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<p>This study evaluated growth performance, carcass characteristics, and meat quality of pure Menz sheep, and 50% Dorper × Menz (D×M) and 50% Awassi × Menz (A×M) crosses under two feeding regimes: brewery spent grain plus concentrate (F1) or concentrate-only (F2) used as supplement with natural pasture hay as basal diet. The supplemental feeds were isonitrogenous and isocaloric. Forty-eight castrated yearling rams (16 per genotype) were assigned to the dietary treatments in a 2 × 3 factorial design and the experiment lasted for a period of 90 days. Data on nutrient intake, body weight changes, carcass measurements, and sensory scores were taken and analyzed using the standard procedures. Breed significantly (<i>p</i> &lt; 0.05) influenced final body weight, average daily gain, and carcass traits, with DxM and AxM outperforming Menz sheep. F2 yielded greater feed conversion efficiency than F1 (<i>p</i> &lt; 0.05), while digestibility coefficients did not differ among the treatments (<i>p</i> &gt; 0.05). DxM sheep had higher cold carcass weight, loin cut weight, and fat thickness (<i>p</i> &lt; 0.01), and dressing percentage was greater in F2. Sensory evaluation showed that meat from Menz sheep was preferred from tenderness, juiciness, flavor, and overall acceptability (<i>p</i> &lt; 0.01) compared to other sheep breeds. Significant breed <Emphasis Type="BoldItalic">×</Emphasis> feed interactions for sensory attributes indicated genotype-specific dietary response. Strong positive correlations (<i>r</i> = 0.72–0.95, <i>p</i> &lt; 0.01) between growth and carcass yield highlight the predictive value of performance traits for meat output. Based on marginal rate of return and superior carcass yield, A×M sheep are strongly recommended under both brewery spent grain plus concentrate (F1) and concentrate-only (F2) feeding regimes, while D×M sheep are recommended under the F1 feeding regime.</p>

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Comparative evaluation of growth performance, carcass yield and meat quality attributes of crossbred Dorper and Awassi, and indigenous Menz sheep supplemented with brewery spent grain

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Asfaw Bisrat,
  • Mekete Bekele,
  • Ahmed Hassen,
  • Liulseged Alemayehu,
  • Jane Wamatu,
  • Muluken Zeleke,
  • Aschalew Abebe,
  • Tesfa Getachew,
  • Firdawok Ayele,
  • Derib Aydefruhim,
  • Ayele Abebe,
  • Enyiew Alemnew,
  • Ashenafi Kebede,
  • Mesfin Eshete,
  • Tefera Mekonen,
  • Beneberu Tefera,
  • Aemiro Bezabih,
  • Adebabay Kebede,
  • Admassu Lakew,
  • Tesfaye Getachew,
  • Aynalem Haile

摘要

This study evaluated growth performance, carcass characteristics, and meat quality of pure Menz sheep, and 50% Dorper × Menz (D×M) and 50% Awassi × Menz (A×M) crosses under two feeding regimes: brewery spent grain plus concentrate (F1) or concentrate-only (F2) used as supplement with natural pasture hay as basal diet. The supplemental feeds were isonitrogenous and isocaloric. Forty-eight castrated yearling rams (16 per genotype) were assigned to the dietary treatments in a 2 × 3 factorial design and the experiment lasted for a period of 90 days. Data on nutrient intake, body weight changes, carcass measurements, and sensory scores were taken and analyzed using the standard procedures. Breed significantly (p < 0.05) influenced final body weight, average daily gain, and carcass traits, with DxM and AxM outperforming Menz sheep. F2 yielded greater feed conversion efficiency than F1 (p < 0.05), while digestibility coefficients did not differ among the treatments (p > 0.05). DxM sheep had higher cold carcass weight, loin cut weight, and fat thickness (p < 0.01), and dressing percentage was greater in F2. Sensory evaluation showed that meat from Menz sheep was preferred from tenderness, juiciness, flavor, and overall acceptability (p < 0.01) compared to other sheep breeds. Significant breed × feed interactions for sensory attributes indicated genotype-specific dietary response. Strong positive correlations (r = 0.72–0.95, p < 0.01) between growth and carcass yield highlight the predictive value of performance traits for meat output. Based on marginal rate of return and superior carcass yield, A×M sheep are strongly recommended under both brewery spent grain plus concentrate (F1) and concentrate-only (F2) feeding regimes, while D×M sheep are recommended under the F1 feeding regime.