O. G. Zaripov, P. I. Otradnov, I. N. Yanchukov
Federal Science Center for Animal Husbandry named after Academy Member L.K. Ernst, Dubrovitsy, 60, Podol’skii r-n, Moskovskaya obl., 142132, Russian Federation
Abstract. The work aimed to develop and test a phenotypic-economic indicator – the age of positive profitability (APP), reflecting the age at which the animal fully recoups raising and maintenance costs and begins to bring profits. APP was calculated over a limited life span of a cow, equal to 2100 days, as the difference between the number of days lived and the ratio of the lifetime profit brought to the average daily profit for a productive life. According to the results of the calculations based on the APP values, all animals were divided into 3 groups: “from 0 and below”, “from 1 to 2100”, “from 2101 and above”. The most effective in terms of payback rates were the cows from the “1 to 2100” group. Evaluation of the relationship between the characteristics of productivity and fertility, as well as productive longevity and the economic efficiency of animals, showed that APP was maximally dependent on life-long milk yield (r = -0.91) and duration of productive life (r = -0.57). The duration of service period and age of first calving also affected productive life. The animals that reached 4–5 lactations within the 2100 days of the study showed the maximum efficiency when the age of first calving and the duration of the service period decreased. Their payback was higher due to a higher lifetime milk yield (r = -0.58), an increase in the total number of milking days (r = -0.85) and the number of lactations over a lifetime (r = -0.49). The developed APP indicator can be used to select the most effective cows by the complex of signs of milk productivity and fertility.
Keywords: productive longevity; economic efficiency; Black-and-White cattle; cows; life-long milk yield; service period; age of first calving.
Author Details: O. G. Zaripov, Cand. Sc. (Biol.), research fellow (е-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); P. I. Otradnov, junior research fellow; I. N. Yanchukov, D. Sc. (Agr.), leading research fellow.
For citation: Zaripov OG, Otradnov PI, Yanchukov IN. [Using the indicator “age of positive profitability” to assess the effectiveness of the productive life of cows]. Dostizheniya nauki i tekhniki APK. 2020;34(8):94-8. Russian. doi: 10.24411/0235-2451-2020-10816.