title: Effect of expanded cottonseed meal on laying performance, egg quality, concentrations of free gossypol in tissue, serum and egg of laying hens.
abstract: Three hundred and sixty Hy-Line Brown hens, 40 week of age, were allocated to five treatments, each of which included four replicates of 18 hens. After an expanded process of cottonseed meal (CSM), free gossypol content in CSM was decreased from 1.24 to 0.40 g/kg. The dietary treatments were corn-soybean meal based diets including 6% CSM and 6%, 8% and 10% expanded cottonseed meal (ECSM). Hens fed 8% ECSM had higher (P<0.05) laying rate and average egg weight than those fed 6% CSM. The albumen height and Haugh unit in the control group, 6% and 8% ECSM groups were superior (P<0.05) to other treatments. Hens fed 6% CSM resulted in severe (P<0.05) egg yolk discoloration. Free gossypol (FG) concentrations in yolk and albumen and tissues of the 6% CSM group were greater (P<0.05) than those in any ECSM treatments. Hens fed 6% CSM and 10% ECSM had the highest (P<0.05) FG concentrations in the liver compared with those in the kidney and muscle, and higher (P<0.05) FG residues in yolk than those in albumen. In conclusion, FG in CSM can be reduced by 68% through an expanded process and ECSM can be available in laying hens at up to 10% of the total diet and an appropriate replacement of soybean meal with ECSM may improve performance in laying hens.
authors.affiliation: Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Yuan
authors.forename: Hua-Hui
authors.initials: HH
authors.lastname: Song
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Zhang
authors.forename: Yuan-Jing
authors.initials: YJ
authors.lastname: Jiang
authors.forename: Ai-Ting
authors.initials: AT
authors.lastname: Zhang
authors.forename: Mahmoud Mostafa
authors.initials: MM
authors.lastname: Azzam
authors.forename: Xiao-Ting
authors.initials: XT
authors.lastname: Zou
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002645:Chickens / Q000378:metabolism / Q000502:physiology*; D003369:Cottonseed Oil; D004531:Eggs / Q000032:analysis; D005260:Female; D006072:Gossypol / Q000032:analysis* / Q000097:blood; D013024:Soybean Oil / Q000378:metabolism
chemical_list: D003369:Cottonseed Oil; D013024:Soybean Oil; D006072:Gossypol
keywords: egg quality; expanded cottonseed meal; gossypol; laying hens; laying performance