Dietary protein and(or) energy restriction in mares: plasma glucose, insulin, nonesterified fatty acid, and urea nitrogen responses to feeding, glucose, and epinephrine

• Published in: Journal of animal science Vol. 73; no. 1; p. 136
• Main Authors: Sticker, L.S. (Louisiana State University Agricultural Center, Baton Rouge), Thompson, D.L. Jr, Bunting, L.D, Fernandez, J.M, DePew, C.L
• Format: Journal Article
• Language: English
• Published: United States 01.01.1995
• Subjects: ACIDE GRAS; ACIDOS GRASOS; ADRENALINE; ALIMENTACION RACIONADA; ALIMENTATION RATIONNEE; Animals; AZUCAR EN SANGRE; Blood Glucose - analysis; Blood Urea Nitrogen; Body Weight - drug effects; Body Weight - physiology; Circadian Rhythm - physiology; Diet, Protein-Restricted - standards; Diet, Protein-Restricted - veterinary; Dietary Proteins - administration & dosage; Dietary Proteins - standards; Eating - physiology; Energy Intake - physiology; Energy Metabolism - physiology; EPINEFRINA; Epinephrine - administration & dosage; Epinephrine - pharmacology; Fatty Acids, Nonesterified - blood; Female; Glucose - administration & dosage; Glucose - pharmacology; Glucose Tolerance Test - veterinary; Horses - blood; Horses - metabolism; INGESTION DE ALIMENTOS; INGESTION DE NUTRIENTES; INGESTION DE SUBSTANCES NUTRITIVES; Injections, Intravenous; Insulin - blood; INSULINA; INSULINE; JUMENT; PESO; PLASMA SANGUIN; PLASMA SANGUINEO; POIDS; PRISE ALIMENTAIRE (HOMME); PROTEINAS; PROTEINE; SUCRE DU SANG; UREA; UREE; YEGUA
• ISSN: 0021-8812; 1525-3163
• DOI: 10.2527/1995.731136x

Sixteen light horse mares (8 to 9 yr of age; 457 to 579 kg BW) were fed Bermudagrass hay and a corn/cottonseed hull-based supplement formulated to contain either 100% (control) or 50'7c (restricted) of the protein and(or) energy requirements for maintenance in a 2 X 2 factorial arrangement of treatments. Daily measurements of intake, BW, and plasma hormones and metabolites were made for 33 d. Plasma glucose, insulin, NEFA, and urea N were measured in hourly samples drawn on d 27, and parallel with an i.v. glucose tolerance test (IVGTT) and epinephrine challenge on d 29. Energy restriction increased daily NEFA concentrations (P 0.001) and urea N (P 0.1) throughout the remaining 24 d. Normal meal consumption elevated plasma glucose, insulin, and urea N concentrations (time effect, P 0.08). Plasma NEFA concentrations did not change after feeding in mares fed control energy, but decreased in mares fed restricted energy (energy X time interaction, P