Abstract
In the Experimental Farm of the Universidade Federal de Lavras (EF-UFLA), state of Minas Gerais, Brazil, on their day of birth, female Holstein calves were randomly selected and placed into two groups containing fifteen animals each: Strategic-Selective Treatment (S-ST) or Conventional Treatment (CT). In the S-ST, calves were treated after coproparasitological examinations according to criteria established previously by the researchers. Calves in the CT were treated according to the opinion of the veterinarian of EF-UFLA. For statistical analysis, the frequency (%) of fecal samples with count of eggs per gram of feces (EPG) ≥300, count of oocysts per gram of feces (OoPG) ≥500 and fecal samples with count of cysts of Giardia spp. ≥1 were conducted. The overall average frequency of fecal samples with EPG ≥300, OoPG ≥500 and Giardia spp. cysts ≥1, respectively, was similar (p >0.05) between S-ST (20.3%; 17.3%; and 31.5%) and CT (26.4%; 23.9%; and 37.3%). The effective operational cost, per animal, in 12 months, was of R$ 784.58 (US$ 241.41) and R$ 83.90 (US$ 25.81) in S-ST and CT, respectively. The S-ST requires adjustments to be used as a technically efficient and economically viable alternative for the control of gastrointestinal parasitosis in female Holstein calves.
Highlights
Brazil possesses one of the largest cattle herd in the world, with about 210 million of head (BRASIL, 2014)
The present study was conducted at the Experimental Farm of the Universidade Federal de Lavras (FE-UFLA) located in the municipality of Ijaci (21°10′12′′ S and 44°55′30′′ W), state of Minas Gerais, Brazil, from April 2013 to November 2014, after approval had been obtained from the Ethical Committee of the Use of Animals in Research of the UFLA and registered under the number 106/12
There was no significant difference (p >0.05) in the overall average frequency of the fecal samples eggs per gram of feces (EPG) ≥300 in the Strategic-Selective Treatment (S-ST) (20.27%; 74/365) than in the Conventional Treatment (CT) (26.43%; 83/314). This result can be partially explained by the resistance of Fazenda Experimental da Universidade Federal de Lavras (FE-UFLA) nematodes to 3.5% ivermectin, because the efficacies was low in FECRT (61.14% ± 26.99%), which is a phenomenon already confirmed by other researchers in the state of Santa Catarina (SOUZA et al, 2008)
Summary
Brazil possesses one of the largest cattle herd in the world, with about 210 million of head (BRASIL, 2014). In intensive dairy production systems, damage caused by GINs in cattle is amplified, leading for intensive use of anthelmintic drugs. These products are administered based on a single criterion, namely the physical condition of the animal. It is characterized as a conventional treatment, since it is adopted by the majority of dairy farms (ANTONELLO et al, 2010; KENYON & JACKSON, 2012). In the selective treatment only animals with high infection levels, identified by stool tests, are treated rather than treating the entire herd (O’SHAUGHNESSY et al, 2015)
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Schedule a callMore From: Revista brasileira de parasitologia veterinaria = Brazilian journal of veterinary parasitology : Orgao Oficial do Colegio Brasileiro de Parasitologia Veterinaria
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