The Changes with Passage of Time in Ultrasonic Estimates of Carcass Traits of Japanese Black Bulls
The Changes with Passage of Time in Ultrasonic Estimates of Carcass Traits of Japanese Black Bulls
复制标题
日本黑牛胴体性状超声评价随时间的变化
DOI：
10.2508/chikusan.60.185
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
R. Fukuhara
中科院分区：
文献类型：
--
作者：
H. Harada;K. Moriya;R. Fukuhara
从试验结束到80月龄，每隔约10个月对性能测试的日本黑牛进行超声扫描，以澄清胴体性状随时间推移的变化，如脂肪厚度、M.胸最长肌面积和第7和第8肋骨之间的大理石花纹评分。本研究通过使用14-16月龄（第一阶段）扫描的屠体性状估计值和在性能测试结束时获得的体尺测量值，讨论了预测20月龄（第二阶段）和40月龄（第三阶段）屠体性状的可能性。在实验期间，大多数公牛的脂肪厚度估计为13至18毫米。M.胸最长肌面积估计值与Logistic生长曲线拟合良好，并在50月龄时增加到估计的成熟大小（46.5- 53.1cm 2）。一个很大的变化被发现之间的公牛在增长模式的大理石花纹得分。一些公牛在早期（20）月龄时表现出高水平的肌内脂肪沉积。在大多数公牛中，这一性状在50月龄时根据Logistic函数增加到预期的成熟水平（2.0-3.9）。多元回归分析表明，利用超声波估计第一阶段的屠体性状和体尺可以预测第二阶段和第三阶段的屠体性状，脂肪厚度的贡献率分别为78.6%和73.1%，M的贡献率分别为90.1%和81.1%。大理石纹评分分别为72.9%和53.9%。JPN. J. Zootech科学，60（2）：185-191，1989年
Performance tested Japanese Black bulls were ultrasonically scanned from the end of testing to 80 months of age at intervals of about 10 months to clarify the changes with passage of time in carcass traits such as fat thickness, M. longissimus thoracis area and marbling score between the 7th and 8th ribs. The possibility of prediction of the carcass traits at 20 months (Stage II) and 40 months (Stage III) of age was discussed in this study by using the scanned carcass trait estimates at 14-16 months of age (Stage I) and body measurements obtained at the end of performance testing. Fat thickness estimates ranged from 13 to 18mm in most bulls through the experimental period. The changes in M. longissimus thoracis area estimates were well fitted to the Logistic growth curve and increased to the estimated mature size (46.5-53.1cm2) on 50 months of age following the function. A large variation was found among bulls in the growth pattern of their marbling score. Some bulls showed a high level of intramuscular fat deposition at early (20) months of age. In most of bulls this trait increased to the expected mature level (2.0-3.9) on 50 months of age following the Logistic function. Multiple regression analyses suggested that carcass traits at Stage II and III can be predicted by use of ultrasonic estimates of carcass traits and body measurements at Stage I with contribution rates of 78.6 and 73.1% for fat thickness, 90.1 and 81.1 % for M. longissimus thoracis area and 72.9 and 53.9% for marbling score, respectively. Jpn. J. Zootech. Sci.,60 (2): 185-191, 1989