首页> 外文期刊>Veterinary Parasitology >Effect of longitude and latitude on fecal egg and oocyst counts in cow-calf beef herds from the United States Northern Great Plains
【24h】

Effect of longitude and latitude on fecal egg and oocyst counts in cow-calf beef herds from the United States Northern Great Plains

机译:经度和纬度对美国北部大平原牛犊牛群粪便卵和卵囊数的影响

获取原文
获取原文并翻译 | 示例
       

摘要

This study evaluated potential relationships between parasite egg/oocyst outputs in cow-calf beef herds located within the United States Northern Great Plains and herd longitude and latitude. Management of study herds was typical of herds from this region. Parasite egg/oocyst counts were measured from 10 cows and 5 calves selected from each herd near the end of the traditional grazing season (October 1993). The types and numbers of eggs and oocysts recovered from both cows and spring-born calves were consistent with those described in other studies. No significant relationship between fecal egg/oocyst counts and latitude was observed in calves or cows. Monezia egg output exhibited no significant correlation with longitude for calves or cows. In cows, a significant negative correlation was detected between coccidian oocyst counts and herd longitude but not between helminth egg counts and longitude. In calves, Nematodirus, trichostrongyle and Trichuris egg output and coccidian oocyst output were all negatively correlated with longitude. This negative correlation suggests that nematode populations within the study area decreased slightly from an east to west direction.
机译:这项研究评估了位于美国大平原北部的牛犊牛群中寄生虫卵/卵囊产量与群经度和纬度之间的潜在关系。对研究种群的管理是该地区典型的种群。在传统放牧季节快要结束时(1993年10月),从每头牛群中选出的10头母牛和5头小牛测量了寄生虫卵/卵囊的计数。从母牛和春季出生的牛犊中回收的卵和卵囊的类型和数量与其他研究中描述的一致。在小牛或母牛中,未观察到粪卵/卵囊计数与纬度之间的显着关系。 Monezia的产蛋量与犊牛或母牛的经度没有显着相关性。在奶牛中,在球虫卵数与牛群经度之间发现了显着的负相关,而在蠕虫卵数与经度之间却没有发现。在小牛中,线虫,毛线虫和Trichuris的卵产量和球虫卵囊产量均与经度呈负相关。这种负相关关系表明研究区域内的线虫种群从东向西略有减少。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号