Departamento de Producción Animal, Universidad de Córdoba, Ctra. Madrid-Cádiz Km. 396-a, 14071 Córdoba, Spain.
Meat Sci. 2014 Jan;96(1):247-55. doi: 10.1016/j.meatsci.2013.07.012. Epub 2013 Jul 18.
The growth and breed-related changes of rib and rump characteristics in lean beef cattle and the ability of ultrasound to predict carcass traits were investigated. Three hundred bulls from three breeds were scanned monthly (6-7 times) using real-time ultrasound with final scans taken <7 days prior to harvest. The rib and rump ultrasound measurements, except intramuscular fat content, increased (P<0.05) with live weight. Breed affected most of traits. The 12th rib ultrasound measurements showed a weak to high positive correlation (0.131 to 0.976, P>0.05 to P<0.001) with 12th rib measurements in the carcass. Regression equations developed with the ultrasound measurements, explained 97% of the variation in longissimus muscle area, 88% of the variation in fat thickness and 57% of the variation in intramuscular fat content. When last ultrasound scan measurements were excluded from prediction equations, the R(2) significantly decreased. Ultrasound measures "in vivo" are viable options for assessing carcass attributes of lean cattle.
研究了瘦肉型肉牛肋骨和臀部特征的生长和繁殖相关变化，以及超声在预测胴体特征方面的能力。使用实时超声对来自三个品种的 300 头公牛进行了每月（6-7 次）扫描，最后一次扫描在收获前<7 天进行。除了肌内脂肪含量外，肋骨和臀部的超声测量值随活重增加而增加（P<0.05）。品种影响大多数特征。第 12 肋骨的超声测量值与胴体第 12 肋骨测量值之间存在弱到高度正相关（0.131 至 0.976，P>0.05 至 P<0.001）。用超声测量值建立的回归方程解释了背最长肌面积变化的 97%、脂肪厚度变化的 88%和肌内脂肪含量变化的 57%。当从预测方程中排除最后一次超声扫描测量值时，R(2)显著降低。超声测量值“体内”是评估瘦肉牛胴体属性的可行选择。
