Effects of dietary calcium and microbial phytase on the bioavailability of two sources of zinc in broilers.

IF 1.6 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE British Poultry Science Pub Date : 2024-09-25 DOI:10.1080/00071668.2024.2383920

V Khaksar, F Hervo, N Même, A R Monteiro, A Narcy

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Abstract

1. The objective of this study was to test the effect of microbial phytase and calcium (Ca) levels on the Zn bioavailability depending on the Zn source.2. A total of 144, one-day-old broilers received a diet containing 40 mg Zn/kg for 1 week. They were then assigned to one of the eight experimental treatments during 2 weeks. Diets contained 27 mg native Zn and were formulated according to a 2 × 2 × 2 factorial design with two added Zn sources (23 mg Zn/kg), sulphate (ZnSO₄) or oxide (ZnO); two dietary Ca levels of either 6 (low) or 10 g/kg (moderate); and two microbial phytase levels, of either 0 or 750 phytase unit/kg.3. Moderate Ca plus phytase improved body weight gain (BWG) and low Ca level without microbial phytase decreased tibia weight (Ca × Phy; p = 0.049). Zinc oxide resulted in a higher tibia development (i.e. tibia weight and length; p < 0.05) and BWG (p = 0.009) and lower FCR (p < 0.001) compared to ZnSO₄.4. Phytase improved tibia Zn concentration especially in birds given ZnSO₄ compared to ZnO (Zn × Phy; p = 0.049). Moderate Ca diets improved tibial characteristics and Zn deposition compared to low Ca diets (p < 0.05).5. Soluble Zn in the gizzard increased in the presence of phytase (p = 0.011), while higher dietary Ca reduced this in birds receiving ZnO (p = 0.004). In the jejunum, Zn solubility was higher with phytase (p = 0.008).6. Under the conditions of this study, dietary levels of Ca and microbial phytase affect Zn availability in broilers more than the Zn source.

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日粮钙和微生物植酸酶对肉鸡两种锌源生物利用率的影响。

1.本研究的目的是测试微生物植酸酶和钙（Ca）水平对锌生物利用率的影响，具体取决于锌的来源。 144 只一天龄的肉鸡连续 1 周饲喂含 40 毫克锌/千克的日粮。然后在 2 周内将它们分配到 8 个实验处理之一。日粮含 27 毫克原生锌，按照 2 × 2 × 2 因子设计配制，添加两种锌源（23 毫克锌/千克），硫酸盐（ZnSO4）或氧化物（ZnO）；两种日粮钙含量，6 克/千克（低）或 10 克/千克（适度）；两种微生物植酸酶含量，0 或 750 植酸酶单位/千克。中度钙加植酸酶提高了体重增加（BWG），而低钙水平（无微生物植酸酶）降低了胫骨重量（钙×植酸；p = 0.049）。氧化锌可提高胫骨发育（即胫骨重量和长度；p = 0.009），降低 FCR（p 4.4。与氧化锌（Zn × Phy；p = 0.049）相比，植酸酶提高了胫骨的锌浓度，尤其是在饲喂 ZnSO4 的家禽中。与低钙日粮相比，中钙日粮改善了胫骨特征和锌沉积（p = 0.011），而高钙日粮则降低了接受氧化锌的鸟类的胫骨特征和锌沉积（p = 0.004）。在空肠中，植酸酶的锌溶解度更高（p = 0.008）。 6. 在本研究的条件下，日粮中的钙和微生物植酸酶水平对肉鸡锌利用率的影响大于锌来源。

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来源期刊

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

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 .