A Beef Production System and Meat Quality Using Grazing and Self-Sufficient Feed

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  • NAKAMURA Yoshi-Nori
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • HIRANO Kiyoshi
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • NAKANISHI Yuji
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • KAMIYA Mitsuru
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • TSUNEISHI Eisaku
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • KATO Naoki
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • HAYASHI Yoshirou
    National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • YAMADA Akihisa
    National Agricultural Research Center for Kyushu Okinawa Region, NARO

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Other Title
  • 放牧と自給飼料を組み合わせた新しい肉用牛生産方法“草地育成・肥育技術”の可能性と肉質の特徴
  • ホウボク ト ジキュウ シリョウ オ クミアワセタ アタラシイ ニクヨウギュウ セイサン ホウホウ ソウチ イクセイ ヒイク ギジュツ ノ カノウセイ ト ニクシツ ノ トクチョウ

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Abstract

We investigated the possibility of a beef production system using year-round outdoor grazing and self-sufficient feed supplies such as corn silage for Japanese Brown (Kumamoto) (JB-K) (n = 3, 6-7 mo, 253±7 kg) and Japanese Black (JB) (n = 6, 6-7 mo, 230±17 kg) steers in southern Japan. JB-K and JB steers were grazed year-round outdoors on pasture, predominantly Italian ryegrass in the winter season and bahiagrass in summer. Cattle grazed until they reached a slaughter body weight of 751±15 kg (JB-K) and 613±15 kg (JB steers). Animals were fed corn silage in addition to their grazing of pasture from 24 months of age. JB-K steers achieved high (0.8-1.4 kg/day) daily weight gain during the grazing period compared with JB steers (0.4-0.9 kg/day). Plasma composition was affected by the chemical composition of the feed; in particular, the low crude protein of bahiagrass and corn silage. After slaughter, the carcass grade for JB-K and JB steers were A-2 and B-2, respectively. Both the shear-force value and collagen content of the longissimus thoracis muscle of JB-K steers were higher than those of JB steers. Both JB-K and JB steers showed high protein and low lipid contents in addition to high vitamin contents compared with those conventional beef. These results may have been affected by the vitamin composition of grass and the development of connective tissue in skeletal muscle as a result of grazing.

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