Comparative Study of the Collagen Content and Architecture of the Longissimus Muscle in Concentrate- and Forage - fed Male Goats

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Collagen content and architecture of the longissimus thoracis(LT) muscle were compared between the concentrate- and forage-fed male goats. During the experimentsl period of 9 to 26 wks old, the former gained 15.7kg in body weight by feedling on commercial concentrate food and Italian ryegrass hay, while the latter gained only 2.4kg by feedling on hay only. Dry matter, crude fat were contained at significantly higher percentages in the LT muscle of the concentrate-fed goats than the forage-fed goats, and conversaly, collagen content was significantly higher in the muscle of the latter. However, the collagen pyridinoline content did not differ between them. The myofibers in the concentrate-fed goats(54.0μm) were twice the size of those in the forage-fed goats(25.5μm). The higher content of crude fat(2.89%) in the LT muscle of the concentrate-fed goats was not enough for adipose tissues to develop within the perimysium as marbling. Immunohistochemical methods revealed typesⅠ and Ⅲ collagens over both perimysium and endomysium. Thin colagen bundles were loosely distributed in the goats muscles appeared as dense stacks of thick collagen fibers. From these results, it was indicate that the development of loose tissues of slender collagen fibers had an intimate relationship with the rapid growth rate of muscle rather than the development of adipose tissue.
九州大学の論文