Influence of feeding a grass hay diet during the early stage of the fattening period on growth performance, carcass characteristics, and meat production in Japanese Black steers
Influence of feeding a grass hay diet during the early stage of the fattening period on growth performance, carcass characteristics, and meat production in Japanese Black steers
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育肥初期饲喂草干草日粮对日本黑牛生长性能、胴体特性和产肉量的影响
DOI：
10.1111/asj.13139
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发表时间：
2018
影响因子：
2
通讯作者：
Matsumoto Kazunori
中科院分区：
文献类型：
--
作者：
Shibata Masahiro;Hikino Yasuko;Matsumoto Kazunori
本试验研究了在肥育早期至中期饲喂大量干草对肉牛生长、胴体性状和肉质性状的影响。将阉牛随机分为干草饲喂组（GHF，n= 6）和精料饲喂组（CF，n= 6）。GHF组的屠宰体重低于CF组，但最终体重组间差异不显著。与CF阉牛相比，GHF阉牛的皮下脂肪和肋骨厚度减少。脂肪含量，单不饱和脂肪酸，和滴水损失的肌肉中GHF公牛比CF公牛。此外，与CF肉牛相比，GHF肉牛中的n-3多不饱和脂肪酸更高。GHF阉牛在育肥中期体重较低，这可能是由于Myostatin表达增加引起的肌肉生长抑制所致;育肥期日增重增加可能是由于Myostatin表达减少引起的肌肉生长激活所致。在早期育肥期饲喂以干草为基础的饮食可能会保持牛肉的定量生产力，类似于饲喂以精料为基础的饮食。
The present study investigated the influence of feeding a large amount of grass hay to steers from the early to middle fattening period on growth, carcass characteristics, and meat characteristics. Steers were randomly divided into grass hay‐fed (GHF,n= 6) and concentrate‐fed (CF,n= 6) groups. The dressed weight of the GHF steers was lower than that of the CF steers, but the final body weight was not significantly different between the groups. The GHF steers had decreased subcutaneous fat and rib thickness compared with the CF steers. Lipid content, monounsaturated fatty acids, and drip loss in the muscles were lower in the GHF steers than in the CF steers. Furthermore, n‐3 polyunsaturated fatty acids were higher in the GHF steers compared with the CF steers. The GHF steers had lower body weight during the middle fattening stage, which may have occurred as a result of muscle growth suppression caused by increasedMyostatinexpression; an increase in daily gain during the finishing period may have occurred as a result of muscle growth activation caused by decreasedMyostatinexpression. Feeding steers a grass hay‐based diet during the early fattening period possibly maintains the quantitative productivity of beef similarly to feeding a concentrate‐based diet.
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