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| Effects of Different Mixed Feeds on Slaughtering Performance, Eating Quality and Nutrients of Dumont Sheep |
| WANG Debao, WANG Xiaodong*, GUO Tianlong, LIANG Junfang, NA Qin, WANG Limei |
| Institute of Agricultural and Livestock Products Processing, Inner Mongolia Agricultural and Animal Husbandry Academy, Hohhot 010031, China |
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Abstract The main aim of this study was to investigate the effects of different feed collocation patterns (total mixed ration (TMR), concentrated feed + sunflower skin (CF + SS), concentrated feed + forage pellets (CF + FP)) on the tenderness, pH value, cooking yield and other eating qualities of longissimus dorsi muscle of Dumont sheep under intensive farming mode. Moisture, ash, protein, fat, free amino acids and fatty acids were measured by the national standard method, automatic amino acid analyzer and gas chromatography. The results showed that dressing percentage and cooking yield of TMR group were significantly higher than those of the other two groups (P < 0.05); a significant decrease in shear stress was observed comparing the TMR and CF + FP groups was significantly lower than that of group (P < 0.05), whereas no significant difference in shear stress existed between the TMR and CF + SS groups (P > 0.05). On the other hand, moisture, ash, crude protein and fat contents were not significantly affected by the diets (P > 0.05). Amino acid contents significantly differed among the three diet groups (P < 0.05); these groups were ranked in increasing order: TMR < CF + SS < CF + FP by essential amino acid contents, and in decreasing order: TMR > CF + FP > CF + SS by the contents of saturated fatty acids, monosaturated fatty acids and polysaturated fatty acids. The ω-3 fatty acid content of the CF + FP group was higher than that of the TMR group (P < 0.05), whereas the lowest ω-3 fatty acid content was found in the CF + SS group. While the TMR group showed good meat processing quality, CF + FP improved the content of functional nutrients.
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2018, Vol. 32 
