Level estimation of metabolic parameters in the glucose tolerance test (GTT) of young bulls

The metabolic parameters of the glucose tolerance test are suitable for an additional recommendation for the valuation of the breeding bulls before the start of the offspring's test could be given. Very important is the level of glucose half live to the begin of lactation of the cows. The other limit is the hyperglycemias greater than 10 mmol / 1 ( or 180 mg / dl) in the glucose level in the blood. The glucose half live measured nearly 48 minutes is comparable in the 8(th) week post partum in lactation of cows with the young bulls in the age one year. Their combination with the pedigree breeding value is leading to increase of information, that could be utilised to the selection of improper bulls if the present results were confirmed.