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During lactation, sows are fed ad libitum to optimize lactation volume and maintain body condition. However, ad libitum feeding for high-yielding sows still does not meet the high nutrient requirements. In this context, lysophospholipids can be potentially used as emulsifiers to enhance the utilization of dietary fat, and may help improve nutrient digestibility and production performance of sows. The purpose of the present study was to investigate the effects of dietary lysophospholipid complex (LPL) on lactation performance, production of immunoglobulins and nutrient digestibility in lactating sows. A total of 40 sows (Large White × Landrace), similar in terms of body weight (222 ± 13 kg) and parity (2.5 ± 0.6) were allotted to 5 dietary treatments. From d107 of gestation to d21 of lactation, sows were fed corn-soybean meal-based diets containing 0, 250, 500, 750 and 1000 mg/kg LPL, respectively.
As the dietary concentration of LPL increased, body weight loss of sows during lactation was reduced, whereas average daily gain of nursing piglets was increased. Likewise, higher doses of LPL increased linearly the levels of IgA, IgM and IgG in colostrum and milk. The apparent total tract digestibility of dry matter, crude protein, ether extract, gross energy, neutral detergent fiber and acid detergent fiber in sows also increased as the concentration of LPL augmented. The content of IgA in the sows’ serum increased quadratically, as well as the contents of IgA and IgM in piglets’ serum, which also increased quadratically as the concentration of LPL incremented. The content of serum glucose was raised linearly, whereas the contents of serum triglyceride and total cholesterol were decreased linearly in sows as the concentration of LPL increased.
In conclusion, an increasing supplementation of LPL improved performance, colostrum and milk immunoglobulins, serum parameters, nutrient digestibility and litter performance in lactating sows. The dietary dose of 750mg/kg LPL supplementation was found optimal for lactating sows based on minimizing back fat loss and maximizing piglet weight gain.
Wang, Q. Q., Long, S. F., Hu, J. X., Li, M., Pan, L., Piao, X. S. (2019). Effects of dietary lysophospholipid complex supplementation on lactation performance, and nutrient digestibility in lactating sows. Animal Feed Science and Technology (2019). https://doi.org/10.1016/j.anifeedsci.2018.12.009