Correlation relationships of economic characteristics in black-and-white cattle

УДК 636.082.12
Abstract: 

The present study has been carried out for obtaining comparative correlation data between productive and reproductive characteristics of the daughters of domestic and foreign breeding bulls in the modern black-and-white population of the Vologda region. The research is based on the works of domestic and foreign scientists and information databases on 10250 black-and-white cows of the 1st calving in the Vologda breeding farms. The statistical data has been calculated in the Microsoft Excel program. A comparative analysis has revealed a slight, but reliable (P<0.001) superiority of the daughters of foreign breeding bulls according to the average indicators of economic characteristics under study. The correlation coefficient calculation between the productivity and reproduction characteristics has showed the same relationship trend in the daughters of both domestic and foreign bulls. The correlation analysis has showed a great importance of animal development when raising black-and-white cattle. The live weight at the first successful insemination positively correlates with productive and reproductive characteristics. This type of relationship is noted both in the descendants of domestic bulls and in the daughters of foreign ones. The 305-lactation-day milk yield (P < 0.001) is proved to correlate with the service period (r = 0.13-0.18) and the live weight at the first successful insemination (r = 0.10-0.13) positively and reliably. The mass fraction of fat (P≤0.05-0.001) correlates with the mass fraction of protein in milk (r = 0.20-0.22), age and live weight at the first successful insemination (r = 0.03-0.16) positively and reliably. The obtained correlation research results between the productive and reproductive characteristics of the daughters of domestic and foreign bulls can be used for improving the breeding effectiveness in the modern black-and-white cattle.

Desk02 theme