Abdelqader Anas, Mahasneh Zeinab M H, Van Hoeck Veerle, Abuajamieh Mohannad, Abedal-Majed Mohamed, Al-Qaisi Mohmmad, Irshaid Rabie, Al-Khaza'leh Ja'far
Department of Animal Production, School of Agriculture, The University of Jordan, Amman 11942, Jordan.
Department of Animal Production and Protection, Faculty of Agriculture, Jerash University, Jerash 26150, Jordan.
Poult Sci. 2025 Sep 11;104(11):105834. doi: 10.1016/j.psj.2025.105834.
The present study investigated the effects of supplementing broiler chicken diets with green seaweed Ulva lactuca (SW), an enzyme mixture (Enz), or their combination (SW+Enz) on growth performance, immune index, intestinal morphology, nutrients digestibility, cecal microbiota balance, and cecal short chain fatty acid (SCFA) concentrations. A total of 960 one-day-old male Ross 308 broiler chickens were reared under standard management practices for 35 days. Four dietary treatments were randomly assigned across 12 replicates per treatment (20 chicks each). The treatments included: (C) a control diet (basal); (Enz) control diet supplemented with Enz (250 mg/kg); (SW) a SW diet (10 g/kg); and (SW+Enz) SW+ Enz combination (at the aforementioned doses). Results showed that all supplemented groups significantly improved body weight gain and feed conversion ratio (FCR) (P < 0.05) compared to the control, with the SW+Enz group achieving the highest values. Specifically, FCR improved by 7.4 % (P < 0.05) with individual SW or Enz supplementation, and by 12.3 % (P < 0.05) with the SW+Enz combination, all relative to the control diet. Supplementation with either Enz or SW alone enhanced (P < 0.05) the digestibility coefficients for crude protein and gross energy (GE). Additionally, these individual treatments led to an increased retention (P < 0.05) of AME and AMEn when compared to the control group. The combination of SW+Enz led to significantly greater (P < 0.05) improvements in the digestibility coefficients of crude fat, starch, GE, NDF, ADF, AME, and AMEn when compared with individual inclusion. Relative to the control, single SW inclusion significantly enhanced energy retention by 4 % and protein retention by 6 % (P < 0.05). The synergistic effect of combined SW+ENZ further improved energy retention by 9.1 % and protein retention by 11.7 % (P < 0.05). The SW+Enz combination demonstrated significant improvements (P < 0.05) across several parameters, including the immune index, intestinal villus height, and villus surface area, surpassing other treatment groups. Furthermore, this combination resulted in higher counts of beneficial cecal bacteria and increased SCFA concentrations (P < 0.05) compared to supplementing with SW alone. These findings highlight SW+Enz as a promising sustainable feed additive for poultry production, aligning with growing interest in alternatives that enhance productivity while reducing reliance on antibiotics and synthetic growth promoters.
本研究调查了在肉鸡日粮中添加绿海藻石莼（SW）、酶混合物（Enz）或它们的组合（SW+Enz）对生长性能、免疫指标、肠道形态、养分消化率、盲肠微生物群平衡和盲肠短链脂肪酸（SCFA）浓度的影响。总共960只1日龄雄性罗斯308肉鸡按照标准管理方法饲养35天。四种日粮处理方式随机分配到每个处理的12个重复组中（每组20只雏鸡）。处理方式包括：（C）对照日粮（基础日粮）；（Enz）添加酶（250毫克/千克）的对照日粮；（SW）石莼日粮（10克/千克）；以及（SW+Enz）SW+Enz组合（上述剂量）。结果表明，与对照组相比，所有添加组的体重增加和饲料转化率（FCR）均显著提高（P<0.05），其中SW+Enz组的值最高。具体而言，单独添加SW或Enz时，FCR相对于对照日粮提高了7.4%（P<0.05），而SW+Enz组合则提高了12.3%（P<0.05）。单独添加Enz或SW均可提高（P<0.05）粗蛋白和总能（GE）的消化系数。此外，与对照组相比，这些单独的处理导致AME和AMEn的保留增加（P<0.05）。与单独添加相比，SW+Enz组合使粗脂肪、淀粉、GE、NDF、ADF、AME和AMEn的消化系数显著提高（P<0.05）。相对于对照组，单独添加SW可使能量保留显著提高4%，蛋白质保留提高6%（P<0.05）。SW+ENZ组合的协同作用进一步使能量保留提高了9.1%，蛋白质保留提高了11.7%（P<0.05）。SW+Enz组合在包括免疫指标、肠绒毛高度和绒毛表面积等多个参数上均有显著改善（P<0.05），超过了其他处理组。此外，与单独添加SW相比，这种组合导致有益盲肠细菌数量增加和SCFA浓度升高（P<0.05）。这些发现突出了SW+Enz作为一种有前景的可持续家禽生产饲料添加剂，符合人们对在提高生产力的同时减少对抗生素和合成生长促进剂依赖的替代品的兴趣日益增加的趋势。
