title: [Effect of food intake on variations in different plasma constituents at the end of gestation and the start of lactation].
abstract: Four dairy cows received a diet mainly constituted of a mixture of 60% maize silage and 40% concentrate, within four weeks before and six weeks after calving. During this period, blood samples were taken from the jugular vein, twice a week, before and two hours after the morning meal. Five plasmatic components were analyzed: glucose, non-esterified fatty acids, beta-hydroxybutyrate, acetate and urea. Prandial variations depend on the physiological stage: the post-feeding decrease in concentration of non-esterified fatty acids is very slight during late pregnancy and important during early lactation; concentration of beta-hydroxybutyrate post-feeding increases during late pregnancy, but not during early lactation. These results are discussed with variations of energy balance and feeding level. The correlations between different plasma components are often higher before feeding than after, especially between non-esterified fatty acids and beta-hydroxybutyrate. The concentration of non-esterified fatty acids is highly correlated with energy balance, except during the last ten days before calving.
mesh_terms: D020155:3-Hydroxybutyric Acid; D000085:Acetates / Q000097:blood; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D002417:Cattle / Q000097:blood*; D004032:Diet; D004734:Energy Metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006885:Hydroxybutyrates / Q000097:blood; D007774:Lactation; D011247:Pregnancy; D011270:Pregnancy, Animal; D014508:Urea / Q000097:blood
chemical_list: D000085:Acetates; D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D006885:Hydroxybutyrates; D014508:Urea; D020155:3-Hydroxybutyric Acid
vernacular_title: Influence de la prise alimentaire sur les variations de différents constituants plasmatiques chez la vache en fin de gestation et en début de lactation.