PRODUCTIVE FEATURES OF HEREFORD BULLS BORN IN DIFFERENT SEASONSAND APPLICATION OF POTASSIUM IODIDE

The paper describes the research in the Altai region on breeding Hereford bulls born in different seasons and application of potassium iodide in order to prevent disturbance in metabolism. The authors explored productive features of Hereford bulls born in autumn and spring in suckling period and further breeding and fattening. The researchers selected 48 similar bulls and divided them into 4 groups: 1^st control group and 1^st experimental group of bulls born in autumn and implanted with potassium iodide (each group contained 12 animals) and 2nd control group and 2^nd experimental group of bulls born in spring and implanted with potassium iodide. On weaning, the animals received “Kaiod” tablets dosed as 12 mg pro animal in the neck subcutaneously. The authors observed that in the same conditions the bulls born in autumn consumed 6.7 % energetic units more. Consumption of digested protein in 1st control, 1st experimental and 2^nd control group increased on 28.3, 17.8 and 12.6 % when daily weight gain was 855 g. It differed from other groups on 22.9, 15.6 and 11.7 % correspondently. The researchers observed lower consumption of feeds pro 1 kilo of body weight in the 2nd experimental group on 27.7 and 20.1 % in comparison with the 1st control group and 1st experimental group. The 2^nd experimental group (winter bulls) differed on 18 and 10.5 %. The paper shows the lowest costs of 1 hundredweight of weight gain in the 2nd experimental group (on 11 %). The article makes case about the level of profitability, which was higher in the 2nd experimental group on 16.1 % than in the 2^nd control one, 32 % higher than in the 1st control group and 22.1 % higher than in the 1st experimental group.

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