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The prognosis and the effectiveness of selection under different practices
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| Author:
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VLADIMIR MAZUROV, SANOVA ZOYA
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| Abstract:
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Research has been carried out and a forecast of the efficiency of selection for different methods in dairy cattle breeding has been given. The results of evaluating the selection of breeding bulls in herds of different breeds are presented. The author describes the bulls that are assigned to the breeding stock, and suggests the basic principles of their selection. It is noted that out of 9 bulls assigned to cows and heifers in the herd, five bulls are evaluated for the quality of offspring and are improvers of milk yield, fat and protein content in milk, four of the 9 are evaluated by genome and have an NTM index from +22 to +28. When getting the next generation of shvedish red cows, you need an improving selection of bulls-producers: Hammer 99492, Helix 99566, Wilde 99584, Tuomi 46003, Sampo 99426, Justice 99790, Feton 47171, Fabu 99958, Frieze 47558. For use in a herd of young, unverified bulls by the quality of their offspring, a forecast of their breeding value in terms of milk productivity according to the pedigree index (PI) is made. The range of evaluated characteristics has been expanded-from milk productivity and reproductive qualities, to health indicators (longevity, somatic cell content in milk) and evaluation of animal body type (exterior). The results obtained will allow selection and selection of bulls and cows taking into account the genetic trend in generations, and regulate the level of intensity of the selection process in the population.
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| Keyword:
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breed, breeding stock, bulls, selection of bulls, pedigree index, productivity
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| EOI:
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| DOI:
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https://doi.org/10.31838/ijpr/2020.12.03.071
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| Download:
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Request For Article
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