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Comparative Utilization of In-Seed Fats and the Respective Extracted Fats by the Young Pig

University of Illinois⁴, Urbana 61801

Abstract

Twelve weanling pigs (5.8 kg) were used to determine the relative utilization of in-seed (I) fats (fats in high-oil corn, roasted soybeans and sunflower seeds) and the respective extracted (E) fats (corn oil, soybean oil and sunflower seed oil). The average fat digestibility (corrected for endogenous fecal fat) for the I fats (74.9%) was less (P<.001) than for the E fats (90.2%). There were no significant differences in corrected fat digestibilities among the I fats, but there was a significant interaction (P<.001) between source and form of fat. The dry matter, energy and N in the I diets were also less digestible than in the E diets, with a source-by-form of fat interaction. Four hours after meals were offered, blood lipid values were lower (P<.01) in pigs fed I diets than in those fed E diets. The samples of ingesta from the gastrointestinal tract indicated that dietary particle separation from the roasted soybean and sunflower seed diets occurred in the stomach. There was an increase in the percentage of C18:0 in the proximal small intestine, an increase in C18:2 and a decrease in C16:0 and C18:0 in the distal part of the intestine, and an increase in C18:0 and C18:1 and a decrease in C16:0 and C18:2 in the large intestine. Although the I fats were less digestible than the E fats, high-oil corn, roasted soybeans and sunflower seeds were relatively efficient sources of supplemental fat and were easily incorporated into the diets for weanling pigs.

¹ Dept. of Anim. Sci., California Polytechnic Univ., Pomona.

² Dept. of Anim. Sci., Univ. of Illinois, Urbana.

³ This research was supported in part by a grant from the Moorman Manufacturing Co., Quincy, IL.

⁴ Dept. of Anim. Sci.