CHARACTERISTICS OF GROWTH AND FATTENING QUALITIES OF STEERS OF DIFFERENT GENOTYPES REARED WITH INTENSIVE TECHNOLOGY
Abstract
The article presents the results of research on growing and feeding bulls of the purebred Brown Swiss breed, as well as its crossbreeds with the Hereford and Belgian blue breeds, from birth to 15 months of age in farm conditions. Analysis of the actual rations of calves during the dairy (0–2 months) and post–weaning (2–4 months) periods shows that, in terms of energy, protein and other nutritional factors, they fully corresponded to the norms of feeding calves of meat breeds to obtain an average daily increase in live weight of about 1000 mg. It should be noted that during the period of rearing and fattening, the animals were fed ad libitum, and the daily rate of the feed mixture was constantly monitored by the amount of residues on the feed table (about 5%). Our research showed that the crossbreeds bulls of the 2nd and 3rd experimental groups exceeded the increase in live weight of the bulls of the control group in terms of absolute growth in all age periods. In the period of 12–15 months of age, the difference between bulls of the Brown Swiss breed and crossbreeds from the Hereford breed amounted to 38.4 kg (35%) and crossbreeds with Belgian blue 56 kg (51%). Our studies showed that the crossbreed bulls of the 2nd and 3rd research groups in all age periods exceeded the increase in live weight of bulls in the control group in terms of absolute growth. In the period of 12–15 months of age, the difference between the bulls of the Brown Swiss breed and the crossbreed from the Hereford breed was 38.4 kg (35%), and the crossbreed with the Belgian blue was 56 kg (51%). Thus, the difference in live weight at the age of 6 months between bulls of the Brown Swiss breed and its crossbreeds with the Hereford breed amounted to 45.2 kg (24.1%), at the age of 9 months 93.3 kg (34.9%), at the age of 12 months 135.1 kg (37.5%), and 174 kg (37%) at the age of 15 months, with a significant difference. Crossbreeds of Belgian blue bulls, respectively, at the age of 6 months had the following indicators of live weight gain: 26.5 kg (14.1%), at the age of 9 months 56.4 kg (21), at the age of 12 months 100.5 kg (27%), and at the age of 15 months, respectively, 156 kg (33%) in comparison with steers of the Brown Swiss breed with a significant difference. It is also worth noting that, with age, regardless of genotype, the consumption of both energy and protein per unit of growth increased. Over the entire period of the experiment, crossbreeds animals better transformed both energy and protein into growth. This advantage over control for metabolic energy was 28.5 and 26.3%, and for crude protein, it was 28.8 and 26.8% for experimental groups 2 and 3. In order to increase the efficiency of cultivation and obtain a greater yield of meat raw materials from one head, one should focus on the cultivation of steers of the Belgian blue breed, which, according to our research, throughout all age periods was characterized by higher live weight and growth energy, which was reflected in the average daily growth.
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