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Growth performance, carcass characteristics, ileal microbiota, and amino acid digestibility of broilers fed diets varying in supplemental copper concentrations and amino acid density from 1 to 32 d of age1
Journal of Applied Poultry Research ( IF 1.9 ) Pub Date : 2020-12-09 , DOI: 10.1016/j.japr.2020.100135
S.C. Philpot , K.R. Perryman , K.S. Macklin , W.A. Dozier

Two experiments were designed to determine interactive effects of supplemental dietary Cu and amino acid (AA) density on growth performance, processing characteristics, ileal microflora, and AA digestibility of broilers. In experiment 1, 8 dietary treatments were used, consisting of a factorial arrangement of 3 Cu programs providing Cu concentrations of 135-135-135, 270-135-135, or 270-270-135 mg/kg in starter, grower, and finisher periods, formulated at moderate or low AA density, positive and negative controls. The Cu source was tribasic Cu chloride. In both experiments, control birds were provided with diets formulated to moderate AA density and approximately 13 mg/kg Cu. Broilers fed positive control diets were unvaccinated and received diets containing a coccidiostat, while all other birds were vaccinated against coccidiosis. The results indicated that feeding high concentrations of dietary Cu may decrease feed conversion ratio through reduced feed intake. This led to reduced carcass weight and yield, but did not affect breast meat weight and yield. No differences were observed for microflora composition. Experiment 2 evaluated apparent ileal AA digestibility and used 6 dietary treatments, consisting of positive and negative controls and a factorial of either 135 or 270 mg/kg Cu and low or moderate AA density. Copper treatments reduced Cys digestibility compared with negative control–fed birds, and only Trp digestibility was increased with Cu supplementation. These studies indicate that feeding high concentrations of Cu may enhance growth performance but did not improve digestibility of most AA or alter microflora profile.



中文翻译:

生长性能,胴体特性,回肠微生物群,以及肉鸡的氨基酸消化率日粮中补充铜的浓度变化和从1到32的d年龄氨基酸密度1

设计了两个实验来确定补充膳食铜和氨基酸(AA)的相互作用密度对肉鸡生长性能,加工特性,回肠菌群和AA消化率的影响。在实验1中,使用了8种饮食处理方法,其中包括3种Cu程序的分项安排,在初始,生长和生长过程中,Cu的浓度分别为135-135-135、270-135-135或270-270-135 mg / kg。整理期,以中等或低AA浓度配制,阳性和阴性对照。铜源是三元氯化铜。在两个实验中,都为对照禽提供了适度AA浓度和约13 mg / kg Cu的日粮。饲喂阳性对照日粮的肉鸡不接种疫苗,并接受含球虫抑制剂的日粮,而其他所有鸡只均接种了球虫病疫苗。结果表明,饲喂高浓度的日粮铜可能通过减少采食量而降低饲料转化率。这导致reduced体重量和产量降低,但不影响胸肉重量和产量。没有观察到微生物群落组成的差异。实验2评估了明显的回肠AA消化率,并使用了6种饮食疗法,包括阳性和阴性对照以及135或270 mg / kg Cu的析因和较低或中等的AA密度。与阴性对照喂养的鸟类相比,铜处理降低了Cys的消化率,而添加Cu仅增加了Trp的消化率。这些研究表明,饲喂高浓度的铜可以提高生长性能,但不能改善大多数AA的消化率或改变菌群分布。这导致reduced体重量和产量降低,但不影响胸肉重量和产量。没有观察到微生物群落组成的差异。实验2评估了明显的回肠AA消化率,并使用了6种饮食疗法,包括阳性和阴性对照以及135或270 mg / kg Cu的析因和较低或中等的AA密度。与阴性对照喂养的鸟类相比,铜处理降低了Cys的消化率,而添加Cu仅增加了Trp的消化率。这些研究表明,饲喂高浓度的铜可以提高生长性能,但不能改善大多数AA的消化率或改变菌群分布。这导致reduced体重量和产量降低,但不影响胸肉重量和产量。没有观察到微生物群落组成的差异。实验2评估了明显的回肠AA消化率,并使用了6种饮食疗法,包括阳性和阴性对照以及135或270 mg / kg Cu的析因和较低或中等的AA密度。与阴性对照喂养的鸟类相比,铜处理降低了Cys的消化率,而添加Cu仅增加了Trp的消化率。这些研究表明,饲喂高浓度的铜可以提高生长性能,但不能改善大多数AA的消化率或改变菌群分布。实验2评估了明显的回肠AA消化率,并使用了6种饮食疗法,包括阳性和阴性对照以及135或270 mg / kg Cu的析因和较低或中等的AA密度。与阴性对照喂养的鸟类相比,铜处理降低了Cys的消化率,而添加Cu仅增加了Trp的消化率。这些研究表明,饲喂高浓度的铜可以提高生长性能,但不能改善大多数AA的消化率或改变菌群分布。实验2评估了明显的回肠AA消化率,并使用了6种饮食疗法,包括阳性和阴性对照以及135或270 mg / kg Cu的析因和较低或中等的AA密度。与阴性对照喂养的鸟类相比,铜处理降低了Cys的消化率,而添加Cu仅增加了Trp的消化率。这些研究表明,饲喂高浓度的铜可以提高生长性能,但不能改善大多数AA的消化率或改变菌群分布。

更新日期:2021-01-16
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