Animal and Poultry Production Department, Faculty of Agriculture, Beni-Suef University, Beni Suef, Egypt.
Animal and Poultry Physiology Department, Desert Research Center, Cairo, Egypt.
Sci Rep. 2024 Jul 23;14(1):16884. doi: 10.1038/s41598-024-66595-9.
The increase in environmental temperature led to economic losses in the poultry industry, urging the use of feed supplements to mitigate the negative effects on chick's welfare and performance. Therefore, this study aimed to examine the effects of marine microalgae (Nannochloropsis Oculata, N. Oculata) additive on commercial Brown Lohmann laying hen's performance, blood metabolites, and antioxidant status under hot environmental conditions. One hundred and eighty birds (34 weeks old with an initial body weight of 1885 ± 23.5 g) were used till 47 weeks. The birds were divided into three equal groups (birds in each group were distributed into four equal replicates 15 hens/ replicate). The 1st group was the control (CON) and was fed the basal diet, while the 2nd (TR1) and 3rd (TR2) groups were fed the basal diet supplemented with 0.5 and 1.0% of N. Oculata, respectively. The results showed that total protein and globulin concentrations increased (P < 0.05) in treated groups compared with the control group, whereas, albumin concentration increased (P < 0.05) in TR2 compared to the control group. The concentration of ALT and AST decreased in hens fed N. Oculata. Supplementing with N. Oculata reduced serum cholesterol and creatinine concentrations, while glucose concentration increased (P < 0.05) in the treated groups compared to the control group. Serum calcium, total antioxidant capacity (TAC), Triiodothyronine (T3), and progesterone increased (P < 0.05) in hens fed N. Oculata. N. Oculata supplement improved production performance through a positive effect on egg number, egg weight, egg mass, feed conversion ratio, and mortality rate. In addition, the overall mean of shell thickness increased (P < 0.05) in hens fed N. Oculata. It can be concluded that the supplementation of 1.0% N. Oculata to the laying hens' diet enhanced productive performance, serum constituents, and antioxidant status under hot environmental conditions.
环境温度升高导致家禽业遭受经济损失，促使人们使用饲料添加剂来减轻对雏鸡福利和性能的负面影响。因此，本研究旨在研究海洋微藻（Nannochloropsis oculata，N. oculata）添加剂对热环境条件下商品褐壳蛋鸡生产性能、血液代谢物和抗氧化状态的影响。使用 180 只鸡（34 周龄，初始体重为 1885±23.5g）直至 47 周。将鸡分为三组（每组鸡分为 4 个相等的重复，每个重复 15 只母鸡）。第一组为对照组（CON），饲喂基础日粮，第二组（TR1）和第三组（TR2）分别饲喂基础日粮添加 0.5%和 1.0%的 N. oculata。结果表明，与对照组相比，处理组的总蛋白和球蛋白浓度增加（P<0.05），而 TR2 组的白蛋白浓度增加（P<0.05）。补充 N. oculata 可降低母鸡血清 ALT 和 AST 浓度。补充 N. oculata 可降低血清胆固醇和肌酐浓度，同时提高葡萄糖浓度（P<0.05）。与对照组相比，处理组的血清钙、总抗氧化能力（TAC）、三碘甲状腺原氨酸（T3）和孕酮增加（P<0.05）。补充 N. oculata 可改善生产性能，通过对蛋数、蛋重、蛋重、饲料转化率和死亡率的积极影响。此外，饲喂 N. oculata 的母鸡的蛋壳厚度平均值增加（P<0.05）。综上所述，在蛋鸡日粮中添加 1.0%的 N. oculata 可以提高生产性能、血清成分和抗氧化状态。
