title: Effects of dietary cholesterol supplementation on growth and cholesterol metabolism of rainbow trout (Oncorhynchus mykiss) fed diets with cottonseed meal or rapeseed meal.
abstract: This study was conducted to evaluate the effects of cholesterol on growth and cholesterol metabolism of rainbow trout (Oncorhynchus mykiss) fed diets with cottonseed meal (CSM) or rapeseed meal (RSM). Four experimental diets were formulated to contain 550 g kg(-1) CSM or 450 g kg(-1) RSM with or without 9 g kg(-1) supplemental cholesterol. Growth rate and feed utilization efficiency of fish fed diets with 450 g kg(-1) RSM were inferior to fish fed diets with 550 g kg(-1) CSM regardless of cholesterol level. Dietary cholesterol supplementation increased the growth rate of fish fed diets with RSM, and growth rate and feed utilization efficiency of fish fed diets with CSM. Similarly, dietary cholesterol supplementation increased the plasma total cholesterol (TC), high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triiodothyronine levels, but decreased the plasma triglycerides and cortisol levels of fish fed diets with RSM or CSM. In addition, supplemental cholesterol increased the free cholesterol and TC levels in intestinal contents, but decreased the hepatic 3-hydroxy-3-methyl-glutaryl-CoA reductase activity of fish fed diets with RSM or CSM. These results indicate that 9 g kg(-1) cholesterol supplementation seems to improve the growth of rainbow trout fed diets with CSM or RSM, and the growth-promoting action may be related to the alleviation of the negative effects caused by antinutritional factors and/or make up for the deficiency of endogenous cholesterol in rainbow trout.
authors.affiliation: Key Laboratory of Animal Nutrition and Feed Science of Yunnan Province, Yunnan Agricultural University, Kunming, 650201, China.
authors.forename: Junming
authors.initials: J
authors.lastname: Deng
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Long
authors.forename: Linli
authors.initials: L
authors.lastname: Tao
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Guoyi
authors.initials: G
authors.lastname: Niu
authors.forename: Bin
authors.initials: B
authors.lastname: Kang
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D029741:Brassica rapa / Q000737:chemistry*; D002118:Calcium / Q000097:blood; D002784:Cholesterol / Q000097:blood / Q000378:metabolism / Q000494:pharmacology; D002790:Cholesterol 7-alpha-Hydroxylase / Q000235:genetics / Q000378:metabolism; D002791:Cholesterol, Dietary / Q000378:metabolism; D003369:Cottonseed Oil / Q000737:chemistry*; D004032:Diet / Q000662:veterinary*; D006854:Hydrocortisone / Q000097:blood; D007413:Intestinal Mucosa / Q000378:metabolism; D008099:Liver / Q000201:enzymology / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism; D017686:Oncorhynchus mykiss / Q000097:blood / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood
chemical_list: D002791:Cholesterol, Dietary; D003369:Cottonseed Oil; D014284:Triiodothyronine; D010758:Phosphorus; D002784:Cholesterol; D002790:Cholesterol 7-alpha-Hydroxylase; D013974:Thyroxine; D002118:Calcium; D006854:Hydrocortisone