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Journal of Animal Science, Vol 75, Issue 3 781-789, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

Metabolic changes during the transition from the fed to the acute feed-deprived state in prepuberal and mature gilts

C. R. Barb, R. R. Kraeling, G. B. Rampacek and C. R. Dove
ARS, USDA, Athens, GA 30613, USA.

The present study compared the metabolic response to acute feed deprivation in ovariectomized prepuberal (P; n = 6), 62 +/- 2 kg BW, and mature (M; n = 6) gilts, 124 +/- 4 kg BW. Blood was collected at 1, 2, 3, 4, 6, 8, 12, 16, 20, 24, 28, 32, 40, and 48 h after initiation of feeding. Samples were quantified for glucose, insulin, free fatty acids (FFA), beta-hydroxybutyrate (HBA), IGF-I, IGF binding proteins (BP)-1 to -4, cortisol, and amino acids (AA). At 24 h, blood samples were collected every 15 min for 8 h and an additional 1 h after i.v. injection of GnRH (.2 microgram/kg BW) and growth hormone-releasing factor (GRF; 1 microgram/kg BW). Samples were assayed for growth hormone (GH) and LH. Serum insulin concentrations were lower (P < .05) in P gilts. Plasma glucose concentrations were similar. Serum FFA concentrations were greater (P < .05) in P gilts. Serum concentrations of HBA were greater (P < .001) in P gilts at 48 h. Serum IGF-I concentrations were lower (P < .05) in P gilts by 16 h. Serum IGFBP-1-4 levels were similar. Serum cortisol concentrations were similar. Serum concentrations of the essential AA, isoleucine, lysine, threonine, valine, and phenylalanine were greater (P < .05) in P gilts at 40 h. Serum LH concentrations and response to GnRH were similar. Basal serum GH concentrations and peak response to GRF were greater (P < .05) in P than in M gilts. The transition from fed to unfed state occurs more rapidly in P than in M gilts.


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Copyright © 1997 by the American Society of Animal Science.