論文 - 徳永 忠昭
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Handheld Pig-Weight Estimation Using an RGB-D Sensor 査読あり
Win K.D., Kawasue K., Tokunaga T., Iki Y.
Lecture Notes in Electrical Engineering 1322 LNEE 95 - 103 2025年2月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Lecture Notes in Electrical Engineering
Although mechanical weighing machines specialized for pigs are normally used to measure animal weights on pig farms, guiding those animals onto the weighing machines is a difficult and unpleasant chore that normally takes 20 seconds to complete after the pig is positioned on the load cell. Additionally, pig weighing machines are prone to mechanical breakdowns and are unpleasant to repair because of the farm residue they collect. Therefore, the development of a more practical and robust weight measurement apparatus is desired. In the present paper, we report on a handheld weight estimation device using a red-green-blue-depth (RGB-D) sensor with a laser slit system. An RGB-D sensor system is used to estimate pig weights, and the laser slit is used to align the measurement direction of the RGB-D sensor along the pig’s body. In operation, this system captures a depth image of the pig under examination and then uses it to create three-dimensional (3D) data. The 3D body parameters are extracted using image processing, and those extracted 3D body parameters for the pig are then fed into a random forest algorithm to produce the weight estimation. We also report on experimental results that demonstrate the reliability of our pig weight estimation system and its suitability for practical use.
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Robust pig extraction using ground base depth images for automatic weight estimation 査読あり
Win K.D., Kawasue K., Tokunaga T.
Artificial Life and Robotics 30 ( 1 ) 42 - 50 2025年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
Dark colored pigs (Berkshire, Duroc, etc.) are widely recognized nationwide in Japan for their exceptional taste, with the southern Kyushu region being a renowned production area for these esteemed breeds. However, estimating the weight of these pigs using a camera presents a unique challenge. The key process in a camera-based weight estimation system is the precise extraction of the target pig from the background. Typically, cameras capture images from above, as the top-view images provide the most specific growth indicators. However, the image from above contains a ground image. Since Berkshire and Duroc pigs are black and red, respectively, they blend into the ground, making it difficult to accurately segment the pigs in the images. Thus, it is crucial to perfectly distinguish between the ground and the pigs. Therefore, a new extraction method is proposed to distinguish between the ground and pigs by converting depth data based on the pig's position. To enhance the efficiency of pig farming and alleviate the burden on workers, our goal is to develop a system that automatically measures the weight of Berkshire pigs for shipment without background interference. In this study, we installed the system at a Berkshire pig farm and demonstrated the effectiveness of this innovative extraction method for camera-based weight estimation.
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The efficacy of crossbreeding on reproductive and productive performance in New Zealand White and Flemish Giant rabbits 査読あり 国際共著
Lydia Masara, Fortune Jomane, Sizo Moyo, Jessica Pullen, Reagan Mudziwapasi, Chiedza Mgumba, Samkeliso Moyo, Tadaaki Tokunaga, Alban Mugoti
Bulgarian Journal of Animal Husbandry 61 ( 5 ) 18 - 24 2024年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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地域飼料資源を主体とした発酵TMR給与による黒毛和種経産老廃牛の肥育試験
松浦千聖，大野篤太，山野勇朔，徳永忠昭，田尻優生，木村 萌，高橋俊浩，小林郁雄，川島知之
肉用牛研究会報 ( 114 ) 5 - 13 2023年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Metabolic Profils and Their Correlation with Carcass Traits in Japanese Black Steers under Progeny Testing 査読あり 国際共著
Tadaaki TOKUNAGA, Fortune Ntengwa JOMANE, Toshihiro TAKAHASHI, Hiromu KATAMOTO, Ikuo KOBAYASHI, Kenichi YOSHIMUTA, Ryuji OKUNO and Takafumi ISGIDA
日本暖畜産学会報 64 ( 2 ) 89 - 95 2021年9月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Diversity of the Tellurite Resistance Gene Operon in <i>Escherichia coli</i>. 査読あり
Nguyen TTH, Kikuchi T, Tokunaga T, Iyoda S, Iguchi A
Frontiers in microbiology 12 681175 2021年5月
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Tokunaga T., Jomane F.N., Mandai S., Ishida T., Hirooka H.
