Changes in the live weight of cows with age and its impact on their productive qualities

O.V Gorelik,M.V Drobyshevsky,S.E Larionova,S.Yu Harlap,O.V Khramykh,S Knyazev,O Panfilova,O Loretts,M Tsoy,V Kukhar

doi:10.1051/e3sconf/202125408024

Abstract

In the Sverdlovsk region, holstinized black-and-white cattle of the Ural type is bred, which is represented by large, highly productive animals with a high genetic potential for productivity. The purpose of the work is to study the dynamics of live weight of cows with age and its relationship with milk productivity. In animals, there is an increase in live weight with age by 22.6 kg (from 3 to 4 lactation) – 46.2 kg (from the first to the 2 lactation) or by 3.4 – 7.9%. With an increase in live weight, there was an increase in milk yields up to 3 lactation, and then their decrease. The greatest decrease was observed in the fifth lactation. The coefficient of milk production decreases with the age of cows and is accompanied by an increase in live weight. Despite an increase in live weight and a decrease in milk yield for every 100 kg of live weight of cows, all of them turned out to be of dairy-oriented productivity. However, it should be noted that achieving a live weight of 710 kg or more leads to a decrease in the efficiency of cow use. There is a low negative relationship between live weight and milk yield of cows.

Highlights

Sustainable supply of high-quality food products, including milk, is the main necessity in ensuring the health of the nation and food security of any country [1-7]
The purpose of the work is to study the dynamics of live weight of cows with age and its relationship with milk productivity
With an increase in live weight, there was an increase in milk yields up to 3 lactation, and their decrease

Summary

Introduction

Sustainable supply of high-quality food products, including milk, is the main necessity in ensuring the health of the nation and food security of any country [1-7]. Special attention is paid to the development of dairy cattle breeding, since the main amount, more than 99% of the total production, is obtained from cattle, a valuable food product and raw material for the dairy industry – milk. The main population of dairy cattle belongs to the domestic black-and-white breed, in which the offspring are distinguished, differing in economic and biological characteristics. Large, highly productive animals having high genetic potential for productivity and well adapted to industrial milk production were obtained. They are able to show good average daily milk yields throughout lactation, produce for a long time without a sharp decrease in milk yield, but a decrease in reproductive ability was noted [22-27]. The study of the dynamics of live weight of cows with age and its relationship with milk productivity is relevant and has practical significance

Objectives

Methods

Results