Potential associations among glucose tolerance test (GTT) as ability to metabolize glucose, estimated breeding values (EBVs) for milk traits and selected candidate gene polymorphisms were evaluated. German Holstein sires, born in 1993 and between years 1999 and 2003, were analysed. A few significant negative correlations between milk and protein yield and GTT were found in sires born in 1993. Only a few significant correlations were found for protein yield, protein percentage and for fat percentage and yield (sires born in different years). Any linkage of DGAT1, GH1, GHR, FASN and OLR1 to GTT was found. Keywords: milk, glucose, correlation, breeding values References Deepa, P.M . et al. (2015) Alteration in clinico-biochemical profile and oxidative stress indices associated with hyperglycaemia with special reference to diabetes in cattle-a pilot study. Trop. Anim. Health Prod. , Vol. 47, no. 1, pp. 103-109. DOI:10.1007/s11250-014-0691-5 Di Stasio, L. et al. (2005) Polymorphism of the GHR gene in cattle and relationships with meat production and quality. Anim. Genet. , Vol. 36, pp. 138–140. Grisart, B. et al. (2002) Positional candidate cloning of a QTL in dairy cattle: Identification of a missense mutation in the bovine DGAT1 gene with major effect on milk yield and composition. Genome Res., Vol. 12, pp. 222-231. Kneeskern, S. G . et al. (2016) Effects of chromium supplementation to feedlot steers on growth performance, insulin sensitivity, and carcass characteristics. J. Anim. Sci. , Vol. 94, no. 1, pp. 217-226. DOI: 10.2527/jas2015-9517 Khatib, H. et al. (2006) Association of the OLR1 Gene with Milk Composition in Holstein Dairy Cattle. J. Dairy Sci. , Vol. 89, pp. 1753–1760. Morris, C. A. (2007) Fatty acid synthase effects on bovine adipose fat and milk fat. Mamm. Genome , Vol. 18, pp. 64–74. Panicke, L. et al. (2000) Relationships between parameters of the glucose tolerance test by young sires and estimated their breeding values. Arch. Tierz. , Vol. 43, pp. 231-239.