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WS Effects of rumen protected arginine supplementation to cows during early or late gestation on progeny glucose tolerance
Our hypothesis was calves gestated by dams supplemented rumen protected arginine during early or late gestation would have improved glucose tolerance. In order to test this hypothesis, a two yr study was conducted. Dams were randomly assigned to one of three treatments; 1) grazing native range plus dried distillers grain (Control), or grazing native range plus dried distillers grain and Arg fed to provide 180 mg L-Arg/kg BW either during 2) early gestation (EARG) or 3) late gestation (LARG). In yr 1, 16 yearling calves (heifers n = 8, steers n = 8) and in yr 2, 24 (heifers n = 10, steers n = 14) yearling calves underwent a glucose tolerance test (GTT). On the days of the GTT, cattle were fed at 0600 h and indwelling jugular catheters were inserted at 0700 h. A 50% dextrose solution was injected at 0.5 mL/kg BW via the jugular catheter and subsequent 6 mL blood samples were collected at -5, -2, 0, 3, 6, 9, 12, 15, 20, 40, 60, 80, 100, and 120 min relative to the dextrose infusion. Glucose half-lives were estimated by regressing the logarithmically transformed glucose concentrations over time and area under the curve was determined using the trapezoidal summation method. Glucose area under the curve (AUC) did not differ (P = 0.13) between treatment groups; however, overall glucose concentration (conc.) tended (P = 0.06) to be lower for calves of arginine supplemented dams when compared with non-supplemented dams. There were no differences between treatment groups in reference to insulin AUC (P = 0.57), insulin half-life (P = 0.85), or overall insulin concentration (P= 0.47). In conclusion, rumen protected arginine supplementation to cows during varying times in gestation tends to affect overall glucose concentration in progeny during a glucose tolerance test; however, does not affect glucose or insulin AUC, half-life, or overall insulin concentration.
Keywords:
arginine, glucose AUC, glucose half-life