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Cows exposed to heat stress exhibit a decreased ability to mobilize lipids   due to increased sensitivity to insulin, which is expressed in a decreased   concentration of NEFA. However, certain cows can preserve the level of lipid   mobilization after adapting to heat stress. We assumed that cows that have a   preserved ability to mobilize lipids are less sensitive to insulin and that   they have a lower tolerance for glucose. The aim of this work was to compare   the results of an intravenous glucose tolerance test in cows that exhibited,   in prolonged heat stress, a decreased (NEFA<0.20 mmol/l) or preserved   (NEFA>0.30 mmol/l) ability for lipid mobilization. Glucose concentration and   NEFA concentration were measured following intravenous application of   glucose. The mean glycaemic index value did not differ statistically   significantly between the two groups of cows at 10, 15 and 20 minutes after   glucose application (p>0.05), but there was a tendency at 10 and 15 minutes   for the glycaemia to be higher in cows with preserved lipomobilization   (p<0.1). At 30, 60 and 90 minutes after glucose application, glycaemia was   statistically significantly higher (p<0.01; p<0.05 and p<0.05) in the group   of cows with preserved lipomobilization. The glycaemic index values (mmol/l)   shown in the same order (30, 60 and 90 minutes) were as follows 9.91±0.21:   9.23±0.41; 5.41±0.5: 4.67±0.33 and 4.31±0.39: 3.47±0.37. The mean value for   NEFA concentration in samples originating from the two experimental groups of   cows did not differ statistically significantly following glucose   application. The NEFA concentration showed a tendency to be higher in cows   with preserved lipid mobilization in comparison with cows with decreased   lipomobilization at 20 and 30 minutes after glucose application (p<0.1).   Following the intravenous glucose tolerance test, NEFA and glucose   concentrations were in a significant negative correlation, and that   correlation was more expressed in cows with decreased lipomobilization. Cows   with preserved lipomobilization have a lower tolerance for glucose than cows   with a decreased lipomobilization during heat stress. [Projekat Ministarstva   nauke Republike Srbije, br. TR 31062

Effect of degree of lipomobilization on results of glucose test in dairy cows in heat stress