Animal science journal = Nihon chikusan Gakkaiho 92 ( 1 ) e13533 2021年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Animal science journal = Nihon chikusan Gakkaiho
The objective of this study was to develop mathematical equations for describing the change in marbling in Japanese Black steers using longitudinal measurements. Serial ultrasound measurements were taken at 14, 16, 20, and 26 months of age and analyzed using an image analysis software. The longitudinal marbling measurements from the ultrasound images and carcasses were fitted into a nonlinear logistic curve. Data used for the analysis consisted of 749 steers that converged in nonlinear curve fitting and showed reasonable estimated parameters of the logistic curves. The average predicted mature beef marbling score (BMS) and maturation rate were 6.26 and 0.353, respectively, and the average maturity levels at 24 months of age were 83.9%. The heritability estimates for the predicted maturity traits were moderate, indicating that these traits may have potential for genetic improvement. There was a negative relationship between the expected progeny differences between carcass BMS and maturity traits, suggesting that genetic improvement by carcass BMS may lead to the selection of bulls with late maturity for marbling. The results indicate that ultrasound and model building for marbling can be useful tools to correctly select candidate bulls with high marbling in the early fattening period.
DOI： 10.1111/asj.13533
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Crowing characteristics of native singing chicken breeds in Indonesia 査読あり
Bugiwati S.R.A., Dagong M.I.A., Tokunaga T.
IOP Conference Series: Earth and Environmental Science 492 ( 1 ) 2020年6月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP Conference Series: Earth and Environmental Science
© Published under licence by IOP Publishing Ltd. Singing chicken is germplasm, genetic resources, indigenous chicken in Indonesia and be known of their unique, exclusive, superiority of singing style with long-melodious rhythm, and different crowing style-tone-tempo comparing with other singing chickens breeds in the world. Some crowing character information was needed to optimize conservation and utilization strategies. The aim of the study was to compare crowing duration and number crowing syllables four singing chicken breeds in Indonesia (Bekisar, Kokok Balenggek, Pelung and Gaga'). This research used 532 birds Gaga' chicken from Sidrap, Barru and Maros Districts, South-Sulawesi province, Indonesia. They were separated based on crowing speed into Slow-group (234 birds) and Dangdut-group (298 birds). Then, Dangdut-group has separated again, based on total number crowing syllables, into Long-Dangdut-type (51 birds) and Short-Dangdut-type (247 birds). All crowing sounds were recorded and computerizing digitalized using Cool Edit Pro. Software to visualized bioacoustic character as a wave form then data interpreting for analyzing mean and standard deviation. Average crowing durations of Pelung, Kokok Balenggek, Bekisar and Gaga' chicken (Short-Dangdut-type and Slow-group) were 2.0 to 10.0 sec. Dangdut-Long-type was the longest crowing duration (30.5 sec) and the highest number syllables (140.92). Average number syllables of Pelung (3 sec), Kokok Balenggek (3 to 12 sec) and Bekisar (2 sec) chicken were less than Gaga' chicken (Dangdut-Long-type: 140.9 sec, Dangdut-Short-type: 20.9 sec and Slow group: 8.2 sec). Each singing chicken breed in Indonesia have uniqueness and differences crowing character. A crowing character such as crowing duration and number of syllable could be identified as one of basic selection to promote and to maintain conservation of singing chicken as germplasm of Indonesia.
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Nakanishi T., Tokunaga T., Ishida T., Kobayashi I., Katahama Y., Yano A., Erickson L. and Kawahara S.
