The relationship between the value of milk productivity, the content of fat and protein in milk by mass with the indicators of culling cows

Relevance . Animals are culled for various reasons. There is a high proportion of veterinary causes in general and individual diseases in particular. Methods . The object of the study was information extracted from the database of the IAC “SELEX. Dairy cattle”, concerning the culling of 37,344 cows. The analysis was performed in the context of nosologies: obstetric and gynecological (OGD), internal non-infectious (INCD), surgical (SD), infectious and invasive (IID). Results . Cows culled as a result of OGD were characterized by the following maximum values: milk yield for the last completed and maximum lactation, as well as for their 100, 200 and 305 days; fat mass fraction for the completed lactation and its 305 days, as well as for similar periods of the last completed and maximum lactation; protein mass fraction for the completed lactation; yield milk fat and protein for the last completed and maximum lactation, including for 305 days of lactation. The animals that were eliminated due to INCD differed in the maximum values: the mass fraction of protein for lactation, the last completed and maximum lactation, including for their 305 days. Individuals culled due to SD had the highest values: the mass fraction of fat for the last completed and 305 days of the last completed lactation and for 305 days of maximum lactation. Cows that were eliminated due to IID had the maximum milk yield values for all studied periods; the yield of the mass fraction of fat and protein for completed lactation, including for 305 days; the coefficient of lactation stability for all studied. The minimum values of the studied indicators, characteristic of animals eliminated as a result of certain groups of nosologies, have also been established.