Effect Of Pediococcus Pentosaceus On Meat Quality In Different Growth Stages Of AA Broilers

The aim of the study was to determine the effect of Pediococcus pentosaceus on the growthperformance and meat quality of broiler chicken. A total of210AA chicks were randomly dividedinto7treatments （30for each treatment）. The experiment was completely randomized trialdesigned of single factor. The birds in the control group were fed the basal diet whereas in othertreatment groups basal diet was supplemented with10⁹cfu （4-6w）,10¹⁰cfu （4-6w）,1011cfu （4-6w）,10⁹cfu （1-6w）,10¹⁰cfu （1-6w） and1011cfu （1-6w）, and the experiment lasted for42days.The test results show that:（1） Growth performance: For4-6weeks broiler, feed weight ratio of group1011cfu （4-6w）,10⁹cfu （1-6w） and10¹⁰cfu （1-6w） was significantly lower compared with control group （p<0.05）;for1-6weeks broiler, feed weight ratio of10¹⁰cfu （1-6w） group was significantly lower than thecontrol group （p<0.05）. Slaughter performance: For6weeks broiler, the abdominal fat rate of10⁹cfu （4-6w） group was significantly lower than the control group （p<0.05）; breast muscle rate of10⁹cfu （1-6w） group and10¹⁰cfu （1-6w） group was significantly higher than that of control group（p<0.05）.（2） Meat quality:â‘ pH value: For3weeks broiler,24h pH muscle of10⁹cfu （1-6w） groupafter slaughter was significantly higher compared with control group （p<0.05）; for3weeks broiler,breast pH of10¹⁰cfu （1-6w）6week group was higher than that of control group （p<0.05）, legmuscle pH of10¹⁰cfu （4-6w） was higher than that of control group （p<0.05）. Shear forces: For3weeks broiler, breast muscle, leg muscle shear stress of test group have no significant differencecompared with the control group（p>0.05）; For6weeks broiler, shear force of breast muscle of10¹⁰cfu （1-6w） group of was significantly lower than the control group （p<0.05）.â‘¡water holdingcapacity: For3weeks broiler, breast muscle, leg muscle water holding capacity of eachexperimental group are lower than those of the control group; For6weeks broiler, muscle waterholding capacity of10⁹cfu （4-6w） and10¹⁰cfu （1-6w） is higher than that of control group.â‘¢f leshcolor: For3weeks broiler, leg muscle L^*of10¹⁰cfu （1-6w） group was significantly lowerthan that of the control group （p<0.05）; For6weeks broiler, breast muscle, leg muscle L^*values of10⁹cfu （4-6w） and10¹⁰cfu （1-6w） group were significantly lower than those in the control group（p<0.05）, leg muscle a^*values of10¹⁰cfu （1-6w） groupwas significantly higher compared with thecontrol group （p<0.05）, breast muscle b^*values of10⁹cfu （4-6w） group was significantly lower compared with the control group（p<0.05）.Routine nutritional composition of muscle: For3weeks broiler, crude fat of breast muscle,leg muscle of on10⁹cfu （1-6w）,10¹⁰cfu （1-6w） group were significantly lower than those in thecontrol group （p<0.05）; For6weeks broiler, leg muscle crude protein of10⁹cfu （4-6w）,10¹⁰cfu（1-6w） group of was significantly higher than that in control group （p<0.05）; crude fat of breastmuscle, leg muscle10⁹cfu （4-6w）,10¹⁰cfu （1-6w） group were significantly lower than those in thecontrol group （p<0.05）.（3） Serum biochemistry: For3weeks broiler, HDL-C, LDL-C and TG of test group comparedwith the control group, the difference was not significant （p>0.05）; CHOL of test group wassignificantly lower than the control group（p<0.05）. For6weeks broiler, LDL-C of10⁹cfu（1-6w）group was significantly lower than the control group （p<0.05）; TG of10¹⁰cfu （4-6w） and10¹⁰cfu（1-6w）group decreased significantly （p<0.05）;1-6weeks feeding Pediococcus Pentosaceustreatment group lower than in the control group （p<0.05）.Liver biochemistry: For3weeks broiler, TG of the test group were lower than the controlgroup （p>0.05）; CHOL of10⁹cfu （1-6w） and10¹⁰cfu （1-6w） group were significantly lower thancontrol group （p<0.05）; For6weeks broiler, except for1011cfu （4-6w） group, TG of test groupwere significantly lower than those in the control group （p<0.05）; CHOL of the test groupsignificantly lower than the control group （p<0.05）.（4）Antioxidant index: For3weeks broiler, the test group T-SOD has increasing trend （p>0.05）,serum and liver MDA of10¹⁰cfu （1-6w） group was significantly lower compared with the controlgroup （p<0.05）. For6weeks broiler, liver of T-SOD of10⁹cfu （4-6w）,10¹⁰cfu （1-6w） group washigher than that of control group （p<0.05）; leg muscle of T-SOD of10¹⁰cfu （1-6w） group washigher compared with the control group （p<0.05）; breast MDA of10¹⁰cfu （1-6w） group wassignificantly lower than the control group （p<0.05）.The above results show that, Pediococcus pentosaceus with improvement on AA meat qualityof broilers.10¹⁰cfu （1-6w） dose is better than other dose on all of broiler chicken.