Asian-Australasian Journal of Animal Sciences 32 ( 4 ) 592 - 598 2019年4月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Asian-Australasian Journal of Animal Sciences
Copyright © 2019 by Asian-Australasian Journal of Animal Sciences. Objective: Autophagy is a bulk degradation system for intracellular proteins which contributes to skeletal muscle homeostasis, according to previous studies in humans and rodents. However, there is a lack of information on the physiological role of autophagy in the skeletal muscle of meat animals. This study was planned as a pilot study to investigate changes in expression of two major autophagy-related genes, microtubule-associated protein 1 light chain 3β (MAP1LC3B) and autophagy related 7 (ATG7) in fattening beef cattle, and to compare them with skeletal muscle growth. Methods: Six castrated Japanese Black cattle (initial body weight: 503±20 kg) were enrolled in this study and fattened for 7 months. Three skeletal muscles, M. longissimus, M. gluteus medius, and M. semimembranosus, were collected by needle biopsy three times during the observation period, and mRNA levels of MAP1LC3B and ATG7 were determined by quantitative reverse-transcription polymerase chain reaction. The expression levels of genes associated with the ubiquitin-proteasome system, another proteolytic mechanism, were also analyzed for comparison with autophagy-related genes. In addition, ultrasonic scanning was repeatedly performed to measure M. longissimus area as an index of muscle growth. Results: Our results showed that both MAP1LC3B and ATG7 expression increased over the observation period in all three skeletal muscles. Interestingly, the increase in expression of these two genes in M. longissimus was highly correlated with ultrasonic M. longissimus area and body weight. On the other hand, the expression of genes associated with the ubiquitin-proteasome system was unchanged during the same period. Conclusion: These findings suggest that autophagy plays an important role in the growth of skeletal muscle of fattening beef cattle and imply that autophagic activity affects meat productivity.
DOI： 10.5713/ajas.18.0370
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Polymorphisms of RDH16 and VEGFR1 influence M. trapezius steatosis in Japanese Black carcass 査読あり
Ishida T., Noda K., Jomane F., Tokunaga T.
Animal Science Journal 88 ( 8 ) 1037 - 1041 2017年8月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Animal Science Journal
© 2016 Japanese Society of Animal Science The exact cause of steatosis, one of defects in Japanese beef carcasses, has not been elucidated to date, because it is very difficult to diagnose cyclopedically with certain reproducibility due to the bias in the outbreak. Therefore, the objective of this study was to assess the influence of polymorphisms in retinol dehydrogenase 16 (RDH16), myoferlin (MYOF) and vascular endothelial growth factor receptors 1 and 2 (VEGFR1, VEGFR2) on carcass-graded Musculus trapezius steatosis. For logistic regression analysis, 646 carcasses shipped from 29 farms in Miyazaki, Japan, were used. The GG genotype in RDH16 showed significant odds ratios against AA and AG. In VEGFR1, CT had a significant odds ratio against CC. After evaluating for interaction, highly significant odds ratios were observed in the combinations that included the GG risk genotype in RDH16. It is noteworthy that there was no steatosis in the combination GG (RDH16) and CC (VEGFR1). It may be concluded that there is a possibility that steatosis can be suppressed by the CC genotype in VEGFR1. The current study revealed the influence of genetic polymorphisms on M. trapezius steatosis that had not been reported until now, and may help elucidate the cause of steatosis.
DOI： 10.1111/asj.12746
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Black cattle body shape and temperature measurement using thermography and KINECT sensor 査読あり
Kawasue K., Win K., Yoshida K., Tokunaga T.
Artificial Life and Robotics 22 ( 4 ) 464 - 470 2017年6月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Artificial Life and Robotics
© 2017, ISAROB. Black cattle body shape and temperature measurement system is introduced. It is important to evaluate the quality of Japanese black cattle periodically during their growth process. Not only the weight and size of cattle, but also the posture, shape, and temperature need to be tracked as primary evaluation criteria. In the present study, KINECT sensor and thermal camera obtains the body shape and its temperature. The whole system is calibrated to operate in a common coordinate system. Point cloud data are obtained from different angles and reconstructed in a computer. The thermal data are captured too. Both point cloud data and thermal information are combined by considering the orientation of the cow. The collected information is used to evaluate and estimate cattle conditions.
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Jomane,F., Ishida,T., Tokunaga,T., Morita,T.
