title: Tomato powder in laying hen diets: effects on concentrations of yolk carotenoids and lipid peroxidation.
abstract: 1. The effects of tomato powder supplementation on performance, egg quality, serum and egg yolk carotenoids, vitamins and malondialdehyde (MDA) concentrations in were investigated in laying hens in mid-lay. 2. A total of 90 laying hens, 49 weeks old, were divided into 3 groups consisting of 6 replicate cages, 5 birds per cage. Birds were randomly fed on one of three diets: basal diet and basal diet added with 5 or 10 g tomato powder per kg diet. 3. As tomato powder concentration increased, there were linear increases in feed intake, egg production, egg weight and yolk colour and a linear decrease in feed conversion. Shell weight, shell thickness and Haugh unit remained unchanged in response to dietary treatments. 4. Concentrations of serum and egg yolk lycopene, β-carotene, lutein and vitamin A increased for both diets including tomato powder, whereas MDA decreased linearly with increasing supplemental tomato powder concentration. 5. Tomato powder supplementation increased egg production persistency and increased carotenoids and vitamin A contents in egg yolk, accompanied by reduced yolk lipid peroxidation.
authors.affiliation: Department of Animal Nutrition, Faculty of Veterinary Medicine, Dicle University, 21280 Diyarbakir, Turkey.
authors.forename: F
authors.initials: F
authors.lastname: Akdemir
authors.forename: C
authors.initials: C
authors.lastname: Orhan
authors.forename: N
authors.initials: N
authors.lastname: Sahin
authors.forename: K
authors.initials: K
authors.lastname: Sahin
authors.forename: A
authors.initials: A
authors.lastname: Hayirli
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002338:Carotenoids / Q000378:metabolism; D002645:Chickens / Q000502:physiology*; D002851:Chromatography, High Pressure Liquid; D019587:Dietary Supplements / Q000032:analysis*; D004305:Dose-Response Relationship, Drug; D004530:Egg Yolk / Q000737:chemistry; D004531:Eggs / Q000592:standards*; D005260:Female; D015227:Lipid Peroxidation; D018551:Solanum lycopersicum / Q000737:chemistry*; D052287:Oviparity; D010063:Ovum / Q000502:physiology; D028321:Plant Preparations / Q000008:administration & dosage*; D011897:Random Allocation
chemical_list: D028321:Plant Preparations; D002338:Carotenoids