Abstract
The effects of replacing dietary fishmeal with cottonseed protein concentrate (CPC) on the muscle texture and water holding capacity of large yellow croaker Larimichthys crocea were investigated after a 90-day feeding trial. Results showed that the complete substitution of dietary fishmeal with CPC resulted in a significant reduction in muscle drip loss by decreasing collagen content and increasing heat soluble collagen content, without affecting the texture. Moreover, reduced drip loss is contingent upon diminished muscle salt-soluble protein content by enhancing skeletal muscle degradation (ubiquitin-proteasome system, calpain proteases and lysosomal cathepsins) and decreasing energy levels. In conclusion, the substitution of 30% dietary fishmeal with CPC (i.e., 20.94% of CPC in diet) did not show any significant alterations in muscle quality of large yellow croaker. The complete replacement of dietary fishmeal with CPC (i.e., 69.80% of CPC in diet) reduced the water holding capacity of muscle.
Published Version
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