Animal Science Journal 88 ( 3 ) 413 - 420 2017年3月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Animal Science Journal
© 2016 Japanese Society of Animal SciencePolymorphisms in genes involved in lipid metabolism have been reported to be associated with fatty acid composition of adipose tissue. However, the relationship of these polymorphisms with premortem ultrasonic traits is unknown. The objective of this study, therefore, was to assess the association between polymorphisms in fatty acid synthase, stearoyl-coenzyme A desaturase (SCD), sterol regulatory element-binding protein 1 (SREBP1), diacylglycerol acyltransferase 1, and nuclear receptor subfamily 1, group H, number 3 genes with ultrasonic and carcass traits in Japanese Black steers (n = 300) under progeny testing at the Livestock Improvement Association of Miyazaki. To have a comprehensive analysis of the association between the aforementioned genetic polymorphisms and ultrasonic traits, longitudinal measurements of ultrasonic traits were taken. Furthermore, the association of these genetic polymorphisms and carcass traits was evaluated. The polymorphisms in the SCD gene and SREBP1 were associated (P < 0.05) with some ultrasonic traits at multiple stages. To add to that, the polymorphisms were associated (P < 0.05) with some carcass traits. These findings suggest that the polymorphisms in SCD and SREBP1 are functional mutations or could be related to mutations that can aid in selection to improve some ultrasonic and carcass traits.
DOI： 10.1111/asj.12650
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繁殖雌牛の父方系統および近交係数が産肉形質に与える影響 査読あり
尼子真愉,Jomane Fortune Ntengwa,石田孝史,原田 宏,徳永忠昭
日本動物超音波技術研究会報 ( 4 ) 3 - 12 2016年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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超音波診断装置を用いたバークシャー種育成豚の産肉形質改良に関する基礎的研究 査読あり
野間本静佳,Jomane Fortune Ntengwa,石田孝史,原田 宏,徳永忠昭
日本動物超音波技術研究会報 ( 4 ) 13 - 18 2016年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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Growth pattern of young progeny test steers and relationship between the carcass measurements in Japanese Black (Wagyu) 査読あり
Kodama,Y., Jomane,F., Okuhata,K., Totsu,T., Ishida,T., TokunagaT.
The 17th AAAP Animal Science Congress 928 - 931 2016年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Sasaki, Y., Furusho, K., Ushijima, R., Tokunaga, T., Uemura, R., Sueyoshi, M.
Japan Agricultural Research Quarterly 50 ( 4 ) 361 - 368 2016年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Japan Agricultural Research Quarterly
The aim of this study was to quantify the body surface temperature of suckling piglets, and determine the association between body surface temperature, body weight and growth rate during the suckling period. The study population consisted of 72 piglets from six sows that were randomly selected at day 4 after farrowing. Infrared thermography and weighing were performed every other day from day 4 to 24 of lactation. Thermal images of each piglet were taken at the eye, base of ear, back, and anus using a handheld infrared camera. Body surface temperature was associated with piglet age and growth rate (P < 0.05), but not with body weight. At day 14, the body surface temperature was highest in all regions (P < 0.05), while at day 24 the piglets averaged lower body surface temperatures than at days 4-18 (P < 0.05). The interaction between piglet age and growth rate significantly affected body surface temperature (P < 0.05). The body surface temperature only varied with growth rate in piglets 12 and 14 days old after birth (P < 0.05). In conclusion, infrared thermography might be useful for the detection of body surface temperature that can be used as an indication of growth performance in piglets with health problems.
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Genetic Polymorphisms and Their Association with Growth and Carcass Traits in Japanese Black Steers under Progeny Testing 査読あり
Fortune Ntengwa JOMANE, Takafumi ISHIDA, Kensuke MORIMOTO, Natuki FUJISHITA, Tadaaki TOKUNAGA, Hiroshi HARADA and Tetsuo MORITA
日本暖地畜産学会報 58 ( 2 ) 217 - 224 2015年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Genetic Polymorphisms and Their Associations with Growth and Carcass Traits in Japanese Black Steers 査読あり
F. N. Jomane, T. Ishida, K. Morimoto, T. Tokunaga and H. Harada
The 16thAAAP Animal Science Congress 2 33 - 36 2014年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Estimation of Carcass Yield Percentage Using Ultrasound and Body Measurements in Japanese Black Cattle 査読あり
T. Tokunaga, F. N. Jomane, T. Ishida and H. Harada
The 16th AAAP Animal Science Congress 2 2275 - 2278 2014年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Feasibility of using the ultrasound technique in the genetic improvement of young Japanese Black bulls 査読あり
Fortune Ntengwa Jomane, Tadaaki Tokunaga, Takafumi Ishida, Hiroshi Harada
日本暖地畜産学会会報 57 ( 2 ) 123 - 130 2014年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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An assessment of reproductive and lifetime performances of Kagoshima Berkshire gilts and sows
Sasaki Y., Tokunaga T., Uemura R., Sueyoshi M., Sueyoshi M.
