关键词: 肉鸡, 硒代葡萄糖, 生长性能, 肉品质, 血清免疫指标, 血清抗氧化指标

Abstract: [Objective] To investigate the effects of dietary supplementation with selenoglucose on growth performance, meat quality, serum immune indices, and serum antioxidant indices in broilers. [Methods] A single-factor completely randomized design was employed, with 288 one-day-old, weight-matched, healthy, male Cobb 505 white-feather broilers randomly assigned to four groups （A-D）, each comprising six replicates of 12 birds. Group A was fed a corn-soybean basal diet; groups B, C, and D received the basal diet supplemented with 0.15 mg/kg, 0.30 mg/kg, and 0.60 mg/kg selenoglucose, respectively. The trial lasted 42 days and was divided into two phases based on composition and nutritional levels of the basal diet: early stage （1-21 days） and late stage （22-42 days）. At the end of 21 and 42 days, growth performance was measured, and blood samples were collected from broilers in each group to determine serum immune and antioxidant indices. At day 42, breast muscle samples were collected for meat quality analysis. [Results] Regarding growth performance, from 1-21 days, the average daily gain （ADG） in groups B, C, and D was significantly （P<0.05） higher than that in group A; from 22-42 days, the ADG in group D was significantly （P<0.05） higher than that in groups A, B, and C, and the feed-to-gain ratio （F:G） in group A was significantly （P<0.05） higher than that in groups C and D; from 1-42 days, the ADG in group D was significantly （P<0.05） higher than that in groups A, B, and C, and the F:G in group A was significantly （P<0.05） higher than that in groups B, C, and D. In terms of meat quality, the drip loss in groups A and B was significantly higher （P<0.05） than in groups C and D; the shear force in groups A, C, and D was significantly higher （P<0.05） than in group B; the water-holding capacity in group A was significantly higher （P<0.05） than in groups B, C, and D; the cooking yield in group B was significantly higher （P<0.05） than in groups A, C, and D. Regarding serum immune indices, from 1-21 days, serum immunoglobulin A （IgA） levels in groups C and D was significantly （P<0.05） higher than in groups A and B; serum immunoglobulin G （IgG） and immunoglobulin M （IgM） levels in group C was significantly （P<0.05） higher than in groups A, B, and D; from 22-42 days, serum IgA levels in groups C and D was significantly （P<0.05） higher than in groups A and B; serum IgG levels in group C was significantly （P<0.05） higher than in groups A, B, and D; serum IgG and IgA levels in group A was significantly （P<0.05） lower than in groups B and D; serum IgM levels in groups A, C, and D was significantly （P<0.05） higher than in group B. For serum antioxidant indices, from 1-21 days, serum glutathione peroxidase （GSH-Px）, glutathione (GSH), and total antioxidant capacity （T-AOC） levels in groups C and D were significantly （P<0.05） higher than in groups A and B; serum GSH and T-AOC levels in group D were significantly （P<0.05） higher than in group C; from 22-42 days, serum GSH-Px levels in groups B, C, and D was significantly （P<0.05） higher than in group A; serum malondialdehyde （MDA） levels in groups B, C, and D was significantly （P<0.05） lower than in group A; serum superoxide dismutase （SOD） and GSH levels in group D were significantly （P<0.05） higher than in groups A, B, and C; serum T-AOC levels in groups B and C was significantly （P<0.05） higher than in group A. [Conclusion] The optimal dietary selenoglucose supplementation for broilers was determined to be 0.6 mg/kg. Under this condition, broilers exhibited the best comprehensive performance in terms of growth （ADG, F:G）, meat quality （drip loss）, immune function （IgA, IgG）, and antioxidant capacity （GSH-Px, GSH, SOD, T-AOC）.

Key words: broiler, selenoglucose, growth performance, meat quality, serum immune indices, serum antioxidant indices