title: Comparative study of the histochemical properties, collagen content and architecture of the skeletal muscles of wild boar crossbred pigs and commercial hybrid pigs.
abstract: The histochemical properties, collagen content and architecture of Musculus longissimusthoracis (LT), Musculus pectoralis profundus (PP) and Musculus biceps femoris (BF) were compared in F(1) (half blood) and F(2) (quarter blood) wild boar crossbred pigs and commercial hybrid pigs, and Japanese wild pigs. F(1) pigs showed the lowest growth rate, followed by F(2) pigs. The most rapid growth was shown by the commercial pigs. The percentage weights of LT and PP muscle to body weight were larger in the wild boar crossbred pigs than commercial pigs. The muscles of the crossbred pigs contained type I and IIA myofibers at higher frequency and type IIB at lower frequency than the commercial pigs, except for LT muscle of F(2) pigs. The myofiber diameter in each type of muscle did not differ between pigs except for the smaller type IIA in BF muscle in commercial pigs. The total amount of intramuscular collagen was less in LT muscles than the others. More intramuscular collagen was found in the wild boar crossbred pigs than the commercial pigs in LT and PP muscles. With an increase of collagen content, the perimysial collagen architecture developed but not the endomysial architecture. Traits characteristic of the crossbred pigs seem to be inherited from the wild boar. Our results clarify that cross breeding with wild boar results in pigs with distinctive muscle characteristics in terms of histochemical properties, collagen content and architecture.
authors: Department of Health and Nutrition, Niigata University of Health and Welfare, Niigata 950-3198, Japan.
authors: Ichiro
authors: I
authors: Oshima
authors: Hisao
authors: H
authors: Iwamoto
authors: Yoshi-Nori
authors: YN
authors: Nakamura
authors: Kazuto
authors: K
authors: Takayama
authors: Yoshitaka
authors: Y
authors: Ono
authors: Tetsuya
authors: T
authors: Murakami
authors: Nobuya
authors: N
authors: Shiba
authors: Shoji
authors: S
authors: Tabata
authors: Shotaro
authors: S
authors: Nishimura