mass fraction of fat

Selection and genetic parameters of productive traits and exterior features of black-and-white cattle in Western Siberia

The article presents materials on the selection and genetic indicators of black-and-white cattle. The amount of repeatability allows for selection by productive qualities already in the first lactation. There was a significant negative moderate relationship between the mass fraction of fat and milk yield for 305 days of lactation (- 0.308; Р>0,999). There is a tendency of negative weak dependence between the milk yield and the mass fraction of protein, namely, the increase in milk yield is accompanied by a slight decrease in protein content.

The comparative characteristic of the fat content of milk in cows, taking into account the season of the year

In dairy farming, when breeding dairy breeds of cattle, milk quality is an important factor, milk fat content in particular. According to the results of the research, on 3 farms of the Vologda region for the period from 2017 to 2019, taking into account the season of the year and basing on the comparative characteristics, high values of the mass fraction of fat in milk samples of cows have been revealed in autumn. On average, the farms have established high quality values of the mass fraction of fat that meet the state standard requirements.

Dynamics of dairy cattle breeding development in the European North of the Russian Federation

 The article presents the research results on the quantitative and

qualitative characteristics of dairy cattle populations and breeding farms in the European

North of the Russian Federation. Nowadays, taking into account the current political and

economic situation of the livestock sector management, the problem of preserving the

number of dairy cattle breeds and increasing cow’s milk productivity is quite pressing.

     In the European North of the Russian Federation, there has been found the

Changes in Milk Productivity Using the Feed Concentrate “Urga” in the Diet of Highly Productive Cows

The results of research in milk productivity of lactating cows using the feed concentrate “Urga”, products of the EM series (LLC “EM-cooperation”) were analyzed. The received the feed concentrate “Urga” animals had higher monthly milk yield, the amount of milk produced in terms of base fat and protein, higher level of realization of productive capacity, which pointes out the feasibility in developing a feeding program and increasing the efficiency of milk production.

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