E3S Web of Conf.
Volume 222, 2020International Scientific and Practical Conference “Development of the Agro-lndustrial Complex in the Context of Robotization and Digitalization of Production in Russia and Abroad” (DAIC 2020)
|Number of page(s)||5|
|Section||Modern Directions of Highly Productive Environmentally Friendly Agro- and Water Management, Development and Implementation of Systems for the Rational use of Modern Chemical and Biological Protection of Agricultural Plants and Animals, the Use of New Drugs, Growth Agents, Antidepressants, Immunostimulants, Probiotics and Feed Additives|
|Published online||22 December 2020|
Selection of dairy cattle for mastitis resistance by somatic milk cells as a system of biological protection against lacteous gland diseases
Petrozavodsk State University, Institute of Biology, Ecology and Agricultural technologies, 185910 Lenin str. 33, Petrozavodsk, Russia
* Corresponding author: firstname.lastname@example.org
The problems of methodology and organization of selection of dairy cattle for resistance to mastitis by somatic cells of milk were studied. The necessity is justified and the procedure for converting the number of somatic cells (NSC) into a points score (PSNSC) is presented. The article provides evidence of the correspondence of the cows distribution curve by points for NSC to the Gauss curve, which is a sufficient reason to consider the NSC points score as a biometrically correct objective selection trait. Procedures for determining the indices of breeding value of bulls and their breeding categories by somatic cells in points are proposed. Requirements for the level of resistance in the cows and bulls selection are developed. The most resistant to mastitis are cows with a score of 3.9 points or less, and bulls with a breeding value index of -1.012 or less.
© The Authors, published by EDP Sciences, 2020
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