The influence of hydrokeratine, vitamins U and B1 on the productive qualities of cattle replacements

The findings of scientific test, the purpose of which is to develop the norms of feeding with new fodder additives - hydrokeratine-zeolite fodder ad-ditive, vitamins U and B1 as specific growth stimula-tors for young stock, are presented. The young stock is intended for the replacement of breeding flock at dairy farms. The monitoring of feeding and animals' growth have been conducted, reproductive ability, milk composition and evaluation of milk quality and dairy bypass, economic evaluation also were being studied. The animals of the II experi-mental group fed with tested hydrokeratine-methyl methionine-thiamine fodder additive against the low milk and low concentrates ration had the concentra-tion of sulphur containing amino acids (methio-nine+cystine) 30.3 % and 10.3 % higher in compar-ison with the similar animals from the I experi-mental group (on low milk and low concentrates ration) and the control group (on high concentrates ration). These animals (II) outrun the control ones in growth energy for 10 kg or 8.6 % to the end of preweaning period. At the moment of insemination and before calving the cows (II) had the live weight gain 6.8 % and 2.9 % higher. They were produc-tively inseminated 1-2 months earlier than their herd mates and had a conception rate 0.5-1.3 times lower. The cows calved easily, without partu-rient complications and further showed evident signs of heat. The colostrum had weight content of fat 0.9 % and 0.6 % higher and of protein - 0.4 - 0.9 % higher in comparison with analogues. Their service period after calving became 7-12 days shorter. The profit increased in the II experimental group by 10 % and 2.2 times in comparison with the I experimental and control groups. Moreover, the introduction of animals into the dairy herd was accelerated by 1-2 months, 170 kg of milk and 772 kg of concentrates were saved. It is recommended to feed 0.3 g of hydrokeratine per day and 0.3 mg of vitamin U and 0.15 of vitamin B1 per kilogram of live weight per day against low milk and low con-centrates ration.