Estimating system of feeding and effect of fox reaning was caried out in a fox farm in Wilkowo Świebodzińskim in the year 1986-1989. The estimates was caried out on the basis of the income derived from the sales of skin, carcasses, other extracts and for reaning. From the basis of results it was found out that: - the main component of cost of production in the fox farm was cost of feeds. In the structure of consumed feeds 64% were derived from animals, 28% concentrated feeds and about 7% bulk feeds and the rest from added mineralised vitamins. It was convinced that the structure of consumed feeds was rational; - analysis of cost of productlon in the farm showed that cost of feed the lion share /41,3-45,2%/, the next was maintenance of the implements 6,2-8,1%, other expenses between 0,4-2,3%. The structure of costs changes according to the methods of estimating the feeds. In the analised cycle of production structure of costs, direct cost was 83,3-83,6% estimate of private cost and feed production from 85,3 to 86,2% at the actual market price. Upon the changes in the prices of implements, structure of cost in 1986 and 1989 was nearly similar; - production farm fox has a specific direction. In the structure of income, 94% of it came from the sales of skins. The production is highly lucrative and characterised with also high output of work and Capital invested. In the estimated farm, rate of profitableness in 1986 was 10,4% and in 1989 already 25,1%. The cesearch also shows fox rearing is prefered in complex-farm which gives possibly proper reclamation of utility refuse derived from animal production.
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