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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (11): 75-85.DOI: 10.11686/cyxb2021439

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Effects of dietary neutral detergent fiber on muscle fiber type composition and meat quality characteristics of black Tibetan sheep

Li ZHOU1,2(), Zhi-you WANG1, Bao-chun YANG1, Sheng-zhen HOU1, Feng-shuo ZHANG1, Lin-sheng GUI1()   

  1. 1.College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,China
    2.College of Agriculture,Ningxia University,Yinchuan 750021,China
  • Received:2021-11-27 Revised:2022-01-17 Online:2022-11-20 Published:2022-10-01
  • Contact: Lin-sheng GUI

Abstract:

The effects of different neutral detergent fiber (NDF) diets on body size indexes, muscle fiber type and meat quality of Qinghai black Tibetan sheep were investigated. Forty healthy 2-month-old black Tibetan sheep with similar body weights [(10.28±0.43 kg] were randomly divided into 2 groups with 20 rams per group. They were fed diets with differing neutral detergent fiber (NDF) levels of 26.33% (group L) and 46.14% (group H). Using enzyme-linked immunosorbent assay, ATPase histochemical stain and real-time PCR, the muscle fiber characteristics, gene expression of myosin heavy chains (MyHCs) and meat quality in Black Tibetan sheep were evaluated. Results were as follows: 1) The tagma indexes in group H were significantly lower than those in group L (P<0.05). 2) The number of type Ⅱa muscle fibers in group H was significantly more than in group L (P<0.05), and the areas of type Ⅰ and type Ⅱa muscle fibers in group H were also greater than in group L (P<0.05).3) The mRNA expression levels of MyHC Ⅰ and MyHC Ⅱa in group L were lower than those in group H (P<0.05), but the mRNA expression levels of MyHC Ⅱb and MyHC Ⅱx exhibited an opposite movement (P<0.05). 4) Compared with group L, superoxide dismutase, glutathione peroxidase, catalase and total antioxidant capacity contents increased (P>0.05) in group H, while the malondialdehyde (MDA) content was significantly decreased with in group L. 5) The muscle shear force in Group L was higher than that in Group H (P<0.05), while the redness (a*) was lower than that in Group H (P>0.05). In conclusion, compared with a low-NDF diet, the high-NDF diet effectively reduced the proportion of glycolic muscle fiber and also enhanced antioxidant capacity, improving the muscle quality of black Tibetan sheep.

Key words: muscle fiber, black Tibetan sheep, myosin heavy chains, antioxidant index, edible quality, meat quality, body size