A planing of useful methods for improvemant of meat quality on Holstein stee

1.对A、B两个养殖场的育肥体系进行了调查，包括育肥舍结构、育肥方案、饲料组成、育肥环境因素等。B组育肥肉牛的肉质评分高于A组，差异的原因是B场对肉牛育肥的精心管理。对A、B育肥荷斯坦肉牛肉质评定项目间的相关性进行了分析，计算了卡方、古德曼-库鲁斯卡尔伽玛、萨默斯d和Kendall‘s tau统计量等关联度，得出A育肥肉牛肉质评定项目之间存在一定的相关性，许多育肥方案和方案对改良A育肥肉牛肉质是必要的。B Will…肉品质的研究更多的通过改善的方式提高的因素之一。这一分析对制定肥育方案、提高肉质等级具有一定的参考价值。我测定了胸背最长肌脂肪的脂肪酸组成。为了分析脂肪酸对肉质等级的影响，以脂肪酸比例作为判别项，进行了逐步线性判别分析。肉质分级分为3级以上和3级以下两组，正确率分别为78%和61%。脂肪酸组成与肉质评价之间存在一定的相关性。测定了53头14和16月龄育肥公牛(屠宰前6个月和4个月)血清总脂的脂肪酸组成。将屠体肉质分级分为两组。判别分析如上所述。两组都有超过75%的正确率。这些结果表明，通过测定血清中总脂肪的脂肪酸组成来评价肉类品质是可行的。我认为生产荷斯坦肉牛的高效育肥方法具有更高的肉质。较少

1. I investigated some fattening systems of two farms (A and B) which were the structure of feeding houses for fattening, program of fattening, composition of feeds, environmental factors for fattening and others. The evaluation of meat quality on beef carcass grading of beef cattle fattened by B was higher than those of A.The cause for this difference was the elaborate management for beef cattle fattening of B farm.2. I analyzed the association between items for the evaluation of meat quality on carcass grading of Holstein steers fattened by A and B.I calculated some association measures that were chi square values, Goodman-Kuruskal's gamma, Somers's d and Kendall's tau statistics.T here were a few associations between items for meat quality evaluation of cattles fattened by A.Many fattening programs and plans were necessary for improvement of meat quality of beef cattle fattened by A.On the other hand, B had associations between marbling, texture and firmness. Meat quality of B will … More rise by means of improvement one of the factors. This analysis was useful for planing of fattening programs to improve meat quality grade.3. I determined fatty acid compositions of lipid in M.longissimus thoracis. In order to analyze the influencing fatty acids on meat quality grade, I carried out the stepwise linear discriminant analysis by applying fatty acid proportions as discriminant items. Meat quality grades were classified two groups of over 3 and under 3. The percent correct were 78% and 61% individually. There was an association between fatty acid composition and meat quality evaluation.4. I determined fatty acid compositions of total lipid in blood serum collected from 53 fattening steers at 14 and 16 months old (6 and 4 months before slaughter) . Meat quality grade of carcass were classified two groups. The discriminant analysis was carried out as stated above. Both groups had over 75% of the percent correct. These results suggested a possibility of meat quality estimation by means of determination of fatty acid composition of total lipid in blood serum.5. I considered efficient fattening methods on production of Holstein steer having higher meat quality. Less