the incidence of mink up to 15.1%. A study of the incidence showed that in cubs the signs of fatty degeneration are evident already in the first days after birth, 75% are the offsprings of young females, whereas in adult mink females the incidence of cubs in different years was 1.0% to 14.3%. It is concluded that Hepatosis in mink declares itself in seasonal and age dynamic associated with rut, pregnancy, lactation, as well as predominating in rations fish rich in fatty acids easily oxidizing and destroying vitamins.
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