Effects Of Marine Rhodotorula On Growth Performance, Carcass Traits And Apparent Nutrient Digestibility In Broilers

As consumer and government in conflicting and restriction on antibiotics is getting worse, breeding enterprises have looked more toward to the green, high efficiency, no pollution micro-ecological production as an alternative to instead of antibiotics. This test is designed to investigate the Marine Rhodotorula BSH and compound probiotics on growth performance, carcass traits, small intestinal morphology and apparent nutrient digestibility of broilers, respectively. So as to provide a theoretical basis for probiotic partly replace antibiotics in broilers production.The first experiment was conducted to study the effects of Rhodotorula Mucilaginosa BSH on growth performance, carcass traits, small intestinal morphology and apparent nutrient digestibility of broilers. A total of 300 one-day-old health AA broilers were randomly assigned to 5 groups, each group had 3 repeats, and each repeat had 20 chickens.Each group was fed the basal diet. The chickens in groupⅠwas the control group, drank normal water; group Ⅱ was the antibiotics group, supplemented with Enrofloxacin and Colistin Sulfate; groups Ⅲ, Ⅳ and Ⅴ were Marine Rhodotorula BSH groups,supplemented with 5×105cfu/ml, 1×106cfu/ml and 1.5×106cfu/ml Marine Rhodotorula BSH,respectively. The experiment lasted for 42 days.The results showed that:(1) The supplementation of Marine Rhodotorula BSH can significant improve ADG and ADFI(P<0.05), reduce mortality and abdominal fat rate(P<0.05), and increase apparent nutrient digestibility(P<0.05) of broilers;(2) The supplementation of 1.5×106cfu/ml Marine Rhodotorula BSH showed the best positive effects.The second study was conducted to study the effects of compound probiotics on growth performance, carcass traits, small intestinal morphology and apparent nutrient digestibility of broilers. A total of 300 one-day-old health AA broilers were randomly assigned to 5 groups, each group had 3 repeats, and each repeat had 20 chickens. Each group was fed with basal diet. The chickens in groupⅠwas the control group, drank normal water; group Ⅱ was the antibiotics group, supplemented with Enrofloxacin and Colistin Sulfate; groups Ⅲ, Ⅳ and Ⅴ were compound probiotics groups, supplemented with 5×105cfu/ml Marine Rhodotorula BSH, 1×107cfu/g Bacillus Subtilis and 1×106cfu/g Lactic Acid Bacteria; 1×106cfu/ml Marine Rhodotorula BSH, 2×107cfu/g Bacillus Subtilis and 2×106cfu/g Lactic Acid Bacteria; 1.5×106cfu/ml Marine Rhodotorula BSH, 3×107cfu/g Bacillus Subtilis and 3×106cfu/g Lactic Acid Bacteria, respectively. The experiment lasted for 42 days. The results showed that:(1) The broilers supplemented with compoundprobiotics could significant increase the ADG,ADFI and survival rate(P<0.05); slaughter rate, breast muscle rate and leg muscle rate were increased but no significant differences(P>0.05), and abdominal fat rate was reduced significant(P<0.05); The apparent nutrient digestibility of energy, DM, CP and EE were significant increased; The V/C vaule of each intestinal tract was significant increased(P<0.05);(2) The supplementation of1.5×106cfu/ml Marine Rhodotorula BSH, 3×107cfu/g Bacillus Subtilis and 3×106cfu/g Lactic Acid Bacteria showed the best positive effects.To conclude, Marine Rhodotorula BSH and the compound probiotics can significant effect on growth performance, carcass traits, apparent nutrient digestibility and small intestinal morphology. It is feasible that broilers supplemented with probiotics can partly replace antibiotics in the scale of feeding.