Brink D R, Lowry S R, Stock R A, Parrott J C
Dept. of Anim. Sci., Univ. of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1990 May;68(5):1201-7. doi: 10.2527/1990.6851201x.
Relationships of gain, intake, feed efficiency and severity of liver abscesses were evaluated in 12 experiments involving 566 head of individually fed cattle. Concentrate level in the diets ranged from 64 to 95%. In all experiments, livers were scored as unabscessed (0), one or two small abscesses (A-), two to four small active abscesses (A) or one or more large, active abscesses (A+). Based on homogeneity of variances, nine of the experiments were divided into two groups. In one group (four experiments) the incidence of liver abscesses was 32.1% and no significant (P greater than .25) effects of liver abscess severity score on feedlot performance variables were found. In the second group (five experiments), the incidence of liver abscesses was 77.7%. In the second group, liver abscess severity score affected final live weight (P less than .10), hot carcass weight (P less than .0001), dry matter intake (P less than .10), daily gain based on live weight recorded 24 h prior to slaughter (P less than .10), daily gain based on live weight estimated from hot carcass weight with a 62% dressing percentage (P less than .0001), feed efficiency using final live weight estimated from hot carcass weight (P less than .0001) and dressing percentage (P less than .01). In all cases, performance means for cattle with A+ liver scores were the only ones that differed significantly from those of non-abscessed cattle.
在涉及566头单独饲养牛的12项试验中，对增重、采食量、饲料效率和肝脓肿严重程度之间的关系进行了评估。日粮中的精料水平为64%至95%。在所有试验中，肝脏被评定为无脓肿（0）、有一两个小脓肿（A-）、有两到四个小的活动性脓肿（A）或有一个或多个大的活动性脓肿（A+）。基于方差齐性，其中9项试验被分为两组。在一组（4项试验）中，肝脓肿的发生率为32.1%，未发现肝脓肿严重程度评分对育肥性能变量有显著（P大于0.25）影响。在第二组（5项试验）中，肝脓肿的发生率为77.7%。在第二组中，肝脓肿严重程度评分影响最终活重（P小于0.10）、热胴体重（P小于0.0001）、干物质采食量（P小于0.10）、基于屠宰前24小时记录的活重的日增重（P小于0.10）、基于热胴体重估计的活重且屠宰率为62%的日增重（P小于0.0001）、使用基于热胴体重估计的最终活重的饲料效率（P小于0.0001）和屠宰率（P小于0.01）。在所有情况下，肝评分为A+的牛的性能均值是唯一与无脓肿牛的性能均值有显著差异的。
