Jordan H E, Cole N A, McCroskey J E, Ewing S A
Am J Vet Res. 1977 Aug;38(8):1157-60.
Studies on effects of subclinical parasitism (low worm burden) in full-fed and maintenance-fed steers indicated that over a short interval low worm burdens do not have a statistically significant effect on the efficiency of energy utilization. In full-fed steers, energy retention tended to be higher in steers with lower worm burdens (mean 95.8 Ostertagia, 12.5 Cooperia) than in those with higher worm burdens (mean 677.5 Ostertagia, 201.8 Cooperia). Maintenance-fed steers generally had larger numbers of Ostertagia ostertagi and Cooperia spp than did the full-fed steers.
对全喂料和维持喂料的阉牛亚临床寄生虫感染（低蠕虫负荷）影响的研究表明，在短时间内，低蠕虫负荷对能量利用效率没有统计学上的显著影响。在全喂料的阉牛中，蠕虫负荷较低的阉牛（平均奥斯特他线虫95.8条、古柏线虫12.5条）的能量保留往往高于蠕虫负荷较高的阉牛（平均奥斯特他线虫677.5条、古柏线虫201.8条）。维持喂料的阉牛通常比全喂料的阉牛有更多的奥斯特他线虫和古柏属线虫。
