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

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.

The correlative dependence of sires gametogenesis on heliophysical factors

 There has been identified the bulls with the maximum ejaculate volume

belonging to the line Montvik Chieftain 95679, exceeding by 23,5% on this parameter

bulls of the Simmental lines. The bulls of different genotypes show a reliable negative

correlation in the main signs of sperm production with cosmophysical indicators of solar

and geomagnetic activity. The Raphael’s 3111 lines bulls have been more sensitive to

the learned factors of cosmic influence than Bravo’s 6802 line bulls. Among the Holstein

Desk02 theme