The Effects of in Ovo Insulin-Like Growth Factor-1 on Embryonic Development of Musculus Longus Colli Dorsalis in Japanese Quail


Abstract: The objective of the present study was to evaluate the effects of insulin-like growth factor-1 (IGF-1) on the histological development of the thoracic part of the m. longus colli dorsalis (m. spinalis thoracis) in Japanese quail embryos. A single in ovo dose of recombinant human IGF-1 (rhIGF-1) (100 ng embryo^{-1}) was administered through the blunt end of eggs via a single hole made with a dental drill bit, without penetrating the chorioallantoic membrane. For histological evaluation, the embryos were collected daily from days 7 to 16 of embryonic development (E). In ovo administration of rhIGF-1 increased the diameter of muscle fibers on E7, 9, 10, 11, and 13. Additionally, in ovo rhIGF-1 also increased the number of muscle fibers (P < 0.001). It was concluded that rhIGF-1 accelerated skeletal muscle development in the quail embryos.

Keywords: Quail, skeletal muscle development, rhIGF-1, in ovo

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