Selection and genetic parameters of productive traits and exterior features of black-and-white cattle in Western Siberia

The article presents materials on the selection and genetic indicators of black-and-white cattle. The amount of repeatability allows for selection by productive qualities already in the first lactation. There was a significant negative moderate relationship between the mass fraction of fat and milk yield for 305 days of lactation (- 0.308; Р>0,999). There is a tendency of negative weak dependence between the milk yield and the mass fraction of protein, namely, the increase in milk yield is accompanied by a slight decrease in protein content.

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

Economically useful characteristics of Holsteinized black-and-white cows and correlations between them

The analysis of interdependence between productivity and the A system parameters of a linear exterior evaluation among the daughters of bull-producers of different origin suggests a practical need in exterior evaluation and its interdependence with productivity in a separate herd under specific natural and economic conditions. The revealed high correlation coefficients between the main economically useful characteristics in the offsprings of foreign breeding producers indicate that the selection of any characteristic will have a positive impact on other ones.

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