阿佐玲奈，岡本匡代，佐々木可奈恵，大井幹記，竹尾麻紗美，萩
谷功一，口田圭吾．2017．黒毛和種の脂肪交雑形状および消
費者型官能評価との関係性．日本畜産学会報 88，139-143．
日畜会報 91（2）：103-110, 2020
109
後藤・阿佐・萩谷・口田
A new evaluation method of marbling fineness in M. longissimus
thoracic of Japanese Black Cattle
Yako GOTO1, Reina ASA1, Koichi HAGIYA1 and Keigo KUCHIDA1
Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan
Corresponding : Keigo KUCHIDA (fax : ＋81 (0) 155-49-5462, e-mail : kuchida@obihiro.ac.jp)
In recent years, marbling fineness has been attracted attention for the evaluation of meat quality of
Japanese Black cattle, and it must be converted into the numerical value. Therefore, we examined
several image analysis methods for objective evaluation of marbling fineness, and estimated its genetic
parameters. Thirty Japanese Black cattle, various shape of the rib eye area and of marbling, were used
in this study. The carcass images were captured from the 6-7th rib cross section. To determine visual
evaluation values of marbling based on the fineness, five skilled panelists allocated for the carcass
assessment. Six different calculations, the sum of circumferential lengths of marbling particles which
were obtained by image analysis, for the new evaluation methods of marbling fineness were examined,
and correlation analysis with visual evaluation values were conducted. Data for genetic analysis were
collected from the Japanese Black cattle (n = 25,432) listed on the carcass market in Hokkaido between
September 2005 and July 2018. The range of rib eye area and beef marbling standard (BMS) for the
thirty selected rib eyes were 55 to 121 cm2 and 10 to 12, respectively. The correlation coefficient between the visual evaluation values and the values obtained by dividing the sum of circumferential
lengths of marbling particles by the area of the rib eye area (NFI-2) was the strongest correlation
(−0.81). The heritability of NFI-2 was 0.55, which indicated that the trait for which genetic improvement
might be sufficiently possible.
Nihon Chikusan Gakkaiho 91 (2), 103-110, 2020
Key words : genetic parameter, image analysis, Japanese Black cattle, marbling fineness.
日畜会報 91（2）：103-110, 2020
110
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