English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The work was carried out on three-breed hybrid Simmental x Ayrshir x Holstein animals in the conditions of the Federal State Unitary Enterprise “1st May”  of Mordovia Republic. Correlation of the main economically useful traits was carried out on crossbred animals bred with different energy nutritional value of  the ration. The excess of the ration nutritional value of the test group was 7.0%. The heifers of the test group significantly exceed in terms of live weight the  analogues from the control group at the age of 6 months by 11 kg, at 12 months - by 19 kg, at 18 months - by 26 kg (P &lt;0.001). The highest milk productivity  had the cows of the test group, which gave 7543 kg of milk, which is 8.5% more than in the control group. The superiority of cows in the test group is also  preserved in terms of milk fat and protein yield, respectively, by 8.5-6.6% (P &lt;0.01). Significant differences were noted between the groups of animals in the  main exterior dimensions. As for height at the withers and sacrum, heifers from the test group exceeded their analogues from the control group by 5.7 - 6.3  cm, chest girth by 9.5 cm, oblique body length by 4.8 cm (P &lt;0.001). The study of correlation of the main economically useful traits shows a certain dependence of live weight in different periods with milk production. This relationship is clearly seen in heifers of the test group at the age from 2 to 5 months and 12-18  months. The correlation coefficient in these age periods was + 0.685 ... + 0.734, which indicates a high dependence between live weight and milk productivity.  The correlation between the main measurements of heifers and their future milk productivity was higher for heifers bred with improved feeding. It is advisable  to use this regularity in practical selection/

THE CORRELATION OF ECONOMICALLY USEFUL TRAITS AND THEIR USAGE IN PRACTICAL BREEDING