Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 122
Pathogenic causes of diarrhoea in cattle
ОглавлениеThese can be classified by pathogen, age of affected animal or another incidence pointer, as shown below in Table 3.1.
Table 3.1. Infectious causes of diarrhoea in cattle.
| Pathogen | Age group | Incidence pointer |
| Bovine viral diarrhoea | Adults | Abortion and linked to mucosal disease (see below) |
| Campylobacter jejuni and C. coli | Calves | Neonatal |
| Candida albicans | Calves | After prolonged antibiotic treatment |
| Coronavirus | Calves and adults | In adults, mainly in dairy cows in winter. Calves aged 3–21 days |
| Coccidiosis | Calves | 4–6 weeks of age |
| Cryptosporidiosis | Calves | 2–3 weeks of age |
| Enterotoxaemia | Calves | Neonatal, strains with K99 antigen are more pathogenic, may be peracute |
| Enterotoxaemia | Growing cattle | Clostridium perfringens type D, violent scouring |
| Fascioliasis | Yearlings and adults | Must have been grazing wet ground in the previous autumn |
| Johne’s disease | Adult cows over 3 years of age | Infected soon after birth |
| Mucosal disease | Yearlings | Always persistently infected (PI) |
| Necrotic enteritis | Suckler calves up to 4 months | Clostridium perfringens type C |
| Parasitic gastroenteritis | Yearlings or 2 year olds which have been turned out for the first time | At grass in late summer or autumn |
| Rotavirus | Calves | Neonatal high morbidity, low mortality |
| Type 2 Ostertagia ostertagia | Yearlings or 2 year olds which must have been out grazing in the previous late summer or autumn | January to March |
| Salmonellosis | Cows and calves | Salmonella typhimurium in calves, S. dublin in cows and calves |
