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Effect of season and stage of lactation on plasma insulin and glucose following glucose injection in Holstein cattle.

Changes in plasma glucose and insulin concentrations following glucose injection in dairy cows (six per stage of lactation per season) were characterized during early, middle, and late lactation in winter, spring, and summer. Blood samples were collected 60, 45, 30, 20, 15, 10, 5, and 0 min (period 1) before glucose injection (.1 g/kg body weight) and at 5, 10, 15, 20, 30, 45, and 60 min (period 2) after injection. Plasma insulin concentrations were affected by season, period, season by period interaction, and time within period. Plasma glucose was affected by period, time within period, and stage of lactation by period interaction. Insulin was lowest in summer. Magnitude of insulin response to glucose was highest in spring. Both plasma glucose and insulin increased significantly 5 min following glucose injection. Peak glucose concentrations increased with advancing lactation. Results indicate alterations in glucose metabolism as well as changes in insulin sensitivity to glucose in various seasons and stages of lactation.