Evaluation of relationship between repeat breeding and Fasciola hepatica and hydatid cyst infections in cows in Elazig district of eastern Turkey

Epidemiology and impact of Fasciola hepatica exposure in high-yielding dairy herds

“…Small variations that depend on lactation stage may be masked in whole herd data, and changes to butterfat and protein content may be more marked in a breed with higher butterfat percentages than the Holstein–Friesian. Effects on fertility were not significant in this group of herds when yield was controlled for, and this is in agreement with some previous studies ( Simsek et al, 2007; Mezo et al, 2011 ) although others did find an effect ( Dargie, 1987; Charlier et al, 2007 ). Again, these effects are likely to be small and depend on the breed and management system.…”

“…Some studies found a reduction in butterfat content ( Horchner et al, 1970; Black and Froyd, 1972; Charlier et al, 2007; Khan et al, 2009, 2011 ), although others did not ( Mezo et al, 2011; Charlier et al, 2012 ). Reported effects on fertility vary, with some studies reporting an increased calving interval, or delayed puberty in young animals ( Lopez-Diaz et al, 1998; Charlier et al, 2007 ), whereas others found no difference ( Simsek et al, 2007; Mezo et al, 2011 ). The magnitude of the effect depends on the breed of cow and the husbandry system used, which varies greatly between countries studied, even within western Europe ( Bennema et al, 2010; Mezo et al, 2011 ).…”

Association between anti-F. hepatica antibody levels in milk and production losses in dairy cows

“…Moreover, alterations in steroid catabolism probably only occur when animals harbour high fluke burdens, which are not common in naturally infected herds. Thus, Simsek et al (2007) did not find any relationship between natural infection by F. hepatica and reproductive performance in adult dairy cows.…”

Assessment of prevalence of Fasciola hepatica and associated biochemical alterations in the cattle of Siirt province, Turkey

“…Sevimli et al (2005) conducted a post-slaughter study in the province of Afyonkarahisar and reported an F.hepatica prevalence of 4.6%. Simsek et al (2007) conducted a study in the province Elazığ where they utilized indirect-ELISA method and reported an F.hepatica prevalence of 60.5%. Yildirim et al (2007) conducted a study in the province of Kayseri and reported a seroprevalence of 65.2% for the disease.…”