@techreport{oai:miyazaki-u.repo.nii.ac.jp:00004775,
 author = {原田, 宏},
 month = {2020-06-21},
 note = {In beef cattle, it takes a long period of time to get proved sires on meat quality and quantity by the performance and progeny testing. In order to solve the problem, seriatim changes of carcass traits between the 7th and 8th ribs of Japanese Black bulls has been studied by use of ultrasonics. Then the regression equation for predicting fat thickness, M. long. thoracis area and marbling score of sires were estimated at early stages of know if they applied to selecting superior bulls.
1. Fat thickness was in the region of 13 to 18 mm in most bulls and stages of age. M. long. thoracis area were growing to the ninety percentage (41.9-47.8 cm^2) of mature estimate on twenty nine months of age, and to the mature estimate (46.5-53.1 cm^2) on fifty months of age by using the ordinary Logistic function. Marbling score was increasing to the ninty percentage (+1.8~+3.5) of mature estimate on thirty months of age, and to the mature estimate (+2.0~+3.9) on fifty months of age by fitting the ordinary Logistic function.
2. Fat thickness, M. long. thoracis area and marbling score on twenty or fourty months of age allowed prediction with 78.6 or 73.1%, 90.l or 81.1% and 72.9 or 53.9% of ratios of contribution fifty months of age by using the multiple regression equation., この研究は「伊藤記念財団」の助成を受けて行われました。},
 title = {黒毛和種雄牛の屠肉形質の経時的変化},
 year = {},
 yomi = {ハラダ, ヒロシ}
}