Multipurpose evaluation of the dairy cattle

Genetic Evaluation of Dairy Cattle in Canada

The calculation and publication of all dairy cattle genetic evaluations in Canada is the responsibility of Canadian Dairy Network (CDN). An 8-member board of directors, the majority being dairy producers, governs this non-profit national organization. Member organizations include all breed associations, milk recording agencies and artificial insemination centres across Canada as well as Dairy F...

Arteriographic Evaluation of Laminitis Digits in the Hind Limbs of Dairy Cattle

Objective: Laminitis is one of the main causes of lameness in dairy cattle. In this situation the corium blood circulation is disrupted and the production of healthy horny hoof wall is reduced. The purpose of this study was to evaluate the arteriographic pattern of the digital arterial branches in the laminitic digits and to compare them with the normal digits. Design: Original study. Animals...

Effect of pregnancy on the genetic evaluation of dairy cattle.

We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bul...

Impacts and Evaluation of Subclinical Hypocalcemia in Dairy Cattle

The initiation of lactation in dairy cattle requires a coordinated increase in supply of calcium to the mammary gland as part of the homeorhetic shift from supporting the demands of pregnancy to those of lactation (Bauman and Currie, 1980). The increase in release of calcium stored in bone, increase in absorption of calcium from the diet, and decrease in excretion of calcium at the kidney must ...

Evaluation of Dairy Cattle Breeding Programs: Specialized Milk Production