Animal Science Journal 85 ( 3 ) 213 - 218 2014年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Animal Science Journal
We investigated the reproductive and lifetime performances of Kagoshima Berkshire gilts and sows. We examined 20605 parity records of 4419 pigs for 2008 to 2012 on a farrow-to-finish commercial farm. The mean parity (±SD) of all animals was 3.0±2.1. For farrowing performance, the highest numbers of total pigs born and pigs born alive were found in sows with parities 5 and 6 and with parity 3-6, respectively (P<0.05). Regarding weaning and mating performance, sows with parity 2 had the lowest preweaning mortality (P<0.05). The longest weaning-to-first-mating interval was found in parity 1 pigs, and the interval decreased as parity increased (P<0.05). Parities 0 and 1 pigs had the lowest farrowing rate and those with parity 4 had the highest farrowing rate (P<0.05). The mean parity at culling, total number of pigs born alive in a lifetime, and nonproductive days in a lifetime were 5.5±2.93, 49.2±24.72 pigs, and 132.1±83.34 days, respectively. These animals had a lower litter size and fertility that the F1 crossbred sows mainly used in Japan, but a similar tendency for performance by parity. © 2013 Japanese Society of Animal Science.
DOI： 10.1111/asj.12140
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ロジスティック回帰分析による黒毛和種枝肉における瑕疵発生に及ぼす環境および遺伝的要因の解析 査読あり
石田 孝史, 徳永 忠昭, 有馬 慎吾, 森田 哲夫, 高橋 俊浩, 入江 正和
日本畜産学会報 84 ( 4 ) 435 - 442 2013年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Japanese Society of Animal Science
牛枝肉における瑕疵発生要因の基礎的知見を得るため，黒毛和種の枝肉格付記録（宮崎県内2002年～2008年，<I>n</I>＝70,171）を用い，シミ，カツジョ，ズル，シコリ，アタリに及ぼす性，格付年度，格付月，屠前体重区分，肥育農家，父牛の影響をロジスティック回帰分析により調査した．その結果，シミとカツジョはズル，シコリ，アタリと比べ発生頻度が低く，ズルは格付年度をおって低下傾向にあった．シミでは去勢が雌の6.27倍の発生リスクがあった（<I>P</I>＜0.001）．シコリとアタリの発生には父牛の影響がみられた（<I>P</I>＜0.001）一方で，シミ，カツジョ，ズルは父牛が影響を及ぼしていない可能性が示唆された．シコリは，屠前体重の軽い個体に発生しやすく，発生頻度は農家によって大きく異なった．以上から，特にシコリは遺伝的要因に起因する個体ごとの感受性の差異に，飼養管理を含む環境要因が作用して発生する可能性が示唆された．
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Three-dimensional shape measurement system for black cattle using KINECT sensor
Kawasue K., Ikeda T., Tokunaga T., Harada H.
International Journal of Circuits, Systems and Signal Processing 7 ( 4 ) 222 - 230 2013年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Circuits, Systems and Signal Processing
In the present paper, a measurement system for cattle using a computer vision technique is introduced. It is important to evaluate the quality of Japanese black cattle periodically during the growth process. Not only the weight and size of cattle, but also the posture and shape, are checked as the primary evaluation criteria. In the present study, the digital point cloud data of cattle are obtained by three-dimensional computer vision devices from different angles simultaneously. These devices are calibrated in advance to have a common coordinate system. The point cloud data obtained from different angles is reconstructed on a common coordinate system, and digital cattle are generated in the computer considering the orientation of the cow. The important specifications for evaluating the cow posture are estimated from the reconstructed cattle on the computer.
