Department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt.
Specialized Hospital, Ain Shams University, Cairo, Egypt.
Biol Trace Elem Res. 2018 Nov;186(1):162-173. doi: 10.1007/s12011-018-1293-2. Epub 2018 Mar 7.
The effect of organic selenium, prebiotics, or probiotics on productive performances, blood biochemistry, and carcass characteristics of growing rabbits was studied throughout summer and winter seasons. In an 8-week feeding trial, a total of 100 New Zealand White rabbits were randomly distributed to 10 groups. Two seasons (winter and summer) and five diets fortified with 0 (control), 0.03 mg selenium, 3 g Bio-Mos®, 1 g Bactocell® (1 × 10 CFU) or 3 g yeast/kg diet were used in 2 × 5 factorial design. Results indicated that growth performance, feed intake (FI), and blood components (red blood cells [RBCs], serum total protein [TP], globulin [GLOB], albumin [ALB]) decreased significantly in rabbits reared during summer than in those during winter. In contrast, white blood cells, urea-N, creatinine, alanine transaminase [ALT], and aspartate transaminase [AST] increased significantly in summer. However, growth performance indices, FI, blood hemoglobin, RBCs, TP, ALB, and GLOB increased significantly in rabbits when fed the tested feed additives. The respiration rate, rectal temperature, and heart rate of the animals were significantly decreased with all feed additives. Adjusted weight of carcass, liver, kidney fat, and carcass cuts were not affected by feed additives. Final margin and margin efficiency increased in rabbit fed diets supplemented with feed additives than those fed the basal diet without any supplementation. Results of the current study concluded that a supplementation of rabbit diets with organic selenium, probiotics, and prebiotics can promote rabbit performance during mild weather and also alleviate the adverse impact of heat stress during summer season.
在夏季和冬季研究了有机硒、益生元和益生菌对生长兔生产性能、血液生化和胴体特性的影响。在为期 8 周的饲养试验中，将 100 只新西兰白兔随机分配到 10 个组中。采用 2 个季节（冬季和夏季）和 5 种日粮（对照组、0.03mg 硒、3g Bio-Mos®、1g Bactocell®（1×10 CFU）或 3g 酵母/千克日粮），进行 2×5 因子设计。结果表明，夏季饲养的兔子生长性能、采食量（FI）和血液成分（红细胞[RBC]、血清总蛋白[TP]、球蛋白[GLOB]、白蛋白[ALB]）显著下降，而冬季饲养的兔子则显著下降。相反，夏季白细胞、尿素氮、肌酐、丙氨酸转氨酶[ALT]和天冬氨酸转氨酶[AST]显著增加。然而，当给兔子喂食测试的饲料添加剂时，生长性能指标、FI、血液血红蛋白、RBC、TP、ALB 和 GLOB 显著增加。动物的呼吸率、直肠温度和心率均显著降低。饲料添加剂对胴体、肝脏、肾脏脂肪和胴体切块的重量没有影响。与基础日粮（无任何添加）相比，添加饲料添加剂的日粮能提高兔子的最终利润和利润率。本研究的结果表明，在温和的天气下，在兔日粮中添加有机硒、益生菌和益生元可以促进兔子的生产性能，同时减轻夏季热应激的不利影响。
