Effects of Post-Weaning Nutritional Conditions on Isowean Pigs

This study quantifies the responses of isowean pigs to post-weaning nutritional conditions as may beencountered during extended shipment. PIC breeding stock pigs at 8 to 12 days of age (3.5 to 4.0 kg body weight) weresubjected to four nutritional regimens for 72 h. The pigs were then raised with ad libitum feeding for 14 days.Thermoneutral environments were used throughout the experiment. Pigs deprived of feed and water (i.e., Fast) had higherbody weight loss (of 0.61 kg/pig or 17% of their initial body weight) as compared with pigs provided with feed and watersupplement (0.39 kg/pig or 11% of their initial body weight) or water supplement only (0.43 kg/pig or 11.5% IBW) (P <0.05). All the treatments led to significant rise in blood urea nitrogen but fall in blood glucose (P < 0.05). However, theglucose levels were much higher than the generally considered hypoglycemic level (75 mg/dL). All pigs showed a similardegree of dehydration, as evidenced by elevated hematocrit and blood electrolyte concentrations (P < 0.05). Thephysiological responses returned to normal during the 14-day growth period and were similar for all the pigs. The resultssuggest that isowean pigs (PIC genetic line) responded well to post-weaning nutritional conditions typically encounteredduring extended shipments. Supply of bacteria-resistant water supplement such as Aqua-Jel seemed beneficial in reducingstress and may be considered for extended commercial shipment. However, in-transit supply of feed added little benefit tothe pigs and thus may be omitted. This omission has special implications for international shipments because certaincountries prohibit inclusion of feed in shipment. The energetics data of this study may be used to design and operateventilation systems in transportation and production facilities for the isowean pigs.