Воспроизводительные качества красно-пестрых коров
TL;DRAbstract
In comparison with the Simmental breed were better on a yield of milk of the first heifer from 62,5% and more of blood of Holstein breed. First heifers were the worst on a yield of milk on belonging to line of W.B.Ideal, they have the lowest variation of a yield of milk. Duration service period was higher than optimum in all presented groups, this indicator was very big variability. Increase of level blood of Holstein breed (except 1/4) the age of the first insemination increased, but is disproportionate, thus wasn't observed adequate increase in efficiency. Coefficients of regression showed that at increase a yield of milk at one thousand kg the service period duration at cows of a different blood level of Holstein breed will ambiguously change, steadier appeared in cows of high blood levels on Holstein breed.
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In comparison with the Simmental breed were better on a yield of milk of the first heifer from 62,5% and more of blood of Holstein breed. First heifers were the worst on a yield of milk on belonging to line of W.B.Ideal, they have the lowest variation of a yield of milk. Duration service period was higher than optimum in all presented groups, this indicator was very big variability. Increase of level blood of Holstein breed (except 1/4) the age of the first insemination increased, but is disproportionate, thus wasn't observed adequate increase in efficiency. Coefficients of regression showed that at increase a yield of milk at one thousand kg the service period duration at cows of a different blood level of Holstein breed will ambiguously change, steadier appeared in cows of high blood levels on Holstein breed.
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