E Deeb Salma, Ashour Elwy A, Abd El-Hack Mohamed E, El-Maaty Mohamed Abou, Youssef Islam M, Adil Sheikh, Elolimy Ahmed A, Swelum Ayman A
Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt.
2M Group, Sharqia, Egypt.
Poult Sci. 2024 Dec;103(12):104396. doi: 10.1016/j.psj.2024.104396. Epub 2024 Oct 10.
The objective of the present study was to ascertain the influence of thyme leaf powder (TLP) on growth rate, carcass features, and blood indicators in broiler diets as a natural antioxidant and antibiotic substitute. A fully randomized design experiment divided 264-day-old broiler chicks (Ross 308) into 4 experimental groups. Six replicates of each group, each containing 11 unsexed chicks, were created. The following were the therapies: control group without additive (basal diet); TLP1, TLP2 and TLP3: basal diet + 1, 2 and 3 g thyme leaves powder/kg diet, respectively. Results showed that TLP added at 2 or 3 g/kg of feed significantly enhanced body weight gain (except for the period from 16 to 30 d of life), feed intake (except for the period from 1 to 15 d of life), and feed conversion ratio throughout study period. Furthermore, there was a significant decrease in creatinine and alanine aminotransferase (ALT) with different TLP levels, particularly at a 3 g TLP/kg diet. Compared with the control group, the birds' 2 g TLP/kg diet included the highest levels of albumin and total protein and A/G (albumin/globulin) ratio. Furthermore, the birds fed 1 g TLP/kg feed had the lowest concentrations of low-density lipoprotein (LDL) and total cholesterol (TC). Moreover, chicks fed all treatment diets containing TLP had higher IgY concentrations than the control group. Nevertheless, the group that was fed a diet including 2 g TLP/kg had the highest IgM levels. Additionally, the superoxide dismutase activity (SOD) levels were highest in the birds fed a 1g TLP/kg diet and minimum in the birds fed the control diet. Notably, malondialdehyde (MDA) levels were maximum in birds fed a control meal and lowest in birds with a diet containing 1 g of TLP/kg. We may conclude that using TLP in broiler diets increases the birds' immunity, productivity, and overall health, especially at level 2 g of TLP/kg diet.
本研究的目的是确定百里香叶粉（TLP）作为天然抗氧化剂和抗生素替代品对肉鸡日粮中生长速度、胴体特征和血液指标的影响。一项完全随机设计实验将264只1日龄的肉鸡雏鸡（罗斯308）分为4个实验组。每组设置6个重复，每个重复包含11只未分性别的雏鸡。实验处理如下：无添加剂的对照组（基础日粮）；TLP1、TLP2和TLP3组：基础日粮分别 + 1、2和3 g百里香叶粉/千克日粮。结果表明，在整个研究期内，添加2或3 g/千克饲料的TLP显著提高了体重增加（16至30日龄阶段除外）、采食量（1至15日龄阶段除外）和饲料转化率。此外，不同TLP水平组的肌酐和丙氨酸转氨酶（ALT）显著降低，尤其是在3 g TLP/千克日粮组。与对照组相比，2 g TLP/千克日粮组的鸡白蛋白、总蛋白水平以及A/G（白蛋白/球蛋白）比值最高。此外，饲喂1 g TLP/千克饲料的鸡低密度脂蛋白（LDL）和总胆固醇（TC）浓度最低。而且，所有饲喂含TLP日粮处理组的雏鸡IgY浓度均高于对照组。然而，饲喂2 g TLP/千克日粮组的鸡IgM水平最高。另外，超氧化物歧化酶活性（SOD）水平在饲喂1 g TLP/千克日粮的鸡中最高，在饲喂对照日粮的鸡中最低。值得注意的是，丙二醛（MDA）水平在饲喂对照日粮的鸡中最高，在饲喂1 g TLP/千克日粮的鸡中最低。我们可以得出结论，在肉鸡日粮中使用TLP可提高鸡的免疫力、生产力和整体健康状况，尤其是在2 g TLP/千克日粮水平时。
