Losinger W C
Centers for Epidemiology and Animal Health, US Department of Agriculture, Fort Collins, CO 80521, USA.
Prev Vet Med. 1997 Jul;31(1-2):15-8. doi: 10.1016/s0167-5877(96)01136-1.
Producers participating in the United States National Animal Health Monitoring System 1994-1995 Cattle on Feed Evaluation provided information on cattle of Mexican origin in their feedlot operations. Cattle of Mexican origin accounted for 8.1% of cattle placed on United States feedlots from 1 July 1993 through 30 June 1994. Of operations with a one-time capacity of 1000 or more cattle, 12.8% placed cattle of Mexican origin on their feedlots over this time frame. Very few operations (about 1%) reported cattle of Mexican origin at the same time as cattle to be used for breeding in the United States.
参与美国国家动物健康监测系统1994 - 1995年育肥牛评估的生产商提供了其饲养场中墨西哥原产牛的相关信息。1993年7月1日至1994年6月30日期间，墨西哥原产牛占进入美国饲养场牛只总数的8.1%。在一次性饲养能力为1000头或更多牛只的饲养场中，有12.8%在这一时期在其饲养场中饲养了墨西哥原产牛。极少有饲养场（约1%）报告在饲养用于美国繁殖的牛的同时饲养了墨西哥原产牛。
