PDF(Pubmed)
Abstract：
This study investigated the effects of different doses of limestone, light durations, light intensities, and vitamins on both the productive performance and egg quality. The study utilized two rearing houses (control and treatment), each accommodating 75000 Lohmann Brown Classic chicks reared in open-sided rearing cages from one day old until they reached 89 weeks of age. Throughout the laying period, the hens were subjected to a specific light regimen (light = 14 h; dark = 10 h a day). At the end of experiment, the treatment group displayed significant (p<0.05) differences compared to the control group across various parameters. Notably, the treatment group exhibited lower daily feed intake (treatment: 112 g/bird vs control: 115 g/bird), 9.6% higher egg production (treatment: 78.5% vs control: 68.9%), lower body weight (treatment: 2057 g vs control: 2073 g), lower feed conversion ratio (FCR)/egg (treatment: 1.44 vs control: 1.69), higher egg weight (treatment: 69.4 g vs control: 68.5 g), greater egg mass (treatment: 56.14 vs control: 48.76), greater shell thickness (treatment: 3.52 mm vs control: 3.44 mm), and greater shell weight (treatment: 9.3 g vs control: 8.79 g). However, the albumin weight, yolk weight, yolk diameter, shape index, and Haugh units (HU) were not significantly (p˃0.05) affected after 75 weeks of treatment when compared with those of the control group. Therefore, this study is the first of its kind to demonstrate that different ratios of limestone, different durations and intensities of light, and different vitamin supplementation doses in the treatment group (subjected to the novel rearing recommendations described in this study) may yield a profit of 180,541 USD, exceeding the baseline profit of the control group (subjected to conventional rearing methods).
摘要：
这项研究调查了不同剂量的石灰石的影响，光照持续时间,光强度,和维生素对生产性能和鸡蛋质量的影响。这项研究利用了两个饲养房屋(控制和治疗)，每只可容纳75000只LohmannBrownClassic小鸡，从一天大一直饲养到89周大。在整个产卵期间，母鸡接受特定的光照方案（光照=14小时；黑暗=每天10小时）。实验结束时,与对照组相比,治疗组在各种参数方面表现出显著差异(p<0.05)。值得注意的是,处理组表现出较低的每日采食量（处理：112克/鸟vs对照组：115克/鸟），鸡蛋产量提高9.6％（处理：78.5％，对照组：68.9％），较低的体重（治疗：2057克，对照组：2073克），较低的饲料转化率（FCR）/鸡蛋（处理：1.44vs对照：1.69），更高的鸡蛋重量（处理：69.4gvs对照：68.5g），更大的卵质量（处理：56.14vs对照：48.76），更大的外壳厚度（处理：3.52毫米vs对照：3.44毫米），和更大的壳重量（治疗：9.3gvs对照：8.79g）。然而,白蛋白重量，蛋黄重量,蛋黄直径,形状指数，与对照组相比，治疗75周后，Haugh单位（HU）没有显着影响（p＝0.05）。因此,这项研究是首次证明不同比例的石灰石，不同的持续时间和强度的光，和治疗组的不同维生素补充剂量（接受本研究中描述的新型饲养建议）可能产生180,541美元的利润，超过对照组的基线利润(采用常规饲养方法)。
