Microstructure of skeletal muscles of growing calves fed silage-based vs hay-based diets. II. Fibre type distribution.
Microstructure of skeletal muscles of growing calves fed silage-based vs hay-based diets. II. Fibre type distribution.
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青贮饲料与干草饲料喂养的生长小牛骨骼肌的微观结构。
DOI：
10.1051/rnd:19920305
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
J. Piotrowski
中科院分区：
文献类型：
--
作者：
B. Klosowski;K. Bidwell;D. Kłosowska;J. Piotrowski
如第一部分所述，取2周龄、3月龄和10月龄公牛的背最长肌、半膜肌和半腱肌经屠宰后取材。两周大的小牛只饲喂牛奶。所有剩余的动物从2周后开始喂草、青贮料或干草，以及限量的精料。肌肉纤维按Ziegan(1979)的方法分为快抽动糖酵解纤维、快抽动氧化酵解纤维和慢抽动氧化纤维(FTG、FTO和STO)。每种类型纤维的百分比分布估计与犊牛的年龄和饮食有关。数量最多的总是快速抽动的糖酵解纤维，最低的值出现在2周大的小牛身上。饲料对3月龄小牛犊纤维百分比分布的影响与对10月龄小牛的影响不同。这项研究表明，以青贮饲料为基础的无干草饮食会改变骨骼肌的微结构，从而可能也会影响肉类的质量。
As described in part I, samples of musculus longissimus dorsi, semimembranosus and semitendinosus were obtained post-slaughter from 2-week, 3-month and 10-month-old bull calves. The 2-week-old calves were fed milk only. All the remaining animals were fed grass silage or hay ad lib and a restricted amount of concentrate from 2 weeks of age onwards. Muscle fibres were differentiated according to Ziegan (1979) into fast-twitch glycolytic, fast-twitch oxidoglycolytic and slow-twitch oxidative fibres (FTG, FTO and STO, respectively). The percent distribution of individual types of fibres was estimated as related to the calves age and diet. The most numerous were always fast-twitch glycolytic fibres, the lowest values being observed in the 2-week-old calves. The effect of the diet on fibre percentage distribution in 3-month-old calves differed from that found in 10-month-old animals. This research suggests that a hay-free diet based on grass silage alters the microstructure of skeletal muscles, which thus might also affect the quality of meat.