Study On Beef Characteristics Datong Yak

Six normal,healthy 18-months-old and adult Datong yaks selected randomly were taken for the reseach The meat performance ,the edible quality ,the nutriet contents,the fatty acid components and the volatile flavor substance in the yaks were detected systematically .After the research and the analysis,the results were shown as below:1. Meat performanceCompared with local yak,Datong yak's meat performance is better.Live weight of Datong yak is142.80kg, flesh weight is73.5kg, carcass length is 89.40cm, really flesh weight is 54.24kg, slagther rate47.91 %,really flesh rate is 37.1%.There are items that are significant highter than local cattles'(P<0.01). There were significant relationships(P<0.05)between live weight,the flesh weight,the really flesh rate and the indicators of body size2. Edible qualityThe color and marble of 18-months-old yak meat are less than those of adult yak meat,and marbe was the significance difference(P<0.05). The 18-months-old yak meat quality contributed to water holding capacity(P<0.05),the cooked meat ratio(P<0.01)higher than those of the adult yak.,and the lose water ratio,the muscle fiber diameter were lower than those of the adult yak, which indicated that the quality of the 18-months-old beef meat was better than adult yak meat's.3. Nutrient contentsNutrient contents of 18-months-old yak meat contributed to water protein content compared as those of adult yak meat more than 0.61%,and the fat content as the adult yak less than 0.96%. Amino acid total quantity(TAA) of calf yak is 80.14g/100g less than adult yak, essential amino acids(EAA) is 39.75g/100g less than adult yak. According to the UN Food and Agriculture Organization(FAO),proposed the content mode of the ideal protein's essential amino acids(EAA),the18-months-old yak meat's Met+Cys,Trp were lower than those of ideal pattern,the content of Lys is higher than the ideal pattern.4. Fatty acid components18-months-old yak's intermuscular saturated fatty acid and Polyunsaturated fatty acid were less than adult yak,there are 9.44%,0.89%. 18-months-old yak's Monounsaturated fatty acid is more than adult yak 15.75%.The p:s of calf yak is 0.63,the p:s of adult yak is0.53.5. Volatile flavor substancesYak meat volatile flavor ingredients are approximately same,the 18-months-old yak meat's total amount less than 7 kinds of those of adult yak,which include alkane 1 kind,alkene 1 kind,mellowly1 kinds,alkone1kind,the aromatic 1 kind,furane 1 kind.