@article{oai:repository.naro.go.jp:00001752,
 author = {中西, 直人 and NAKANISHI, Naoto and 山田, 知哉 and YAMADA, Tomoya and 村元, 隆行 and MURAMOTO, Takayuki and 河上, 眞一 and KAWAKAMI, Shinichi and 相川, 勝弘 and AIKAWA, Katsuhiro},
 journal = {近畿中国四国農業研究センター研究報告, BULLETIN of THE NATIONAL AGRICULTURAL RESEARCH CENTER for WESTERN REGION},
 month = {Feb},
 note = {The objective of the present study is to clarify the effect of roughage level during the raising periods on the growth, meat quality and body composition of Japanese Black steers. In the first experiment, 12 calves were weaned at 5 months and divided into two groups. The concentrate was restricted to 1% of body weight and hay (Italian ryegrass) fed ad libitum during the raising period (5 to 10 months old) (HR1group). In the LR1 group, steers were fed concentrate and hay ad libitum during the raising period. Both groups were fed in the same way during the fattening periods (from 11 months until slaughter). The ratio of concentrate to hay on total digestible nutrients (TDN) basis was 65 : 35 during the first 5 months, 80 : 20 during the second five months, and 90 : 10 during the last 8 months. In the second experiment, nine Japanese Black steer calves were weaned at 5 months and divided into two groups. The feeding method of the LR2 group in the second experiment was almost identical to the LR1 group in the first experiment during the raising periods (5 to 10 months old). The steers of the HR2 group were fed concentrate at 0.7% of body weight and soybean meal at 0.3% of body weight. Hay was fed ad libitum to the HR2 group during the raising period. Both groups were fed in the same way during the fattening period (18 months). The ratio of concentrate to hay on a TDN basis was 85 : 15 during the first 10 months and 90 : 10 during the last 8 months. 1. Results of the feed intake and growth The roughage intake of the HR1 group was higher than that of the LR1 group, and the concentrate intake and daily gain of the HR1 group were lower than those of the LR1 group during the raising period. During the first stage of fattening (5 months), the roughage intake of the HR1 group was significantly higher than that of the LR1 group in the first experiment. There were no differences in the concentrate and roughage intake between the two groups during the entire fattening period. The daily gain of the entire fattening period in the HR group tended to be higher than that of the LR group in the first and second experiments. 2. Results of the carcass grading There were no differences in the carcass grading and physico-chemical property of the longissimus dorsi between the two groups, although the subcutaneous fat thickness of the LR1 group was significantly greater than that of the HR1 group. The results of the second experiment were similar to those of the first experiment. 3. Results of the body composition There were no differences in the carcass, meat, and fat weight between the two groups, although the bone weight of the HR1 group was greater than that of the LR1 group. The bone weight of the HR2 group was significantly greater than that of the LR2 group. The carcass fat percentage of the HR group tended to be lower than that of the LR group, and the bone percentage of the HR group tend to be higher than that of the LR group in the first and second experiments. There were no differences in the weights of the digestive tract, omental fat, and mesenteric fat between the two groups of both experiments. We conclude that dietary roughage level during raising period affects the growth performance and carcass composition of Japanese Black steers.},
 pages = {29--39},
 title = {育成期間の粗飼料給与量が黒毛和種去勢牛の産肉性に及ぼす影響},
 volume = {10},
 year = {2011},
 yomi = {ナカニシ, ナオト and ヤマダ, トモヤ and ムラモト, タカユキ and カワカミ, シンイチ and アイカワ, カツヒロ}
}