title: Effects of dietary gossypol concentration on growth performance, blood profiles, and hepatic histopathology in meat ducks.
abstract: The objective of this study was to determine the effects of gossypol from cottonseed meal (CSM) on growth performance, blood biochemical profiles, and liver histopathology of ducks. A total of 900 1-d-old ducks were randomly allocated to 5 treatments with 12 pens/treatment and 15 ducks/pen. The 5 experimental diets were formulated in such a way that 0% (a corn-soybean meal basal diet, diet 1), 25% (diet 2), 50% (diet 3), 75% (diet 4), and 100% (diet 5) of protein from soybean meal were replaced with that from CSM. All diets were formulated on a digestible amino acid basis. The experiment included 2 phases, the starter phase (1 to 3 wk) where the test diets contained graded levels of CSM and the growth phase (4 to 5 wk) where birds were fed a corn-soybean basal diet to examine the recovery of ducks after CSM withdrawal. Dietary CSM and gossypol linearly (P < 0.01) and quadratically (P < 0.01) decreased ADG and ADFI during d 1 to 14. The threshold of daily total gossypol (TG) and free gossypol (FG) intake based on ADG on d 1 to 7 and d 7 to 14 were 32.20 and 2.64 mg/d, and 92.12 and 9.62 mg/d, respectively. Serum alanine aminotransferase increased (P < 0.05) linearly with increasing level of gossypol in the diets (d 7), whereas aspartate aminotransferase increased (P < 0.05) linearly and quadratically (d 14). Serum albumin concentration decreased (P < 0.05) quadratically with increasing dietary CSM concentrations on d 21. The degree of damage to the liver increased markedly with increasing dietary CSM and gossypol content and the length of CSM and gossypol intake. On d 35, there was no difference on BW and blood profiles of ducks among all treatments. These results suggest that meat ducks' dietary TG and FG concentration should be lower than 928.9 and 77.2 mg/kg, respectively, during d 1 to 21 of age and that a 2-wk withdrawal of diets containing gossypol should be considered.
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: Q F
authors.initials: QF
authors.lastname: Zeng
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: G L
authors.initials: GL
authors.lastname: Yang
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: G N
authors.initials: GN
authors.lastname: Liu
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: J P
authors.initials: JP
authors.lastname: Wang
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: S P
authors.initials: SP
authors.lastname: Bai
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: X M
authors.initials: XM
authors.lastname: Ding
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130.
authors.forename: Y H
authors.initials: YH
authors.lastname: Luo
authors.affiliation: Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China, 611130 zkeying@sicau.edu.cn.
authors.forename: K Y
authors.initials: KY
authors.lastname: Zhang
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D001774:Blood Chemical Analysis / Q000662:veterinary; D003369:Cottonseed Oil / Q000633:toxicity; D004032:Diet / Q000662:veterinary*; D004372:Ducks / Q000097:blood / Q000254:growth & development / Q000502:physiology*; D005260:Female; D006072:Gossypol / Q000633:toxicity*; D008099:Liver / Q000187:drug effects* / Q000473:pathology; D008297:Male; D014118:Toxins, Biological / Q000633:toxicity
chemical_list: D003369:Cottonseed Oil; D014118:Toxins, Biological; D006072:Gossypol
keywords: duck; gossypol; growth performance; hepatic histopathology; serum biochemical profile