Abstract
The aim of this cross-sectional observational study was to determine the frequency and factors associated with infection by Eimeria spp. and gastrointestinal nematodes in 356 calves on 20 dairy farms located in southern Minas Gerais, Brazil. Ten species of Eimeria spp. were identified, of which E. bovis (37.6%) and E. zuernii (17.9%) were the most frequent. From fecal cultures, four genera of gastrointestinal nematodes were recovered, of which Cooperia spp. (74.6%) and Haemonchus (19.4%) were the most frequent. Variables relating to higher levels of technology used on dairy farms showed a significant association (p < 0.05) with higher OPG and EPG counts, and are discussed in this study.
Highlights
Among the factors that interfere in cattle development, gastrointestinal parasites such as Eimeria spp. and helminths stand out because of the economic losses that they cause in relation to low herd productivity, delayed animal development, death and significant expenses on management and medication.Studies have shown that the intensity of Eimeria parasite species and gastrointestinal parasites in cattle varies between different regions of Brazil (REBOUÇAS et al, 1994; LIMA, 1998; ALMEIDA et al, 2011)
The aim of this cross-sectional observational study was to determine the frequency and factors associated with infection by Eimeria spp. and gastrointestinal nematodes in 356 calves on 20 dairy farms located in southern Minas Gerais, Brazil
The objectives of this study were to determine the frequencies of Eimeria spp. and gastrointestinal nematodes among dairy calves, and to evaluate factors inherent to zoosanitary management that are associated with occurrences of these parasites in herds in the southern region of the state of Minas Gerais
Summary
Studies have shown that the intensity of Eimeria parasite species and gastrointestinal parasites in cattle varies between different regions of Brazil (REBOUÇAS et al, 1994; LIMA, 1998; ALMEIDA et al, 2011) This has a negative impact of varying degree on dairy production among these regions, indicating that there is a need for knowledge on the prevalence of these parasite species among herds. For effective control over gastrointestinal nematodes, the objectives of this study were to determine the frequencies of Eimeria spp. and gastrointestinal nematodes among dairy calves, and to evaluate factors inherent to zoosanitary management that are associated with occurrences of these parasites in herds in the southern region of the state of Minas Gerais This information is relevant because it forms a preliminary stage in devising control schemes against these parasites in dairy herds
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