Tropical Animal Health and Production

, Volume 50, Issue 4, pp 801–806 | Cite as

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

  • V. H. Suarez
  • G. M. Martínez
  • J. F. Micheloud
  • A. E. Viñabal
Regular Articles


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.


Cattle Gastrointestinal nematode Epidemiology Effect Tropical Argentina 



The authors thank Agr. Eng. Agustín Krause and the company POCOY SA for their kind hospitality and for providing the opportunity of working in their ranch and to Dr. Raúl Marín and the ranch staff who contributed to this work.

Compliance with ethical standards

The procedures adopted has been approved by the Ethical Review Committee (CICUAL: Institutional Committee of Care and Use of Experimental Animals) of the University of La Plata, Argentina.

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • V. H. Suarez
    • 1
  • G. M. Martínez
    • 1
  • J. F. Micheloud
    • 1
  • A. E. Viñabal
    • 1
  1. 1.INTA, Área de Investigación en Salud Animal-IIACS-CIAP, EEA SaltaSaltaArgentina

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