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在添加植酸酶的日粮中,铁水平升高会降低肉鸡的生产性能和养分利用率。

Increased iron level in phytase-supplemented diets reduces performance and nutrient utilisation in broiler chickens.

作者信息

Akter Marjina, Iji P A, Graham H

机构信息

a Animal Science Department, School of Environmental and Rural Science , University of New England , Armidale , Australia.

b Animal Science, School of Rural Science & Agriculture , University of New England , Armidale , Australia.

出版信息

Br Poult Sci. 2017 Aug;58(4):409-417. doi: 10.1080/00071668.2017.1315050. Epub 2017 Jun 13.

DOI:10.1080/00071668.2017.1315050
PMID:28398093
Abstract
  1. The effect of different levels of dietary iron on phytase activity and its subsequent effect on broiler performance were investigated in a 3 × 2 factorial arrangement. A total of 360 day-old Ross 308 male broiler chicks were distributed to 6 experimental diets, formulated with three levels of Fe (60, 80 and 100 mg/kg) and two levels of phytase (0 and 500 FTU/kg). 2. Phytase supplemented to mid-Fe diets increased feed consumption more than the non-supplemented diet at d 24. From hatch to d 35, Fe × phytase interaction significantly influenced the feed intake (FI), body weight gain (BWG) and feed conversion ratio (FCR). The high-Fe diet supplemented with phytase significantly reduced FI and BWG of broilers than those supplemented with low- or mid-Fe diets. The overall FCR was significantly better in birds fed on the mid-Fe diets with phytase supplementation. 3. A significant improvement in ileal digestibility of N, P, Mg and Fe was observed in birds feed diets containing 60 mg Fe/kg, with significant interaction between Fe and phytase. 4. Phytase improved the bone breaking strength when supplemented to low- or mid-Fe diets, compared to the non-supplemented diets. There was a significant Fe × phytase interaction effect. Tibia Fe content was higher in birds fed on phytase-free diets with high Fe but the reverse was the case when phytase was added and their interaction was significant. High dietary Fe significantly increased the accumulation of Fe in liver. 5. Phytase improved Ca-Mg-ATPase, Ca-ATPase and Mg-ATPase activities in jejunum when supplemented to the diet containing 80 mg Fe/kg. 6. This study indicates that high (100 mg/kg) dietary Fe inhibited phytase efficacy and subsequently reduced the overall performance and nutrient utilisation of broilers.
摘要
  1. 采用3×2析因设计,研究了不同水平的饲粮铁对植酸酶活性及其随后对肉鸡生产性能的影响。总共360只1日龄罗斯308雄性肉鸡雏鸡被分配到6种试验饲粮中,这些饲粮分别添加三种水平的铁(60、80和100毫克/千克)和两种水平的植酸酶(0和500酶活性单位/千克)。2. 在第24天时,添加到中等铁水平饲粮中的植酸酶比未添加的饲粮增加了采食量。从出雏到第35天,铁×植酸酶互作显著影响采食量(FI)、体重增加(BWG)和饲料转化率(FCR)。添加植酸酶的高铁饲粮比添加低铁或中铁饲粮显著降低了肉鸡的采食量和体重增加。在添加植酸酶的中等铁水平饲粮中饲养的鸡,总体饲料转化率显著更好。3. 在含60毫克铁/千克的饲粮中饲养的鸡,回肠氮、磷、镁和铁的消化率有显著提高,铁和植酸酶之间有显著互作。4. 与未添加植酸酶的饲粮相比,在低铁或中铁饲粮中添加植酸酶可提高骨骼断裂强度。存在显著的铁×植酸酶互作效应。在不添加植酸酶的高铁饲粮中饲养的鸡胫骨铁含量较高,但添加植酸酶时情况相反,且它们的互作显著。高饲粮铁显著增加了肝脏中铁的蓄积。5. 在含80毫克铁/千克的饲粮中添加植酸酶时,可提高空肠中钙-镁-ATP酶、钙-ATP酶和镁-ATP酶的活性。6. 本研究表明,高(100毫克/千克)饲粮铁抑制了植酸酶的功效,随后降低了肉鸡的总体生产性能和养分利用率。

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