Carcass characteristics of Santa Ines sheep with different biotypes and slaughtering weights

SUMMARY This study evaluated the characteristics of carcass and commercial cuts of Santa Ines lambs of different biotypes (traditional and modern) slaughtered at 32 kg and 34 kg. The thirty-six Santa Ines sheep used, of which 18 traditional and 18 modern biotypes were on average 180 days old and weighed 16 kg initially. The animals were kept in individual stalls (0.80 × 1.20 m) until they reached the slaughtering weight. The experimental design was completely randomized, factorial 2×2 (two biotypes x two slaughtering weights). The traditional biotype influenced significantly (P<0.05) the carcass yields, conformation, and marbling, compared to the modern biotype. The biotype did not influence (P> 0.05) carcass morphometric measurements and commercial cuts. On the other hand, the 34-kg slaughtering weight affected most of carcass characteristics. The traditional biotype displayed higher yield, better conformation and greater amount of intramuscular fat in the carcass. The higher slaughtering weight influenced carcass characteristics and the amount of fat. Generally, the carcasses presented high muscle proportion and fat amount appropriate to the consumer.

摘要 本研究评估了不同品系（传统型与现代型）圣塔伊内斯羔羊（Santa Ines）分别以32kg、34kg体重屠宰后的胴体及商品分割肉性状。试验所用36只圣塔伊内斯羔羊中，18只为传统品系、18只为现代品系，初始平均日龄为180天，初始体重为16kg。试验动物单栏饲养（栏舍规格0.80×1.20m），直至达到预定屠宰体重。试验采用完全随机2×2因子设计（2个品系×2个屠宰体重）。与现代品系相比，传统品系对胴体产率、体型外观及大理石纹评分具有显著影响（P<0.05）；但品系对胴体形态测量指标及商品分割肉产量无显著影响（P>0.05）。另一方面，34kg屠宰体重对多数胴体性状具有显著影响。传统品系的胴体产率更高、体型外观更优，且肌内脂肪含量更高。更高的屠宰体重会影响胴体性状与脂肪含量。总体而言，试验组胴体肌肉占比高，脂肪含量符合消费者需求。