Evaluation of the Breeding Value of Stud Bulls of Different Lines Used in Breeding Enterprises of the Oryol Region

Samusenko, L.D.

doi:10.17238/issn2587-666x.2020.2.70

Cited by 2 publications

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“…Задовільні показники якості молока забезпечувалися генетичними задатками та високим рівнем годівлі корів. Добре відомо, що якщо удій корів більшою мірою залежить від паратипових чинників і лише на 25% зумовлений генетичними чинниками, то склад молока більшою мірою пов'язаний з генетичними можливостями (Kuian, 2011;Kochev et al, 2012;Samusenko & Khymycheva, 2012;Jumaguzin et al, 2018). Висновки 1.…”

Section: обговоренняunclassified

Level of milk productivity in Holstein cows of different ages within intensive milk production technology

Kapshuk¹

2020

TAVM

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The level of milk productivity in cows and intensity of herd reproduction, which is functionally dependent on it, are the most important components of the integrated value of the volume and efficiency of milk production, both in a separate farm or industrial complex and at the regional level. Special feature of dairy cattle breeding is that the production of the main product and reproduction of productive livestock is carried out at the expense of the parent herd. Therefore, studying cows' productive longevity and reducing the herd restoring percentage is a very urgent problem. The study was conducted on the basis of the dairy complex for the milk production by Holstein cows of the private joint-stock company «Agro-Soyuz» of Dnipropetrovsk region. Manifestation level of the genetic milk productivity potential of highly productive Holstein cows from the first to the fourth lactation (1st, 2nd, 3rd, 4th experimental groups) under the conditions of intensive milk production technology was determined. It includes three times daily milking (two times before the beginning of dry period), absence of active exercise; rest in the box where sand acts as a litter; stimulation of heat period and synchronization of ovulation, starting from day 17 after calving according to the «Ovsynch» scheme; dry period starts from 234 days of pregnancy. It was found that the maximum manifestation of the milk productivity genetic potential for full lactation in the first-calf cow is 15 632 kg of physical milk, while this indicator in animals of other experimental groups did not rise to 14 000 kg of milk. The functional activity of the body was determined by the maximum daily milk yield and milk productivity coefficient. The highest daily milk yields were shown by the cows of the second lactation, while the maximum milk productivity coefficient was in animals of the first lactation. Cows of 3rd and 4th groups in terms of milk productivity coefficients were inferior to the first-calf cows by 4.5 and 3.5 kg, respectively. The milk fat content in cows from the first to the third lactation did not decrease below 3.8%, but in the technologically depleted cows of 4th group this indicator decreased to the level of 3.79%. In cows of the first three lactations, production was characterized by a sufficient level of milk protein content -3.22%, while animals of 4th group were inferior to younger ones by 0.04% in terms of milk protein content.

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Section: обговоренняunclassified

Level of milk productivity in Holstein cows of different ages within intensive milk production technology

Kapshuk¹

2020

TAVM

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“…В качестве лучших мировых и отечественных практик используются методы, основанные на генетической характеристике животных, а также методов популяционного моделирования селекционного процесса [9]. Многие исследователи утверждают, что оценка племенной ценности животных методом BLUP наиболее полно характеризует ценность особей на генетическом уровне, поэтому способствует достоверной передаче наследственных качеств потомству [10][11][12].…”

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Effectiveness of determining the breeding value of bulls depending on the assessment method

Ivanova

2024

Bulletin of KSAU

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The purpose of the study is to determine the effectiveness of various methods for assessing the bree-ding value of bulls in the dairy cattle population of the Omsk Region. Objectives: to compare the effectiveness of assessing the breeding value of stud bulls using the “assessment by quality of offspring” and BLUP methods; to determine the correlation between the breeding value of bulls and the level of productivity of offspring. The object of the study was 67 bulls who were the fathers of 926 cows that completed their first lactation. The breeding value assessment using the Daughters-Peers method was carried out for 15 stud bulls. Of the bulls assessed using the Daughters-Peers method, 9 bulls were improvers, which is 60 % of all animals tested using this method. Using the BLUP method, from all bulls, positive breeding value was identified in 12 bulls, which is 17.9 % of the total number of bulls. When assessed by the Daughters-Peers method, the maximum number of bulls (33.33 %) have a breeding value for milk yield of 301–450 kg. The results of the BLUP assessment showed that 4 bulls, or 33.33 %, had a breeding value of less than 150 kg. The share of bulls with a breeding value of more than 451 kg is 25 %. The probability of error when selecting bulls with the best breeding value in terms of milk production is higher when it is determined by the Daughters-Peers method by 34 % compared to the BLUP method. When selecting bulls based on milk fat content, the assessment of breeding value using the BLUP method is more effective. The accuracy of the method is 47.7 % higher than when assessing breeding value using the Daughters-Peers method. Assessment using the BLUP method objectively and relatively accurately makes it possible to determine the genetic potential of animal productivity and optimally use them in breeding work.

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Evaluation of the Breeding Value of Stud Bulls of Different Lines Used in Breeding Enterprises of the Oryol Region

Cited by 2 publications

References 0 publications

Level of milk productivity in Holstein cows of different ages within intensive milk production technology

Level of milk productivity in Holstein cows of different ages within intensive milk production technology

Effectiveness of determining the breeding value of bulls depending on the assessment method

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