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Pregnant mares had slower glucose clearance and greater insulin secretion at 28 weeks of gestation than did nonpregnant mares. Glucose and insulin responses to meal feeding, particularly with HS feed, were greater in pregnant mares, indicating that pregnancy enhanced the postprandial glycemic and insulinemic effects of starch-rich feed supplements.

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2 SummaryThe nutrient composition of pastures is described in relation to seasonal patterns of temperature (TP) and day length (DL). The seasonal patterns of TP and DL can be accurately characterized with a simple sine wave equation. The four parameters of the sine wave equation provide usable information about the variable being examined. Crude protein (CP), digestible energy (DE), and non-structural carbohydrates (NSC) peaked in the spring and fall months and acid detergent fiber (ADF) and neutral detergent fiber (NDF) peaked in the summer and winter months. Horse owners can utilize descriptions of the seasonal patterns in forage nutrient composition to avoid high NSC contributing to metabolic disorders such as laminitis or to take advantage of high CP for broodmares in early lactation and growing foals.Keywords: nutrition, day length, temperature, pasture composition, Virginia

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