The effect of immunogenetic factors on productive longevity and reproductive qualities of cows
| Autor: | Evgeny Ivanov, Vera Tereshchenko, E. V. Gatilova, Lyubov Valentinovna Efimova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
media_common.quotation_subject lcsh:QR1-502 Biology Industrial and Manufacturing Engineering lcsh:Microbiology lcsh:Physiology Fertility index 03 medical and health sciences Animal science Milk yield Antigen Lactation lcsh:Zoology medicine lcsh:QL1-991 Dairy cattle 030304 developmental biology media_common 0303 health sciences lcsh:QP1-981 0402 animal and dairy science Longevity 04 agricultural and veterinary sciences 040201 dairy & animal science medicine.anatomical_structure |
| Zdroj: | BIO Web of Conferences, Vol 27, p 00072 (2020) |
| ISSN: | 2117-4458 |
| Popis: | Increasing the productive longevity of cows with high reproductive ability is an urgent task in dairy cattle breeding both in Russia and foreign countries. Research was conducted in Krasnoyarsk region. The object was retired cows (n = 484). The blood groups of cows, indicators of productive longevity, and reproductive ability of cows were studied. The number of antigen carriers and non-carriers (frequency 30.0% and more) was analyzed. Out of 21 antigens with a frequency of more than 30.0%, the most frequently encountered antigens were E (80.6%), H` (77.5%), L (58.5%), W (57.6 %), A2 (57.0%), Z (54.1%), C (52.5%) and X2 (50.4%). The cows carrying O1 antigen had the highest productive longevity, – the difference from the cows not carrying this antigen by the retirement and lactation age was 0.8 years (p |
| Databáze: | OpenAIRE |
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