массовая доля жира

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

Submitted by red on Sun, 12/06/2022 - 15:36

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

Submitted by red on Sun, 12/06/2022 - 15:21

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.

The comparative characteristic of the milk quality indicators at the breeding farms of the Totemskiy district in the Vologda region (taking into account the seasonality)

Submitted by red on Sat, 11/06/2022 - 21:14

The article presents the results of studies devoted to the milk quality indicators: mass fat fraction, mass protein fraction, mass fraction of solids non fat, somatic cells in modern breeding farms of the Totem district in the Vologda region. In 2019 the quality milk indicators were determined from cows in the “Rodina” SPK (collective farm), the “Totemskiy” SPK and the “Velikodvorye”collective farm. Based on the data obtained the research was formed, the comparative characteristic of the milk quality indicators was carried out taking into account the season of the year.

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

Submitted by red on Mon, 27/04/2020 - 09:39

 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

Milk quality of Ayrshire breed cows (Prilutsky type) depending on a season and a keeping way

Submitted by red on Thu, 14/02/2019 - 15:25

The article presents the results of the season study influencing the on the milk quality of Ayrshire breed cows (Prilutskiy type). It is established that regardless of the keeping cows the protein and fat content in milk of Ayrshire breed cows (Prilutskiy type) at the «Agrofirma Red Star» tends to decrease in summer. Regardless of the season the somatic cell indicators in cow’s milk are lower in 1.73-2.03 times when loose housing and milking in the parlor compared with the tethered housing and milking in the stalls.

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

Submitted by red on Thu, 14/02/2019 - 15:20

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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