Economic assessment.

This study was carried out to compare the impact of choline supplementation (available from two sources synthetic and natural) on various dosages in broilers. The mode of choline supplementation, via diet and additional sources, synthetic and natural, and the data of performance, carcass quality, blood parameters, and hepatic steatosis were compared. A total of 1050 day-old male Cobb 500 broiler chicks were randomly assigned to 10 treatments, using a completely randomized design model in a factorial scheme, with 6 replicates per treatment and 25 birds per replicate. Choline was supplemented using three sources: synthetic choline chloride 60% (CC), and two sources of natural choline A (NCA), and B (NCB). The Control treatment did not receive any choline supplementation. The diets were supplemented with low, intermediate and high doses of choline sources (400g/t, 800g/t, and 1200g/t of CC; 100g/t, 200g/t, and 300g/t of both NCA and NCB). Data analysis was performed using a factorial model to investigate the effects of choline supplementation (CC, NCA, NCB) and doses on the measured variables. Overall, the results indicated that the the performance of NCA was better than CC & NCB, specifically the dose of 100g/t of NCA outperformed MAR at 100g/t & CC at 400g/t, leading to a significant increase in body weight gain (85.66g & 168.84g respectively), and a noteworthy (9- & 12-point respectively) improvement in feed conversion ratio. Furthermore, NCA contributed to a reduction in steatosis when contrasted with various NCB & CC doses, likely due to the presence of curcumins and catechins in the natural choline source. These findings demonstrated that NCA supplementation yielded superior results compared to CC and NCB across both performance and liver health aspects in broilers aged 1 to 42 days. In conclusion, NCA can be used to replace the CC 60% without compromise on the zootechnical performance in broilers.本研究旨在探究合成与天然两种来源的胆碱补充剂及其不同添加剂量对肉鸡的影响。试验对比了通过日粮添加合成与天然来源胆碱的补充方式，以及肉鸡的生长性能、屠宰品质、血液生理指标与肝脂肪变性相关数据。本试验共选取1050只1日龄科宝500（Cobb 500）雄性肉鸡雏鸡，采用完全随机设计的析因方案，随机分为10个处理组，每组设6个重复，每个重复饲养25只肉鸡。胆碱补充剂共设置3种来源：60%合成氯化胆碱（CC）、两种天然胆碱来源A（NCA）与B（NCB）；空白对照组不添加任何胆碱补充剂。各组日粮分别添加低、中、高三种剂量的胆碱来源：合成氯化胆碱（CC）的添加量为400g/t、800g/t、1200g/t；天然胆碱A（NCA）与天然胆碱B（NCB）的添加量均为100g/t、200g/t、300g/t。本研究采用析因模型开展数据分析，以探究胆碱来源（CC、NCA、NCB）与添加剂量对各测定指标的影响。整体试验结果表明，天然胆碱A（NCA）的饲喂效果优于合成氯化胆碱（CC）与天然胆碱B（NCB）；其中添加剂量为100g/t的NCA组表现最优，其增重分别较100g/t的NCB组与400g/t的CC组显著提升85.66g与168.84g，料重比分别显著改善9与12个百分点。此外，相较于不同剂量的NCB与CC组，NCA可有效降低肝脂肪变性程度，这可能与其天然胆碱来源中含有的姜黄素与儿茶素有关。上述研究结果表明，在1~42日龄肉鸡的养殖中，添加NCA在生长性能与肝脏健康两方面均优于CC与NCB。综上，天然胆碱A（NCA）可替代60%合成氯化胆碱（CC），且不会对肉鸡的畜牧生产性能造成负面影响。