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Titel of the paper: <b>Investigations into glucose tolerance test in cattle. I. Relations to stage of lactation andmilk yield</b>.Intravenous glucose tolerance test was used in 104 randomly selected milk cows to proove the influence of stageof lactation on test results. The test period enclosed the time from 8 weeks ante partum ( begin of dry period) to36 weeks post partum. In another trial the glucose tolerance test was applied in 68 first lactation cows in the timefrom 2 to 7 days post partum. The test results were correlated to parameters of milk yield of the followinglactation. The probands belong to two breeds (Friesian Dairy Cattle, SMR and Holstein-Friesian HF) TheParameters of glucose tolerance test show significant changes in the time from the dry period to the lactationcycle, which can be seen as a mean for supporting milk production. The glucose and insulin related parametersdiffer in their reaction in dependence on time of lactation. Back fat thickness as an parameter for body fatcontent shows a similar behaviour as insulin related parameters. In this context their were prooved significantcorrelation coefficients between parameters of milk yield and insulin function in the range from 0 3 to 0 6 Butthere were seen no relevant relations between glucose related parameters and milk yield datas. No substantialdifferences were established between the Friesian Dairy Cattle and Holstein-Friesian cows

Zum Glukosetoleranztest beim Rind 1. – Mitteilung: Beziehungen zum Laktationsabschnitt und zur Milchleistung