Milk productivity and physical and chemical milk content of simmenthal cows of different selection
The evaluation results of Simmenthal animals of different selection for weight growth, milk productivity and the physical and chemical milk content are presented in the work. It is stated that descendants of Simmenthal bulls of German selection were characterized by a higher growth rate (by 3,7-6,1%) in all age periods. Simmenthal cows of German selection surpassed herdmates of Russian selection by 265 kg (7,6%), fat and protein by 0,08% and 0,03%, respectively, and product yield by 13,6 kg (9,8%) and 10,0 kg 8.6%). The most productive were the daughters of the Khorung line bulls (9094147) of German selection. Their superiority in milk yield over descendants of the bulls of the Floriana line (374) was 803 kg, or 20,8% during the first lactation. As for the physical and chemical milk content, no significant differences were found between the animals of the initial lines.