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University of Nebraska, Lincoln 68583
4 Person to whom reprint requests should be directed.
Abstract
Two experiment were conducted to determine the effects of supplementary dietary energy (carbohydrate versus fat) fed to sows during late gestation on energy storage and glucose homeostasis in neonatal pigs. In the first experiments, 28 crossbred sows received one of two dietary treatments that were initiated on day 100 of gestation. The control group was fed daily 1.82 kg of corn-soybean meal-based diet plus and additional .18 kg of cornstarch. Their counterparts were fed 1.82 kg of corn-soybean meal diet containing 8% bleachable fancy tallow. The effect of maternal dietary energy source during late gestation on glucose homeostasis was evaluated by fasting pigs from birth (t0), whereas the gestation-lactation effect was evaluated by fasting pigs after they had nursed the sow for 24 hr (t24). Pigs on the tallow treatment responded differently to the t0 fast, as determined by the patterns of plasma glucose (treament x time, P<.05) and free fatty acids (treatment x time, P<.10) The tallow group maintained a slightly higher glucose concentration during the initial 24 hr, after which no difference was observed. Control pigs reached a peak free fatty acid (FFA) concentration by 12 hr, whereas the tallow group reached a maximum by 24 hr, which corresponded with declining glucose concentration. Pigs on teh t24 tallow treatment maintained a slightly higher plasma glucose concentration during the initial 24 hr of fasting (12 hr – 68.3 vs 63.2 mg/100 ml; 24 hr – 67.1 vs 56.3 mg/100 ml); however, no significant treatment effect or treatment x time interaction was observed. Pigs on the tallow treatment maintained a higher, although not significantly different, plasma FFA concentration during the fast (144 µeq/liter) than pigs in the control group (126 µeq/liter). in the second experiment, progeny of 12 sows were sacrificed immediately after birth. the respective carcass lipid (percentage) and liver glycogen (millilipid (percentage) and liver glycogen (milligrams/gram) concentrations for pigs from sows fed the control and tallow diets were 1.48, 229.1 vs 1.50, 234.9. The liver glycogen to body weight ratio (milligrams:gram) was 7.1 and 7.8 for the control and tallow groups, respectively.
1 Published as Paper No. 6052, Journal Ser., Nebraska Agr. Exp. Sta.
2 Dept. of Anim. Sci. The authors wish to express appreciation to the Fats and Proteins Research Foundation, Des Plaines, IL, for partial financial support of this project
3 Present address: Dept. of Anim. Sci., Cornell Univ., Ithaca, NY.
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