1019 Effect of lysophospholipids supplementation in different energy diets on growth performance, nutrient digestibility, milk composition, litter performance, and fecal score in lactating sows

Emulsifiers are substances that stabilize mixtures and prevent oil and water from separating, which is good for the digestion of lipids. This study was conducted to evaluate the effect of dietary emulsifier (lysophospholipids, LPL) supplementation with different energy diets in lactating sows. A total of 32 multiparous sows (Landrace × Yorkshire) were used in a 21-d experiment. On d 110 of gestation, sows were weighed and moved into the farrowing facility, randomly assigned in a 2 × 2 factorial arrangement with two levels of Lipidol (0 and 0.1%; Lipidol contains 3% LPL) and two level of metabolizable energy (3265 and 3165 kcal/kg) according to their BW. Individual sows were weighed and scanned for backfat thickness to determine weight and backfat loss. Chromium oxide (0.2%) was added to the diet as an indigestible marker to determine ATTD of DM, N, and GE. Milk crude fat (Method 960.39; AOAC, 2007) was measured according to the Association of Official Analytical Chemists. Lactose was assayed using an enzymatic method. Data were analyzed as a randomized complete block design with a 2 × 2 factorial arrangement using the GLM Procedure of SAS (SAS Inst. Inc., Cary, NC). A probability level of P< 0.05 was considered to be significant. Body weight loss (18.6 vs. 15.1 kg) and backfat thickness loss (2.4 vs. 1.9 mm) were decreased (P< 0.05) by LPL supplementation. Backfat thickness (17.0 vs. 14.5 mm) at weaning was higher (P< 0.05) in sows fed LPL supplementation diets. The ATTD of DM (84.4 vs. 83.2%), N (83.6 vs. 82.5%), GE (82.9 vs. 82.1%), and crude fat (80.1 vs. 79.2%) in sows fed LPL diets was increased (P< 0.05) compared with those fed non-LPL diets. Sows fed the high energy diets had higher (P< 0.05) milk fat (11.3 vs. 10.0%) on d 10 and milk lactose (4.6 vs. 3.9%) on d 20 than those fed the low energy diets. Milk fat (11.3 vs. 9.9%) and lactose concentrations (4.6 vs. 4.0%) in LPL supplementation treatments were increased (P< 0.05) compared with non-LPL treatments on d 10 and d 20, respectively. Interactive effects (P< 0.05) between energy and LPL were observed on milk fat concentration on d 10. In conclusion, LPL addition decreased body weight loss and backfat thickness loss and improved nutrient digestibility and milk fat as well as milk lactose concentrations. Additionally, LPL and energy can interactively increase milk fat concentration in lactating sows.