Studies On Blood Characteristics, Meat Quality And The Meat Flavor Of American Strain Rex Rabbits

The research was to provide essential reference values in feeding management, breeding and meat quality of Rex rabbits.twenty healthy about 2.0 kg weight American Strain Rex rabbits of 5 months old(male and female in half),ten Belgian rabbits(male and female in half), both of them were from Yongdeng Shang chuan rong yuan farm in Gansu province. They were butchered together so as to tested and analyze blood physiological and biochemical parameters,slaughter performance,edible quality and the meat flavor. In addition,we study correlations of blood biochemical indexes with slaughter performance and edible quality.The results showed as below:1. Blood physiological parameters: The results showed that PLT, PCT, PDW, MCHC, RDW, MCV of American Strain Rex rabbits were 292.4×109/L,0.22,17.36fL, 379.0g/L,14.36fL,67.99fL; the PLT of males was significantly higher than females (P<0.01),the PCT was higher than females(P<0.05), but the PDW were significantly lower than females (P<0.01), the RDW was lower than females (P<0.05). American Strain Rex rabbits'MCV, GRA% were significantly higher than Belgiam rabbits (P<0.01),but it's MCHC, PLT, PCT were significantly lower than the Belgian rabbit (P<0.01).2. Serum biochemical parameters: American Strain Rex rabbits'AST, GGT, GLU, CR, UA, CHO and K+, Ca2+ were 40.3U/L, 8.6U/L, 7.036mmol/L, 110.1umol/L, 18.1umol/L,1.406mmol/L and 6.687mmol/L, 3.405mmol/L, GLU, CR, K+ of males was significantly lower than females (P<0.01), ALT, AST, UA, Ca2+ was lower than females (P<0.05). American Strain Rex rabbits'CHO, LDL, Ca2+ was significantly lower than the Belgian rabbit (P<0.01), AST, GGT, HDL was lower than the Belgian rabbit (P<0.05).3. Slaughter performance: Live weight, carcass weight, dressing percentage, meat weight of American Strain Rex rabbits were 1.99kg, 1.07kg, 53.55%, 0.84kg,; males'carcass weight, dressing percentage, meat weight was lower than females (P<0.05). American Strain Rex rabbits'carcass weight, dressing percentage, meat weight, meat bone rate were significantly lower than Belgiam rabbits (P<0.01), live weight, bone weight was lower than the Belgian rabbits (P<0.05).4. Edible quality: pH1 and pH24,L1,A1,B1 and L24,A24,B24,water holding capacity, dripping loss, shearing force, cooking percentage, diameter of muscle fiber in muscle tissues of American Strain Rex rabbits were 6.74 and 6.23, 49.90,11.69,10.19 and 46.54,14.12,12.87,82.13%, 2.36%, 2.675kg·f, 66.77%, 5.005μm. Shearing force and the diameter of muscle fiber of males was higher than females (P<0.05), but the water holding capacity was lower than females (P<0.05).American Strain Rex rabbits'shearing force, diameter of muscle fiber were significantly higher than Belgian rabbits (P<0.01), water holding capacity was lower than Belgian rabbits (P<0.05).5. Correlation between American Strain Rex rabbits Serum biochemical parameters and slaughter performance and edible qualityAmerican Strain Rex rabbits Serum biochemical parameters existed strong correlation with a great number of slaughter performance and edible quality.There was very significant positive correlation between live weight, carcass weight and HBDH(P<0.01),there were significant positive correlation between Slaughter rate and GLU, CR, Ca2+(P<0.05), meat weight was significant positive correlation with TBIL, DBIL, AST, GLU, CR, HBDH, K+(P<0.05).pH24 was very significant positive correlation with DBIL,AST and was significant positive correlation with ALB, GLU, HBDH, K+; Cooking percentage was significant negative correlation with CHO, HDL, LDL.6. Meat flavorSensory evaluation showed that American Strain Rex rabbits meat flavor heavier than Belgian rabbits. male and female American Strain Rex rabbits had same meat flavor,but abdominal meat flavor were the heaviest,followed by the legs, buttocks, back muscles. LOX activity of American Strain Rex rabbits was 0.605△A·min^-1·g^-1, abdomen, leg, buttock and back muscle were 0.643△A·min^-1·g^-1, 0.627△A·min^-1·g^-1, 0.595△A·min^-1·g^-1, 0.554△A·min^-1·g^-1.LOX activity of male rabbits abdomen and leg muscle was higher than females (P<0.05), while the back and buttock muscle had no differences (P>0.05).American Strain Rex rabbits buttocks muscle LOX activity was were significantly higher than Belgian rabbits (P<0.01), abdomen,leg and back muscle were were higher than Belgian rabbits (P<0.05).The electrophoresis of LOX isoenzymes showed that American Strain Rex rabbits different gender had same bands,different muscle sites had different degrees of light and dark bands and abdomen muscle band was the lightest, American Strain Rex rabbits bands width than Belgian rabbits.