ウシ骨格筋における筋線維横断面積の標本採取部位による変動

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  • Variance of Cross-sectional Areas of Muscle Fibers among Sampling Positions in Skeletal Muscles of Cattle
  • ウシ コッカクキン ニ オケル キンセンイ オウダン メンセキ ノ ヒョウホン

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The variances of muscle fiber sizes among sampling positions were studied by measuring the cross-sectional areas of individual fibers. Seven muscles were obtained from four steers of Holstein which were grouped into two different body weights. The number of sampling positions was from 3 to 5 in each muscle. Tissue sections were stained with eosin only. Crosssectional areas of one hundred muscle fibers in each sampling position were measured using an image analyzer. Subsequently, the means of these 100 measurements were statistically analyzed for each sampling position. The effects of body weight, cattle, muscle and sampling position in seven muscles were significant. The means of cross-sectional muscle fiber areas varied significantly among cattle and among sampling positions in each muscle. Only in the m. deltoideus, the means of muscle fiber areas of the sampling positions 3 and 5 were the largest and the smallest in all the cattle, respectively. In the m. longissimus, the means of muscle fiber areas of superficial sampling position were significantly smaller than those of profound sampling position. In the m. longissimus and m. semitendinosus, the distribution patterns of muscle fiber sizes showed large differences among the sampling positions in all the cattle. Proportion of their muscle fibers of 1000-5000μm2 in the cross-sectional area was 80% or more. In the m. psoas minor and m. rectus thoracis, differences in the patterns of distribution were small in all the cattle. Their muscle fibers of less than 1000μm2 were over 50% and muscle fibers of over 2500μm2 were not determined. In conclusion, the variance of the means of cross-sectional muscle fiber areas among the sampling positions was considerably large. The difference in the distribution pattern of cross-sectional muscle fiber area also became larger among the sampling positions when the number of thick muscle fibers increased. It was suggested that increasing the number of sampling positions was important to reveal the effects of body weight and cattle on the cross-sectional area of muscle fibers.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 66 (5), 399-405, 1995

    公益社団法人 日本畜産学会

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