воспроизводство

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

Submitted by red on Sat, 11/06/2022 - 22:31

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.

Rating assessment of breeding bulls of the Kholmogorskaya breed in terms of reproductive indicators in foreign and domestic breeding

Submitted by red on Sat, 11/06/2022 - 21:39

The article presents the results of rating assessment of breeding bulls of the Kholmogorskaya breed in terms of reproductive indicators in foreign and domestic breeding in the North-West zone of the Russian Federation. The studies were conducted on the basis of a rating developed in the Northwest Research Institute of Dairy and Grassland Economy. 765 daughters of 18 domestic breeding bulls and 14 of foreign breeding bulls were observed. The rating of breeding bulls is established on reproductive signs of daughters.

Analysis of health condition, milk production and reproduction of cows when using in rations food additives based on needles

Submitted by red on Fri, 12/04/2019 - 09:47

In order to increase the productivity of dairy cows and maintain their health, the search for complex food additives with multifactorial positive properties is continuously carried out. A scientific and economic experiment of a new food additive based on needles developed by the technical and research centre “Khiminvest” has been conducted. The experiment has been conducted by the method of groups-analogues on highly productive cows.

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