Аннотация
The paper shows the results of testing a new premix developed by scientists of the North Kazakhstan University named after M. Kozybayev. The aim of the study was to determine the effectiveness of the new premix compared to the manufactured P-60-1. For this purpose, 3 groups of heifers of 10 heads were formed (1 – control, 2 group – diet with premix PSVM-1, 3 group – PSVM-2). The inclusion in the concentrate part of the silage-hay-hay rations of heifers instead of the premix P-60-1 produced by the feed industry, the premixes PSVM-1 and PSVM-2 developed by us allowed us to increase the concentration in the dry matter of the cobalt rations to 0,49 mg, copper – to 8,60–8,67 mg, zinc – to 30,4–30,6 mg, manganese – up to 44–45 mg, vitamin A – up to 3250–3300 м.е. and vitamin D – up to 1289–1276 м.е. The milk yield of the experimental groups of animals at a probability level of p<0,05 exceeded the control by 1,5 kg per day. The content of milk fat in the colostrum of cows of group 3 increased (6,18±0,18% versus 5,13±0,16 in the control) and vitamins A and D, which is very important for the normalization of metabolism in the body of a newborn calf at a probability level of p<0,001. Enriching the diet of animals with vitamin and mineral complex allowed the heifers of the experimental groups to get more growth live weight from 72 to 140 g in the third group per day at p<0,001.