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Epidemiology and effect of gastrointestinal nematodes on beef cattle from tropical Argentina

机译：热带阿根廷牛肉牛胃肠道线虫的流行病学和影响

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The aim of this work was to study the epidemiology and the harmful effect of gastrointestinal nematodes (GINs) on beef cattle in the piedmont forest and grassland region of northwestern Argentina, between March 2015 and March 2016. Sixty weaned female calves were divided into three groups: STG-calves treated systematically with 200 mcg/kg moxidectin every 40-50 days; LTG-calves treated as usually locally implemented, with 200 mcg/kg ivermectin on May 4 and August 5; and UTG-calves not receiving treatment. Moreover, a group of 20 untreated first-calving cows was monitored. Eggs per gram of faeces (epg) and faeces cultures were performed. Live weight gain (LWG) was recorded. Differences among groups were compared using analysis of variance and Tukey test. At the start of the experiment, mean epg was from moderate to high (595 +/- 480); therefore, this group was treated in May. Mean UTG epg peaked (907 +/- 754) in mid-winter, decreasing toward spring. LTG epg only decreased partially after treatment, showing 54.2% of ivermectin efficacy. Epg values of STG were always negligible values (95.8% of moxidectin efficacy). The dominant nematode genus was Cooperia (81.9%), followed by Haemonchus (15.5%). The effect of treatments was evident from middle autumn, with STG showing a significantly (p & 0.002) higher LWG than the other groups. Toward the end of the trial, LWG of STG and LTG increased by 27.2 and 8.2%, respectively, to those of UTG. This preliminary study showed a winter epg peak and a negative effect of GINs on LWG, even in moderately infected calves.
机译：这项工作的目的是研究2015年3月和2016年3月在西北部和2016年3月之间的山地林和草原地区肉豆牛粪牛的流行病学和有害影响。六十次断奶女小牛分为三组：每40-50天每40-50天系统地用200mcg / kg丙二屈指霉菌治疗stg-calves; LTG-Calves通常在本地实施，5月4日和8月5日在200mg / kg伊维菌蛋白中进行;而Utg-犊牛没有接受治疗。此外，监测了一组20个未处理的第一奶牛。进行每克粪便（EPG）和粪便文化进行鸡蛋。记录实时体重增加（LWG）。使用差异分析和Tukey测试进行比较组之间的差异。在实验开始时，平均ePG从中度到高（595 +/- 480）;因此，该组在5月份进行了治疗。平均UTG EPG在冬季达到峰值（907 +/- 754），朝着春天逐渐减少。 LTG EPG治疗后仅部分减少，显示伊维菌素功效的54.2％。 STG的EPG值总是可忽略不计的值（莫克利菌蛋白功效的95.8％）。占优势的线虫属是合作社（81.9％），其次是Haemonchus（15.5％）。治疗的效果是从中秋开始的明显，STG显示出显着的（P＆amp; 0.002）的LWG比另一组更高。在试验结束时，STG和LTG的LWG分别增加了27.2％和8.2％至UTG。这种初步研究表明，即使在中等感染的小牛中，冬季EPG峰值和LWG对LWG的负面影响。

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