Study On The Effect Of Feeding Models On Meat Quality Trait Of Quality Chicken

The effect of three feeding models, i.e. net, floor, free range, on the meat performanceand muscle quality of Gushi chicken were studied. The body weight, body measurements,slaughter performance, muscle quality and blood biochemical parameters were measuredfor cocks at 13-week-old and hens at 16-week-old. The breast component, fatty acidcomponent, thiamine content, IMP content, muscle fibrin diameter and density weremeasured for hens. The chickens were fed in floor model for the first five weeks, then theywere weighed, sampled and divided into three groups, fed ad libum in three feeding modelsrespectively. The results were as follows:(1) There was no significant difference in body weights of 13-week-old cocks amongthree feeding models,but there was significant difference in body lean length, metatarsuslength, metatarsus color, comb height, comb color, leg muscle rate, stomach rate, abdomenfat rate, comb rate, and spermary rate; and significant difference in body weight, metatarsusgirth, metatarsus color, semi-eviscerated rate, abdomen fat rate, stomach rate of16-week-old hens among three models(P＜0.05). In general, the body weight of cock in netmodel was the highest, the lowest in floor model. For 6-to-11-week-old hens, the highestbody weight was obtained in net model, then came to the floor and free range models. After12 weeks that of the group in floor model was the highest, and the lowest in the freerange model.(2)There was no significant difference in breast muscle fat content among three models.The fatty acid content of the chicken from the hightest to the lowest was in turn in oleicacid, palmitate, linolic acid, stearic acid. Necessary fatty acid content of muscle in netmodel was the highest, and in free range model was the lowest. Thiamine content of hen breast muscle in free range model was higher than that in net model, and that in floor modelwas in the middle of them. IMP content of hen breast muscle was the highest. The fibrindiameter of hen breast muscle in free range model was significantly higher than that in netmodel, and that in floor model was in the middle of them. There was no significantdifference in fibrin density of hen breast muscle, fibrin density and diameter of hen thighmuscle among three models.(3)There was no significant difference in shank strength of 13-week-old cock amongthree models (P＞0.05), but shank strength of 16-week-old hen in free range model wassignificantly lower compared with those in the other models (P＜0.05), and there was nosignificant differences in Ca and P contents of t3-week-old cock and 16-week-old henamong three models (P＞0.05).(4)Content of MCH in 13-week-old cock in net model was lower than in the othermodels (P＜0.05), and there was no significant differences in Ca, P, TG, T-CHOL, GLUcontent and enzyme activity of blood (P＞0.05). For 16-week-old hen, Content of MCHCand MCH in free range model were lower than in floor model (P＜0.05), and content ofMCV in free range model was higher than in floor model (P＜0.05). T-CHOL content in freerange model was lower than in the others (P＜0.05).There was no significant difference inCa, P, TG and GLU contents (P＞0.05); HBDH activity in net model was higher than infloor model; ALP activity in free range model was higher than in the others (P＜0.05), LPAactivity in free range model was lower than in the others (P＜0.05).