Selection and genetic parameters in the selection of dairy cattle

УДК 636.08.003
Abstract: 

Studies were conducted to study the variability and correlation of indicators of dairy productivity of cattle in the conditions of breeding enterprises of the Omsk region, as well as the optimal size of the breeding group was determined on the basis of the Pareto diagram. It was found that the coefficient of variation of milk yield in cows of the red steppe breed was 23.4 %, which is 4.3% more than in cows of the black-and-white breed. To form breeding groups in breeding farms in the region, they must have a milk yield of at least 7000 kg of milk. Among the available livestock, the specific weight of animals of the desired quality is 6 % for the red steppe and 6.6% for the black-and-white breeds.

Selection and genetic parameters in the selection of dairy cattle

УДК 636.08.003
Abstract: 

Studies were conducted to study the variability and correlation of indicators of dairy productivity of cattle in the conditions of breeding enterprises of the Omsk region, as well as the optimal size of the breeding group was determined on the basis of the Pareto diagram. It was found that the coefficient of variation of milk yield in cows of the red steppe breed was 23.4 %, which is 4.3% more than in cows of the black-and-white breed. To form breeding groups in breeding farms in the region, they must have a milk yield of at least 7000 kg of milk. Among the available livestock, the specific weight of animals of the desired quality is 6 % for the red steppe and 6.6% for the black-and-white breeds.

Influence of degrees of inbreeding on the economic and useful qualities of dairy cattle

УДК 636.2.034
Abstract: 

Studies were conducted to determine the relationship between the method of breeding, the reproductive qualities of heifers and their subsequent milk productivity in the conditions of enterprises of the Omsk region. It was found that the best characteristics of reproductive qualities are heifers with an inbreeding coefficient of up to 6.25% or with moderate inbreeding and inseminated from 13 to 18 months of age. With increasing homozygosity of organisms, the level of milk productivity decreases. Outbred first-born heifers inseminated before 18 months of age exceed inbred female peers in milk yield by 350 kg or 5.96 %.

Influence of degrees of inbreeding on the economic and useful qualities of dairy cattle

УДК 636.2.034
Abstract: 

Studies were conducted to determine the relationship between the method of breeding, the reproductive qualities of heifers and their subsequent milk productivity in the conditions of enterprises of the Omsk region. It was found that the best characteristics of reproductive qualities are heifers with an inbreeding coefficient of up to 6.25% or with moderate inbreeding and inseminated from 13 to 18 months of age. With increasing homozygosity of organisms, the level of milk productivity decreases. Outbred first-born heifers inseminated before 18 months of age exceed inbred female peers in milk yield by 350 kg or 5.96 %.

Technological aspects of increasing the productive longevity of dairy herds

УДК 636.2.034
Abstract: 

The research has been carried out to establish the duration of productive use of breeding stock in the breeding farms of the Omsk region. As far as the productive use duration, the cows kept in free stall housing are found to have a significant advantage compared to the tied cows, the difference being 177 days or 17.2 %. A negative correlation has been established between the abundance of milk and the duration of productive use of cows in tied herds.

 

Technological aspects of increasing the productive longevity of dairy herds

УДК 636.2.034
Abstract: 

The research has been carried out to establish the duration of productive use of breeding stock in the breeding farms of the Omsk region. As far as the productive use duration, the cows kept in free stall housing are found to have a significant advantage compared to the tied cows, the difference being 177 days or 17.2 %. A negative correlation has been established between the abundance of milk and the duration of productive use of cows in tied herds.

 

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