Studies on Some Factors Affecting the Prevelance of Enteropathogens in Egyptian Calves
Abstract: ABSTRACT:
Whenever calves born, they are fight with virulent pathogens from their en¬vironment which threaten their life especially at early age. At this time the calves' immunity are not potential enough to save them. Various microorganisms are causing high morbidity and mortality rates in calves especially those agents that induce diarrhoeal syndromes at early age. Escherichia coli, Salmonella spp., Rotavirus and Cryptosporidium spp are numerated as the most common enteropathogens implicated as causes of infectious diarrhoea in calves.
The investigation was done over a 12-month period for estimation the sea¬sonal prevalence of different enteropathogens. Age-related prevalence and the correlation between blood IgG concentrations and the incidence of diar¬rhoea in calves in compare with normal calves.
The study revealed that the prevalence of E. coli, Salmonella spp, Rotavirus and Cryptosporidium in diarrhoeic calves was 86.5, 3.6, 29.9 and 11.6 %, respectively. The prevalence of E. coli infection was higher in all seasons as it ranged from 84.8 - 100 % in diarrhoeic calves, 72.1 - 100 % in non-diarrhoeic calves with no significant differences. Higher prevalence of Ro¬tavirus was reported in summer season (42.9 %) followed by in winter (33.7%) in diarrhoeic calves. In diarrhoeic calves, the higher prevalence of Salmonella and Cryptosporidium were reported during autumn and summer, respectively. Young calves (0-3 months old) experienced diarrhea more frequently than older animals. The diarrhoeic calves had partial failure of passive immunoglobulin transfer from colostrum since there was a significant difference in serum IgG levels between healthy and diarrheic groups at the first day of age.
In conclusion, recurrent surveys for the prevalence of enteropathogens helps the correction of vaccination regimens applied to overcome the out¬breaks enteric diseases in newborn calves. Keeping newborn calves healthy during their early life is a balance between passive immunity from colos¬trum and exposure to pathogens. Feeding colostrum is essential to the sur¬vival and health of newborn calves.
Publication year 2004
Availability location معهد بحوث التناسليات الحيوانية - 5 شارع حدائق الأهرام - الهرم - الجيزة
Availability number
Organization Name
Author(s) from ARC
Agris Categories Miscellaneous animal disorders
AGROVOC
TERMS		 Calves.
Publication Type Researsh & Applied Activities
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