M.A. Dinis, E.G. Kvartnikova
NIIPZK, Russia, Moscow region, Ramensky district, Rodniky, Trudovaya st, 6.
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Summary. At the present time the base of the diet for young mink is by products of the second category and fish waste with a low nutrition value, at the same time animal protein remains deficient and costly. In the represented work a shot was made at replacing of 15 and 20 % of daily protein in the diet of young mink with the corresponding amount of the limiting amino acids DL-methionine and L-tryptophan. Before the conduction of the scientific and economic experiment the actual content of the following amino acids in the main diet was tested: lysine, methionine, cystine, tryptophan, that served as the basis for the planning of the experiment. The scientific and economic experiment on young minks was carried out on the farm “Maloyaroslavetskoe zverovodstvo” in Kaluga Region. During the experiment common laboratory methods were used to keep a control on the nutrition value, sanitary and chemical quality of the diet and the vitamin nutrition of animals. The nutrient ratio did not entirely comply with recommended one: the carbohydrate level was lower than the optimal one during the whole test, the protein level right up to November and the level of fat during autumn months was somewhat higher, yet no evidences of such defects as “wet belly” on the skin or ketosis were noticed on the animals. By dynamics of the live weight and the quality of fell the animals from the control and the experimental groups did not sufficiently differ. The results for live weight of males, in grams: Control Group – 2540±61; Group 2 (with 15% replacement) – 2557±70; Group 3 (with 20 % replacement) – 2550±50; pelt quality, in %: Control Group – 143.4±2.7; Group 2 – 145.4±3.1; Group 3 – 138.4±3.5; pelt area, in sq cm: Control Group – 1260±19.5; Group 2 – 1269±17.3; Group 3 – 1261±17.4. Reduction of the daily consumption of digestible protein for young mink by 15…20 % with compensation of the limiting amino acids with synthetic DL-methionine in the amounts 0.18 g and 0.24 g and L-tryptophan in the amounts 0.05 g and 0.06 g per head daily does not reduce the productivity characteristics of the animals in comparison to the control group.
Keywords: young minks, synthetic irreplaceable amino acids, productivity.