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后续肉鸡对添加或不添加植酸酶的低锌日粮的体轴和骨组织代谢反应。

Subsequent somatic axis and bone tissue metabolism responses to a low-zinc diet with or without phytase inclusion in broiler chickens.

作者信息

Muszyński Siemowit, Tomaszewska Ewa, Kwiecień Małgorzata, Dobrowolski Piotr, Tomczyk-Warunek Agnieszka

机构信息

Department of Physics, Faculty of Production Engineering, University of Life Sciences in Lublin, Lublin, Poland.

Department of Animal Physiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Lublin, Poland.

出版信息

PLoS One. 2018 Jan 26;13(1):e0191964. doi: 10.1371/journal.pone.0191964. eCollection 2018.

Abstract

Zinc is required for normal bone development and cartilage formation. The purpose of this study was to assess the effect of with adding organic Zn (alone or phytase inclusion) at the reduced dose to growing male Ross 308 chickens on somatic axis and bone tissue metabolism. 200 one-day old broilers were divided into the negative control group fed diet without Zn or phytase inclusion, positive control group receiving Zn in the 100% of daily recommended dose from ZnO, and two experimental groups fed diet introduced Zn in 25% of daily recommendation as a glycine chelate (Zn-Gly) with or without phytase inclusion (500 FTU·kg-1). Supplemental organic Zn increased bone Zn and Mg content, serum IGF-1, growth hormone and leptin concentration. Additional phytase inclusion increased body weight gain, blood plasma Ca, Fe, Zn and osteocalcin concentration and tibia ash percentage when compared to the Zn-deprived control. Bone geometry, yield and ultimate strengths were enhanced in both organic Zn supplemented groups, and the overall mechanical strength parameters of bone were better in these groups than in the positive control group supplemented with standard dose of inorganic Zn. Also marked improvements in the thickness of articular and the growth plate cartilages as well as real bone volume and thickness of metaphyseal trabeculae were achieved in all broilers fed Zn-supplemented diet irrespective of phytase inclusion, however, the highest cancellous bone mass and the best trabecular structure were noted after ZnO supplementation. In concludion, although dietary organic Zn given to growing broilers in 25% of daily recommended dose improved general bone properties and mechanical strength, the obtained results do not allow to unambiguously state that organic Zn supplementation at this level, even after phytase inclusion, is sufficient for proper bone development.

摘要

正常的骨骼发育和软骨形成需要锌。本研究的目的是评估在生长中的雄性罗斯308肉鸡日粮中添加低剂量有机锌(单独添加或添加植酸酶)对躯体轴和骨组织代谢的影响。将200只1日龄肉鸡分为阴性对照组,饲喂不添加锌或植酸酶的日粮;阳性对照组,从氧化锌中摄入100%每日推荐剂量的锌;两个实验组,日粮中添加25%每日推荐剂量的甘氨酸螯合锌(Zn-Gly),其中一组添加植酸酶(500 FTU·kg-1),另一组不添加。补充有机锌可增加骨锌和镁含量、血清IGF-1、生长激素和瘦素浓度。与缺锌对照组相比,额外添加植酸酶可增加体重增加、血浆钙、铁、锌和骨钙素浓度以及胫骨灰分百分比。两个添加有机锌的组的骨几何形状、屈服强度和极限强度均得到增强,且这些组的骨整体力学强度参数优于添加标准剂量无机锌的阳性对照组。无论是否添加植酸酶,在所有饲喂补锌日粮的肉鸡中,关节软骨和生长板软骨的厚度以及干骺端小梁的实际骨体积和厚度也都有显著改善,然而,补充氧化锌后松质骨质量最高,小梁结构最佳。总之,虽然给生长中的肉鸡饲喂25%每日推荐剂量的日粮有机锌可改善一般骨骼特性和力学强度,但所得结果无法明确表明在此水平添加有机锌,即使添加植酸酶后,对于骨骼的正常发育也是足够的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/311c/5786321/fc9860034e59/pone.0191964.g001.jpg

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