A Study On Beef Characteristics Of Tianzhu White Yak Meat

After 6 months of being fatten with the same feed,6 Tianzhu white yaks and 3 local cattles whose age are 3 or 4 were slaughtered.By advanced array apparatus,example for amino acid automatic analyzer,atomic absorption spectrophotometer,SPEM,GC-MS and so on,Yield performances,Palatability, nutrious compounds and fatty acid as well as volatile flavor substances are measured and analyzed. The results were showed that:(1) Meat performanceCompared with local cattle, white yak's meat performance is worse.Live weight of white yak is 252.40kg,flesh weight is 128.60kg,really flesh weight is 99.00kg,slagther rate is 49.17%,really flesh rate is 38.25%.There are items that are significant lower than local cattles'(P<0.05).There were significant relationships (P<0.05) between eye-flesh area and slagther rate and really flesh rate.(2) Edible qualityCompared with local cattle, there have no sinificant difference in WHC(54.63%), pH24(5.35) value and marbling score(3.00). But in meat colour(4.50),pH1 value(6.80),shear value(4.19kg/cm2),the diameter of muscle fibre(46.75μm),there have significant or best significant(P<0.05 or P<0.01 ) difference.(3) Nutrious compoundsCompared with contrasts, white yak's nutritious quality is better. It has the charac-teristics with higher protein(21.85%,P<0.05), lower fat(2.23%,P<0.05) and higher ash(1.16%,P<0.01) as well as abundant mineral materials, especially iron (6.60 mg/100g,P<0.01). Total amino acids are higher (19.868g /100g). Essential amino acid content was 7.620g/100g. The rate of essential amino acids content and total amino acids content was per 38.35. MET+CYS and TRP were limiting amino acids.(4) Fatty acidMainly fatty acid in muscle and fat tissues of white yak are higher than 95%.PUFA content (6.76%,2.19%) obviously to be higher than the local cattle.P: S proportion about 0.1 ,0.04 respectly, are lower than the nutritional value standard (P: S value 0.4).(5) Volatile flavor substancesThe flavor volatiles in mutton were analyzed with SPME and GC-MS.Sixty two...