title: Interaction between fat type and lysolecithin supplementation in broiler feeds.
abstract: Lysolecithins are added to poultry diets to promote the intestinal absorption of nutrients, in particular of dietary fats. Lysolecithins contain a mixture of phospho- and lysophospholipids and differ in composition depending on the conditions and source of the lecithin used for its production. The importance of the lysolecithin composition and its interaction with the fat type was investigated in vitro in a fat digestion model and in vivo in a digestibility trial with broilers (24 to 28 d age). The in vitro digestion of soybean oil and pig lard was investigated without and with the inclusion of soybean or rapeseed lysolecithin. Correspondingly, for the digestibility trial, 108 Ross 308 male broilers were assigned to 6 dietary treatments: a basal diet with either soybean oil (5.3%) or pig lard (5.8%), each basal diet supplemented with 250 ppm soybean lysolecithin, and each basal diet supplemented with 250 ppm rapeseed lysolecithin. In vitro pig lard digestibility was significantly lower compared to soybean oil digestibility. Although in vivo no significant difference was observed for crude fat digestibility, broilers fed the basal diet with pig lard had a lower (P < 0.05) DM digestibility, nitrogen retention, and AMEn compared to those fed the basal diet with soybean oil. Lysolecithin supplementation showed a significant interaction with the fat type, both in vitro and in vivo. The in vitro hydrolysis of pig lard, but not of soybean oil, increased (P < 0.001) with supplementation of soybean and rapeseed lysolecithin. Moreover, soybean and rapeseed lysolecithin supplementation improved (P < 0.05) DM digestibility of the basal diet with pig lard by 5.1 and 5.7%, respectively; nitrogen retention by 2.8 and 3.1 g/kg, respectively; and AMEn by 182 and 199 kcal/kg, respectively. Despite the major difference in molecular composition, there was, however, no impact of the lysolecithin composition on in vitro and in vivo fat digestibility. This study demonstrates that the improvements that can be made with lysolecithin supplementation are highly dependent on the fat incorporated in broiler feeds.
authors.affiliation: Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium Kemin Europa N.V., Toekomstlaan 42, 2200 Herentals, Belgium matias.jansen@biw.kuleuven.be.
authors.forename: M
authors.initials: M
authors.lastname: Jansen
authors.affiliation: Kemin Europa N.V., Toekomstlaan 42, 2200 Herentals, Belgium.
authors.forename: F
authors.initials: F
authors.lastname: Nuyens
authors.affiliation: Laboratory of Livestock Physiology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium Leuven Food Science and Nutrition Research Center (LFoRCe).
authors.forename: J
authors.initials: J
authors.lastname: Buyse
authors.affiliation: ILVO (Institute for Agricultural and Fisheries Research), Animal Sciences Unit, Scheldeweg 68, 9090 Melle, Belgium.
authors.forename: S
authors.initials: S
authors.lastname: Leleu
authors.affiliation: Leuven Food Science and Nutrition Research Center (LFoRCe) Lab4Food, Cluster for Bioengineering Technology (CBeT), Department of Microbial and Molecular Systems (M2S), University of Leuven, Kleinhoefstraat 4, 2440 Geel, Belgium.
authors.forename: L
authors.initials: L
authors.lastname: Van Campenhout
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D029741:Brassica rapa / Q000737:chemistry; D002645:Chickens / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D004041:Dietary Fats / Q000378:metabolism*; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion / Q000502:physiology*; D007408:Intestinal Absorption / Q000502:physiology; D008244:Lysophosphatidylcholines / Q000008:administration & dosage / Q000378:metabolism*; D008297:Male; D011897:Random Allocation; D013024:Soybean Oil / Q000378:metabolism; D034421:Sus scrofa
chemical_list: D004041:Dietary Fats; D008244:Lysophosphatidylcholines; D013024:Soybean Oil; C029310:lard
keywords: broiler; digestion; fat; lysolecithin