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Two growth experiments and one digestibility experiment were conducted to study the effect of trimethylamine oxide (TMAO) and betaine in swine diets. In Exp. 1, 36 limit-fed pigs averaging 19.1 kg in initial weight were used to study the effect of adding TMAO at 10 g/kg of feed or betaine at an equivalent level of methyl groups (10.5 g/kg feed) to a high-fat (11.3% ether extract) basal diet. Dietary addition of TMAO increased ADG by 61 g/d, reduced number of days to market by 8.3 d (P<.02), and tended (P<.09) to improve gain/feed (G/F) compared with the control diet. Betaine had no effect on growth performance of pigs. Adding TMAO or betaine to diets had no effect on percent carcass fat, percent carcass lean, or dressing percentage. Dietary supplementation of TMAO reduced (P<.05) plasma triacylglycerol level (TAG) compared with the control diet. There was no effect of dietary TMAO or betaine on sensory quality characteristics of pork. In Exp. 2, 48 ad libitum-fed pigs averaging 21.7 kg initial BW and 104.7 kg final BW were used to determine the effect of adding low and intermediate levels of TMAO (1, 2, or 5 g/kg) to diets. Adding 1 g of TMAO increased G/F (P<.01) compared with control pigs. When using orthogonal contrasts, adding 2 g of TMAO reduced (P<.05) P2 backfat thickness and tended to increase (P<.09) lean percentage compared with the control diet. Trimethylamine oxide gave a quadratic effect (P<.05) on plasma TAG levels. Adding 1 and 2 g of TMAO increased plasma TAG, but 5 g of TMAO decreased it compared with the control diet. In Exp. 3, 12 barrows of 42.3 kg average initial BW and 50.0 kg final BW were used to investigate the effect of supplementing diets with 1 g of TMAO and 1.27 g of betaine/kg of feed on apparent total tract nutrient digestibility. The addition of TMAO increased (P<0.03) apparent total tract digestibility of fat (HCl-EE). Betaine had no such effect. Adding TMAO to diets influenced growth performance and carcass quality in a dose-dependent manner.

Four barrows of approximately 40 kg initial body weight, fitted with post-valvular T-cecum cannulas, were used to study the effect of lecithin as an external emulsifier on apparent ileal and overall digestibility of crude fat, fatty acids, and other dietary nutrients (DM, N, GE, crude fiber [CF], P, Ca, and Mg), as well as the utilization of N, GE, Ca, P, and Mg. Two levels of lecithin (0 and .24%) and two levels of rendered fat (0 and 6%) in cereal-soybean meal-based diets were investigated according to a 4 x 4 Latin square design. No significant interactions were found between lecithin and rendered fat for apparent digestibility of crude fat as estimated at the end of the small intestine and the total digestive tract. Lecithin decreased the apparent ileal digestibility of C16:0 fatty acid (P < .1) and the apparent overall digestibility of C14:0 fatty acid (P < .05) and C18:2 fatty acid (P < .1). The apparent ileal and overall digestibility of crude fat (P < .001) and total fatty acids (P < .05) increased with the inclusion of rendered fat in diets. Furthermore, rendered fat increased the apparent ileal and overall digestibility of C14:0 (P < .01), C16:1 (ileal, P < .001; overall, P < .1), and C18:1 (P < .05) fatty acids and the apparent overall digestibility of C18:0 (P < .001) fatty acid. Lecithin had no impact on the apparent digestibility and retention (percentage of intake) of GE, N, total P, Ca, and Mg.(ABSTRACT TRUNCATED AT 250 WORDS)

Lecithin was investigated in diets for growing-finishing pigs. Diets were based on corn and soybean meal and contained a constant ME:lysine level. The use of lecithin as an emulsifier on utilization of soy oil by the pig was investigated in Exp. 1. Diets were arranged in a 2 x 2 factorial structure with two levels of lecithin (0 and 2%) and two levels of soy oil (0 and 6%). There were no interactions between lecithin and soy oil for any measurements of growth performance. In general, the inclusion of lecithin or soy oil did not affect (P > .1) ADG but did improve (P < .01) gain/feed during the finishing period and during the entire experiment. During the finishing period, gain/ME intake was improved (P < .01) by both lecithin and soy oil. The use of lecithin as an energy source for pigs was investigated in Exp. 2. Dietary treatments were corn and soybean meal diets with 0, 1, 2, or 3% lecithin. There were no significant differences in performance of pigs as measured by ADG, ADFI, gain/feed, and gain/ME intake among the four lecithin levels. Lecithin did not improve utilization of soy oil by growing-finishing pigs. Furthermore, lecithin was not an efficacious source of supplemental dietary fat for growing-finishing pigs in this study.

One digestibility experiment (Exp. 1) and two growth experiments (Exp. 2 and 3) were conducted to evaluate the use of lecithin as an emulsifier of soy oil and(or) an energy source in a two-phase starter diet program. Phase 1 consisted of d 0 to 14 postweaning, and Phase 2 consisted of d 14 to 35 postweaning. Diets were based on corn, soybean meal, and 20% dried whey and contained a constant ME:lysine level. In Exp. 1 and 2, two levels of lecithin (0 and 2%) at two levels of soy oil (0 and 6%) were investigated. In both experiments, there was no interaction between lecithin and soy oil for any traits measured. In Exp. 1, the apparent digestibility of fat increased significantly with increased fat level in the diets. Addition of lecithin to diets improved (P < .05) nitrogen retention, and the addition of soy oil significantly improved apparent digestibility of DM, GE, fat, and CP. In Exp. 2, there was no significant effect of lecithin or soy oil on ADG. In Phase 2 and overall, the inclusion of lecithin and soy oil to diets significantly increased gain/feed but did not significantly improve gain/ME intake. In Exp. 3, pigs were fed diets containing 0, 1, 2, or 3% lecithin. The addition of lecithin to diets did not affect ADG, ADFI, gain/feed, or gain/ME intake during Phases 1, 2, or overall. These results fail to demonstrate that the addition of lecithin to diets for young pigs improves utilization of soy oil or growth performance.