title: Supplementation with organic or inorganic selenium in heat-distressed quail.
abstract: The present study was carried out to determine the effects of different sources of selenium (Se; sodium selenite [Na2SeO3] or selenomethionine [Se-Met]) supplementation on egg production, egg quality, levels of malondialdehyde (MDA), and Se in serum and egg yolk in heat-stressed Japanese quail (Coturnix coturnix japonica). The birds (n = 360; 55 days old) were randomly assigned to 12 treatment groups consisting of six replicates of five birds each in a 2 x 2 x 3 factorial arrangement of treatments (temperatures, selenium sources, selenium levels). Birds were kept in wire cages in a temperature-controlled room at either 22 (thermoneutral) or 34 degrees C (heat stress) for 8 h/day (09:00-17:00; till the end of study) and fed a basal (control) diet or the basal diet supplemented with either 0.15 or 0.30 mg of Na2SeO3 or selenomethionine/kg of diet. Heat exposure decreased live weight, feed intake, feed efficiency, egg production, and egg quality when basal diet was fed (P < 0.0001). A linear increase in feed intake (P = 0.001) and body weight (P = 0.001), egg production (P = 0.001), and improvement in feed efficiency (P = 0.001) and egg quality (P = 0.001) were found in Se-supplemented quail reared under heat stress conditions. Serum, egg white, and egg yolk Se (P < or = 0.001) concentrations increased linearly, whereas serum, liver, and egg yolk MDA concentrations decreased linearly (P = 0.001) as dietary Na2SeO3 or Se-Met supplementation increased. An interaction between dietary Se sources, temperature, and levels of supplementation (P < or = 0.05) for these parameters was detected. Supplementation with Se improved egg production, egg quality, and antioxidant status of birds, and the effects of Se-Met were relatively greater than Na2SeO3 in heat-stressed quail. Results of the present study suggest that supplementation with Se-Met can be considered to be more protective than Na2SeO3 by reducing the negative effects of oxidative stress induced by heat stress in quail.
authors.affiliation: Department of Animal Nutrition, Faculty of Veterinary Science, Firat University, 23119, Elazig, Turkey. nsahinkm@yahoo.com
authors.forename: Nurhan
authors.initials: N
authors.lastname: Sahin
authors.forename: Muhittin
authors.initials: M
authors.lastname: Onderci
authors.forename: Kazim
authors.initials: K
authors.lastname: Sahin
authors.forename: Omer
authors.initials: O
authors.lastname: Kucuk
mesh_terms: D000822:Animal Husbandry / Q000379:methods; D000824:Animal Nutritional Physiological Phenomena / Q000187:drug effects; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D001835:Body Weight / Q000187:drug effects; D003370:Coturnix / Q000502:physiology*; D019587:Dietary Supplements; D004435:Eating / Q000187:drug effects; D006358:Hot Temperature / Q000009:adverse effects; D010060:Ovulation / Q000187:drug effects; D010063:Ovum / Q000737:chemistry / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects*; D012645:Selenomethionine / Q000494:pharmacology*; D018038:Sodium Selenite / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D012645:Selenomethionine; D018038:Sodium Selenite