title: Effect of dietary lactulose supplementation on growth performance, nutrient digestibility, meat quality, relative organ weight, and excreta microflora in broilers.
abstract: A 35 d trial was conducted to evaluate the effects of dietary lactulose on growth performance, nutrient digestibility, meat quality, relative organ weight, and excreta microflora in broilers. A total of 816 1-day-old male Ross broilers (40.2 ± 0.4 g) were allotted to 4 dietary treatments using 12 cages with 17 chicks per cage. Treatments were: 1) CON, basal diet; 2) L05, CON + 0.05% lactulose; 3) L10, CON + 0.10% lactulose; and 4) L15, CON + 0.15% lactulose. Higher (P < 0.05) body weight gain (BWG) and lower (P < 0.05) feed conversion ratio (FCR) were observed in broilers fed the L15 diet compared with those fed the CON diet during d 22 to 35. During d 0 to 35, BWG was higher (P < 0.05) and FCR was lower (P < 0.05) in broilers fed lactulose diets than those fed the CON diet. Additionally, broilers fed L15 diets had the highest BWG (P < 0.05) and lowest FCR (P < 0.05). The apparent total tract digestibility (ATTD) of DM and nitrogen (N) was increased (P < 0.05) in broilers fed the L15 diet compared with those fed the CON diet. Drip loss was decreased (P < 0.05) in L10 and L15 treatments compared with CON treatment on d 1, d 3, and d 5. On d 3, lowest (P < 0.05) drip loss was observed in the L15 treatment. Excreta E. coli counts in the L15 treatment were decreased (P < 0.05) on d 14, but Lactobacillus counts in the L15 treatment were increased (P < 0.05) on d 14 and d 35 compared with the CON diet. A linear effect (P < 0.05) was observed on BWG (d 22 to 35), FCR (d 0 to 35), the ATTD of DM and N, drip loss, E. coli (d 14), and Lactobacillus (d 14 and d 35) counts. In conclusion, dietary supplementation of 0.15% lactulose can improve growth performance and nutrient digestibility; as well as increase the proliferation of Lactobacillus and decrease E. coli counts in excreta.
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Chungnam 31116, South Korea.
authors.forename: P Y
authors.initials: PY
authors.lastname: Zhao
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Chungnam 31116, South Korea.
authors.forename: H L
authors.initials: HL
authors.lastname: Li
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Chungnam 31116, South Korea.
authors.forename: M
authors.initials: M
authors.lastname: Mohammadi
authors.affiliation: Department of Animal Resource & Science, Dankook University, Cheonan, Chungnam 31116, South Korea inhokim@dankook.ac.kr.
authors.forename: I H
authors.initials: IH
authors.lastname: Kim
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion; D005243:Feces / Q000382:microbiology; D007792:Lactulose / Q000008:administration & dosage / Q000378:metabolism*; D008297:Male; D008460:Meat / Q000032:analysis*; D064307:Microbiota; D009929:Organ Size
chemical_list: D007792:Lactulose
keywords: broiler; excreta microflora; growth performance; lactulose; nutrient digestibility