Dynamics of quality indicators of cow milk by seasons

Prolonged Holsteinization led to the absorption of the domestic dairy black-and-white Holstein breed. Currently, the widespread use of bulls of various Holstein breeds continues and the study of their effect on the productive qualities of daughters is relevant and has practical significance. It was found that the daughters of the Brandy bull were obtained by outbred selection, and the daughters of the Bourbon and Dancer bulls have an inbreeding level of 0.47-0.39, which allows them to be classified as a group with a moderate inbreeding degree. The daughters of all bulls showed high milk yields in 305 days of the first lactation. In terms of milk quality, they exceeded the standard requirements. The highest productivity indicators - milk yield for 305 days of lactation were found in cows - daughters of the Brandy bull - 9825.7±927.14 kg, which is 502.7 and 473.3 kg more, or 5.1 and 4.8%, respectively, for groups of daughters of other bulls. The evaluation of milk physical and chemical parameters confirmed the superiority in nutritional and biological value of the product obtained from the daughters of the Dancer bull. It had more dry matter and fat in milk, which led to an increase in nutritional value.

Section: Introductionmentioning

confidence: 99%

Comparative assessment of the daughters of servicing bulls of foreign breeding on dairy productivity

Gorelik,

Razhina,

Sharavyev

et al. 2024

“…In addition, beef is obtained from cattle, meat that is in high demand among the population of the country. Dairy cattle of black-and-white, Holstein and other breeds are mainly used for this purpose [1][2][3]. Until 2021, the main livestock of dairy cattle was represented by black-and-white breed animals, which were improved for a long time using the global gene pool of Holstein bulls.…”

Section: Introductionmentioning

confidence: 99%

The effectiveness of growing repair heifers-daughters of different servicing bulls

Gorelik,

Kharlap,

Pavlova

et al. 2024

Since 2021, the Sverdlovsk region has switched to the cultivation and use of dairy cattle of the Holstein breed, obtained as a result of long-term use of the global gene pool of Holstein bulls. Evaluation of the effectiveness of rearing repair heifers from different servicing bulls is relevant and has practical significance. As a result of the conducted research, it was found that repair heifers increased their live weight with age, which by the age of 18 months reached from 508.0 kg (daughter of Thunderlight bull) to 529.3 kg (daughter of Seiner bull). The daughters of the Seiner bull have a higher growth rate. The daughters of the Thunderlight bull had lower live weight indicators for growth periods. The patterns of change in the average daily body weight gains in heifers-daughters of the evaluated servicing bulls were the same and corresponded to the general patterns of animal growth and development. The cultivation of repair young animals on the farm is profitable at a profitability level of 16.5-21.6%. Thus, the servicing bull has an impact on the growth and development of repair heifers, daughters, who are used to renew the herd. They differ in their features, despite the general patterns of growth and have different growth rates.

“…Milk and the main amount of beef are obtained from dairy cattle. The main livestock of the dairy herd of the Sverdlovsk region is represented by the Holstein breed, obtained as a result of long-term crossing of queens of the black-and-white breed of the Ural offspring with servicing bulls of the Holstein one [1][2][3]. These are highly productive, large animals with differences in economically useful and biological parameters from the original breeding stock.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the productive qualities of Holstein dairy cattle

Gorelik,

Kharlap,

Pavlova

et al. 2024

Sverdlovsk region is one of the leading regions in milk production. The main livestock of dairy cattle is represented by the Holstein breed, obtained as a result of long-term use of the global gene pool of Holstein servicing bulls. The assessment of the productive qualities of dairy cattle of the Holstein breed, including consideration of linear origin, is relevant and has practical significance. As a result of the conducted research, it was found that the farm is dominated by the number of cows of the Vis Back Ideal line, which account for more than 65.8% of the total number of cows. There is an unreliable insignificant difference in favor of cows of the Reflection Sovering line between groups of animals of different genealogical lines for the first and third lactation. With age, there is a decrease in milk quality indicators, such as FMF and PMF in milk from cows of all genealogical lines, which confirms the natural negative relationship between milk yield and milk quality indicators. The absorption of dairy black-and–white cattle of the domestic breed by the gene pool of the world’s most abundantly dairy breed, the Holstein, led to an increase in milk yields and the milk yield coefficient of these cows is much higher than 1000 kg. Despite the fact that the difference in milk yield is unreliable and the variation of the trait within each group along the line is quite significant, this is indicated by indirect traits such as the coefficient of milk production, milk yield for full-age lactation, etc., origin affects the productive qualities of cows.