UDC 636.234.1.034
DOI 10.36461/NP.2026.78.2.002
PRODUCTIVITY OF HOLSTEIN COWS DEPENDING ON HOUSING SYSTEM AND LEVEL OF GENETIC EVALUATION FOR LONGEVITY
E.N. Suntsova, Postgraduate;
E.M. Kislyakova, Doctor of Agricultural Sciences, Professor
Udmurt State Agricultural University, Izhevsk, Udmurt Republic,
e-mail:
Productive longevity of cows is a key factor in the efficiency of dairy farming. Current research is aimed at analyzing the productivity of Holstein cows depending on the housing system and the level of genetic evaluation for longevity. The research was carried out at the Kalinina Agricultural Production Cooperative in the Debessky District of the Udmurt Republic. For the experiment, the cows were grouped according to their housing system, as well as to their genomic evaluation for productive longevity. It was observed that cows under free-stall housing had a 305-day milk yield advantage of 648 kg compared to those under tie-stall housing (P ≥ 0.999). The tie-stall housing system increased the productive lifespan of the cows by 12.1 months. The lifetime milk yield of cows under tie-stall housing was 5171.2 kg higher (P ≥ 0.999). Gynecological diseases were the primary cause in both housing systems. Under the tie-stall system, the proportion due to these diseases was 12.2 % higher. Correlation analysis between the genetic evaluation for longevity and productivity indicators revealed that cows with the highest evaluation significantly surpassed those with a negative evaluation in age by 19.9 months and in lifetime milk yield by 11377.2 kg. Cows with a negative evaluation, had predominantly udder, gynecological, and limb diseases. Most animals with a positive genetic evaluation had gynecological diseases, whereas cows with the highest evaluation in the lowest proportion suffered from udder diseases.
Keywords: productive longevity, genetic evaluation, milk yield, housing system, reasons for breeding, lifetime productivity.
Publication information View article