Einfluss genetischer varianten der milchproteine auf milchzusammensetzung

Graml, R.; Buchberger, J.; Kirchmeier, O.; Pirchner, F.

doi:10.1186/1297-9686-12-1-131a

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“…В США при разведении крупного рогатого скота обращают внимание на повышение плодовитости, при котором оцениваются воспроизводительные качества коров и быков -производителей [4]. R. Graml, J. Buchberger, F. Pirchner [5] отмечают, что можно выявить более высокую степень наследуемости признаков воспроизводства за счет четкого сбора информации по воспроизводству, что позволит вести прямую селекцию на повышение плодовитости.…”

Section: Introductionunclassified

Cow Reproduction Features Under the Conditions of Industrial Technology of Milk Production

Velmatov¹,

Dunin²,

Tishkina³

2021

Vestnik of Ulyanovsk SAA

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Milk productivity of cows depends on the duration of the service period. Thus, with an increase of the service period from 60 to 121 days after the first calving, milk productivity of cows increases by 937 kg (P≥0.95), after the second calving - by 745 kg and after the third calving - by 926 kg (P≥0.95). Cows with a service period of less than 60 days had the lowest milk productivity of 6751 kg. Cows with a service period of more than 120 days gave 7688-8251 kg of milk. Milk productivity of cows is also influenced by the length of the dry period. Too short, as well as too long dry period has a negative effect on milk productivity. So, cows with a dry period of less than 40 days gave an average of 7011 kg of milk, with an increase of the dry period, milk productivity parameters increase. Cows with a dry period of 41-50 days produced 7465 kg, with a dry period of 51-60 days - 7785 kg, with an increase of the dry period from 61 to 70 days milk productivity increased to 8042 kg, finally, dry period of over 70 days leads to a decrease of milk productivity of cows up to 7211 kg. In terms of the calving interval, the experimental cows corresponded to the parameters of highly productive cows, being within the period of 12-14 months. The analysis of reproductive ability showed that the animals have average values for reproductive ability.

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Section: Introductionunclassified