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徳永 忠昭, 石田 孝史, 高見 哲也, 大山 敏, 原田 宏, 森田 哲夫
肉用牛研究会報 94 9 - 15 2013年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：肉用牛研究会
本研究では,超音波診断装置を用いて黒毛和種肥育牛生体で経時的に枝肉構成の計測を行い,超音波測定値と実際の屠体実測値間の関連性を調査(896頭)し,その発育様相を推定し早期出荷の可能性について検討した。屠体実測値と超音波測定値との関連性は,出荷2カ月齢前における同形質問で中程度から高い相関が得られ,生体時において枝肉構成を把握できることが示唆された。また,枝肉を構成する各形質の発育様相が明らかとなり,各筋肉および脂肪で発育パターンが異なることが示唆され,体重およびロース芯面積のみを考慮すると早期出荷の可能性が窺われた。体表面に近い筋肉や脂肪層に関する超音波測定においては,今後枝肉の整形や懸垂冷蔵の影響などをより詳細に検討する必要があると思われた。
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黒毛和種繁殖雌牛の繁殖形質における遺伝的趨勢および体測定値との関連性
徳永 忠昭, 氏益 誠一, 石田 孝史, 原田 宏
肉用牛研究会報 93 6 - 9 2012年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：肉用牛研究会
本研究では,2000年2月から2008年12月に宮崎県の都城市および児湯郡において登録検査を受検し2産次までの繁殖情報が整っている13,235頭を供試牛とし,繁殖形質の遺伝的趨勢および繁殖形質と体測定値との関連性について検討した。遺伝率は1産次妊娠期間, 2産次妊娠期間,空胎期間および分娩間隔で0,68,0.53,0.11および0,09,また,体高,尻長およびかん幅で0.81,0.62および0.62であった。育種価予測値の出生年次別による妊娠期間の遺伝的趨勢は, 1産次および2産次ともに2000年で最も高い値を示し,それ以降はほぼ横ばいで推移した。空胎期間と分娩間隔は,年々減少し2006年で最も低い値を示した。空胎期間と1産次妊娠期間に対する体測定値との関連を供試牛の育種価予測値の相関で検討したところ,特に有意な傾向は認められなかったが,繁殖性と増体性がともに優れた種雄牛が確認されたことから,それらの種雄牛を用いた雌牛集団の改良が期待される。
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徳永 忠昭, 石田 孝史, 原田 宏
肉用牛研究会報 92 23 - 27 2012年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：肉用牛研究会
本研究では,超音波診断技術を利用し繁殖雌牛の枝肉形質を測定し,蓄積脂肪と繁殖成績との関連性を明らかにするための検討を行った。超音波診断による蓄積脂肪の平均値は,初回調査時よりも2回目調査時で薄い値を示した。また,栄養度の上昇とともに枝肉形質測定値が増加することが示唆され,特に栄養度と蓄積脂肪間には顕著な変化がみられた。産次については,3～4産次を超えると枝肉形質測定値は減少していくことが認められた。全体の栄養度と各部位別栄養度間では高い相関関係を示し,部位別栄養度と枝肉形質測定値間の相関係数は,BMS間では中程度,他の形質間では比較的高い値を示した。
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徳永 忠昭, 白石 誠, 石田 孝史
日本暖地畜産学会報 54 ( 1 ) 33 - 38 2011年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本暖地畜産学会
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黒毛和種繁殖雌牛集団における近交係数の年次推移と超音波測定による産肉形質の遺伝的趨勢
徳永 忠昭, 下村 麻衣, 石田 孝史
日本暖地畜産学会報 54 ( 1 ) 23 - 31 2011年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本暖地畜産学会
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超音波画像のデジタル情報の利用と産肉形質の早期予測基準値 査読あり
徳永 忠昭, 原田 宏, 坂東島 直人, 川田 洋一, 大山 敏, 横山 喜世志, 徳丸 元幸, 清野 滋美, 石田 孝史
宮崎大学農学部研究報告 50 ( 1 ) 11 - 17 2004年3月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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バークシャー種母豚の産肉形質に関する基礎的研究 査読あり
牧山 大和, 原田 宏, 松窪 敬介, 渡邉 正良, 徳永 忠昭, 石田 孝史
宮崎大学農学部研究報告 50 ( 1 ) 19 - 23 2004年3月
記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）
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肉用牛産肉形質改良への超音波診断装置(SEM-900)の利用 査読あり
徳永 忠昭, 原田 宏, 坂東島 直人, 川田 洋一, 大山 敏, 横山 喜世志, 徳丸 元幸, 清野 滋美, 石田 孝史
宮崎大学農学部研究報告 49 ( 1 ) 49 - 57 2003年3月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（大学，研究機関等紀要）