Milk productivity of first-calf cows depending on the intensity of their breeding
https://doi.org/10.26898/0370-8799-2021-6-9
Abstract
The paper presents the results of studies of milk productivity of black-and-white cows depending on the age of the first insemination and live weight at the first calving in the conditions of the Irkutsk region. The dynamics of heifer rearing by year, milk productivity of cows in the 1st and 3rd lactations depending on the intensity of their development has been studied. The experiment was conducted on farm materials from the Irkutsk Region using generally accepted zootechnical, analytical, variation and statistical research methods from 2016 to 2020. Live weight of heifers at all ages met the requirements of the elite and elite-record classes. Analysis of the data showed that the growth rate of the animals increased during 5 years (6.0%, 6.8, 2.3 and 4.8% respectively with a significant difference p ≥ 0.90). With the increased intensity of heifer rearing, an increase in milk yield over 305 days of the first lactation was observed. The highest milk production was noted in the 1st (5309-5476 kg) and 3rd (5418-5817 kg) lactations in cows with the first fruitful insemination at 13-14 months. The lowest 1st and 3rd lactation yields are obtained from cows inseminated at 20 months of age or older. Higher milk production in the first and third lactations was obtained from cows with a live weight at first calving of 541-550 kg, 551 kg and higher (5197-5164, 5436-5545 kg respectively). Less milk production was obtained from cows with a live weight at first calving of up to 500 kg (4567-5122, 4943-5009 kg). The results obtained make it possible to reveal the influence of the intensity of rearing heifers on the productive qualities of cows.
About the Author
L. L. Petrukhina
Irkutsk Research Institute of Agriculture – Branch of the Irkutsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Lydia L. Petrukhina, Researcher
14 Dachnaya St., Pivovarikha village, Irkutsk district, Irkutsk region, 664511
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Review
For citations:
Petrukhina L.L. Milk productivity of first-calf cows depending on the intensity of their breeding. Siberian Herald of Agricultural Science. 2021;51(6):77-83. https://doi.org/10.26898/0370-8799-2021-6-9
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