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Title:   Author  item
                                            Salfen, Brentitem
                                            Carroll, Jeffery

                                                         - *Jeff Carroll*
  Submitted to: Journal of Animal Science Supplement
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 12/13/2002
                                    Publication  Date: 3/17/2003
                                    Citation: SALFEN, B.E., CARROLL, J.A. ENDOCRINE RESPONSES TO SHORT-TERM FEED DEPRIVATION IN WEANLING PIGS. JOURNAL OF ANIMAL SCIENCE SUPPLEMENT. 2003. v. 81(Suppl.2):Abstract p. 63.Interpretive Summary:
                                Technical Abstract: Our objective was to determine endocrine responses to a short-term (24 h) feed deprivation period in weaned pigs.  Eight crossbred male pigs were weaned at 18 d of age and placed on a complex nursery diet.  At 4 d post-weaning, pigs were non-surgically fitted with an indwelling jugular vein catheter.  Pigs in the feed deprived group (FD; n=4) had feed removed 5 d post-weaning, and feed was returned 24 h later.  Control pigs (Con; n=4) were allowed ad libitum access to feed.  Blood samples were collected at 0 h, 6 h, 12 h, 24 h and 30 h for determination of ghrelin (GR) and IGF-I.  Four sub-samples were collected at each time point at 15 min intervals.  Body weights (BW) of pigs were determined at weaning, 21 d of age and after the 30 h time point (24 d of age).  There was a time X treatment difference in BW (P<0.05).  FD pigs gained less weight throughout the experiment than Con pigs (0.67 +/- 0.34 vs. 0.32 +/- 0.16 kg; P<0.06).  There was no difference in serum GR or IGF-I among the four sub-samples (P>0.90), therefore the means of the sub-samples were utilized for statistical analysis.  Serum GR at 0 h tended to be different between treatments (P=0.06), therefore GR concentrations of each pig at various time points were expressed relative to 0 h.  There was a time X treatment effect on GR concentrations (P<0.01).  Serum GR in FD pigs tended to decrease 12 h compared to Con pigs (P=0.08).  Relative concentrations of GR increased from 12 h to 24 h (P<0.01) and remained elevated through the 30-h time point in the FD treatment, but remained unchanged at all time points in Con pigs (P=0.91).   There was a time X treatment effect on IGF-I (P<0.001).  Serum IGF-I fell throughout the experiment and was lower in FD pigs at 12 h, 24 h and 30 h compared to Con pigs (P<0.05).  Serum IGF-I increased following the return of feed at 30 h compared to 24 h (P<0.06).  IGF-I concentrations rose throughout the study period in Con pigs (P<0.01).  These results indicate that serum GR and IGF-I are influenced by short-term feed deprivation in weanling pigs.


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