Abstract：
The aim was to evaluate the quality of the sheep skin of different sex classes submitted to different levels of feed restriction. Sheep without defined racial pattern of different sex classes (15 non-castrated males, 15 castrated males and 15 females), with initial body weight of 18.1 ± 0.4 kg and mean age of 90 days were distributed in a factorial 3 × 3, with three sex classes and 3 levels of feed restriction (ad libitum intake and restricted intake at 70 and 80%), with 5 repetitions. After slaughter, the skins were collected for physical-mechanical tests. The effect of the sex classes x levels of dietary restriction interaction was observed for transverse thickness and longitudinal rupture elongation (p < 0.05). Animals fed ad libitum had greater longitudinal transverse thickness (p < 0.05). Animals fed ad libitum and 70% feed restriction showed greater transverse elongation at break (p < 0.05). As for the difference between sex classes in the transverse thickness variable for tearing strength, the interaction sex classes x levels of feed restriction for transverse thickness, longitudinal thickness, transverse tearing strength and longitudinal tearing strength occurred (p < 0.05). Feed restriction reduces the physical quality of the skin of sheep of different sex classes, and the use of castrated male sheep in positive energy balance is recommended to obtain leather with greater thickness, longitudinal rupture elongation and transverse tear strength.
摘要：
目的是评估接受不同程度的饲料限制的不同性别类别的绵羊皮的质量。没有不同性别类别的明确种族模式的绵羊(15名非阉割雄性，15个cast割的男性和15个女性），初始体重为18.1±0.4公斤，平均年龄为90天，以3×3的阶乘分布，有三个性别类别和3个饮食限制水平（随意摄入和70％和80％的限制摄入），5次重复屠宰后,收集皮肤进行物理力学测试。对于横向厚度和纵向断裂伸长,观察到性别类别x饮食限制相互作用水平的影响(p<0.05)。随意饲喂的动物具有更大的纵向横向厚度(p<0.05)。随意饲喂和70%饲喂限制的动物在断裂时显示更大的横向伸长(p<0.05)。至于撕裂强度的横向厚度变量的性别类别之间的差异，交互性别类别x横向厚度的饲料限制水平，纵向厚度,横向撕裂强度和纵向撕裂强度发生（p<0.05）。限制采食会降低不同性别类别绵羊皮肤的身体素质，建议在正能量平衡中使用去势雄羊，以获得厚度更大的皮革，纵向断裂伸长率和横向撕裂强度。
