Bone characteristics, pre-caecal phytate degradation, mineral digestibility and tissue expression were marginally affected by zinc level and source in phytase-supplemented diets in 21-day-old broiler chickens.

IF 1.6 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE British Poultry Science Pub Date : 2024-06-01 Epub Date: 2024-02-23 DOI:10.1080/00071668.2024.2311290
H Philippi, V Sommerfeld, A Monteiro, M Rodehutscord, O A Olukosi
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Abstract

1. This study determined the effect of dietary Zn concentration and source in phytase-supplemented diets on bone mineralisation, gastrointestinal phytate breakdown, mRNA-level gene expression (in jejunum, liver and Pectoralis major muscle) and growth performance in broiler chickens.2. Male Cobb 500 broilers were housed in floor pens (d 0-d 21) to test seven treatments with six replicate pens (12 birds per pen). Diets were arranged in a 2 × 3 + 1-factorial arrangement. The experimental factors were Zn source (Zn-oxide (ZnO) or Zn-glycinate (ZnGly) and Zn supplementation level (10, 30 or 50 mg/kg of diet). A maize-soybean meal-based diet without supplementation and formulated to contain 28 mg Zn/kg (analysed to be 35 mg Zn/kg), served as a control.3. Zinc source and level did not influence (p > 0.05) bone ash concentration and quantity or mineral concentrations in bone ash. Tibia thickness was greater in the treatment ZnO10 than in the treatments ZnO30 and ZnGly50 (Zn level × Zn source: p = 0.036), but width and breaking strength were not affected.4. Pre-caecal P digestibility and concentrations of phytate breakdown products in the ileum, except for InsP5, were not affected by Zn source or level. Only the expression of EIF4EBP1 (eukaryotic translation initiation factor 4E-binding protein 1) and FBXO32 (F-box only protein 32) in Pectoralis major muscle was affected by source, where expression was increased in ZnO compared to ZnGly diets (p < 0.05).5. In conclusion, Zn level and source did not affect gastrointestinal phytate degradation and bone mineralisation in phytase-supplemented diets. The intrinsic Zn concentration appeared to be sufficient for maximum bone Zn deposition under the conditions of the present study but requires validation in longer-term trials.

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21 日龄肉鸡的骨骼特征、盲肠前植酸降解、矿物质消化率和组织表达受植酸酶补充日粮中锌水平和来源的影响较小。
1.本研究确定了补充植酸酶的日粮中锌的浓度和来源对肉鸡骨骼矿化、胃肠道植酸分解、mRNA 水平基因表达(空肠、肝脏和胸大肌)和生长性能的影响。 雄性 Cobb 500 肉鸡饲养在落地式鸡笼中(0-21 日龄),以六个重复鸡笼(每个鸡笼 12 只鸡)对七个处理进行试验。日粮采用 2 × 3 + 1 的因子排列。试验因子为锌来源(氧化锌(ZnO)或甘氨酸锌(ZnGly))和锌补充水平(10、30 或 50 mg/kg 日粮)。3. 锌的来源和水平不影响骨灰浓度和数量或骨灰中的矿物质浓度(p > 0.05)。ZnO10 处理的胫骨厚度大于 ZnO30 和 ZnGly50 处理的胫骨厚度(锌水平 × 锌来源:p = 0.036),但宽度和断裂强度不受影响。 4.除 InsP5 外,盲肠前 P 消化率和回肠中植酸分解产物的浓度不受锌来源或锌水平的影响。只有 EIF4EBP1(真核翻译起始因子 4E 结合蛋白 1)和 FBXO32(仅 F-box 蛋白 32)在胸大肌中的表达受到来源的影响,与 ZnGly 日粮相比,ZnO 日粮中的表达增加了(p
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来源期刊
British Poultry Science
British Poultry Science 农林科学-奶制品与动物科学
CiteScore
3.90
自引率
5.00%
发文量
88
审稿时长
4.5 months
期刊介绍: From its first volume in 1960, British Poultry Science has been a leading international journal for poultry scientists and advisers to the poultry industry throughout the world. Over 60% of the independently refereed papers published originate outside the UK. Most typically they report the results of biological studies with an experimental approach which either make an original contribution to fundamental science or are of obvious application to the industry. Subjects which are covered include: anatomy, embryology, biochemistry, biophysics, physiology, reproduction and genetics, behaviour, microbiology, endocrinology, nutrition, environmental science, food science, feeding stuffs and feeding, management and housing welfare, breeding, hatching, poultry meat and egg yields and quality.Papers that adopt a modelling approach or describe the scientific background to new equipment or apparatus directly relevant to the industry are also published. The journal also features rapid publication of Short Communications. Summaries of papers presented at the Spring Meeting of the UK Branch of the WPSA are published in British Poultry Abstracts .
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