Bovine PGE

Bovine PGE

1. Bovine parasitic gastroenteritis

   • nematode species
   • characteristics
     • diarrhoea/weight
     • less than optimum productivity
     • seasonal appearance
     • hypoalbuminanaemia
   • CONSIDERABLE ECONOMIC IMPORTANCE TO LIVESTOCK INDUSTRY

2. Worm species in bovine intestinal tract

   • Ostertagia ostertagi = most important

3. Life cycle

   • direct
   • non migratory
   • calves infected by ingesting L3 with grass
     • develop on abomasal gastric gland to L4 stage
       • strongyle eggs produced
         • passed out in faeces
   • larvae swallowed

4. PPP - 3 WEEKS

   • If arrested at L4 - 5-6 MONTHS

5. Control

   • TYPE 1
     • clean pasture
     • delay turnout until after spring mortality of L3
     • dose and move to aftermath in mid July
     • if not alt grazing - repeated anthelmintic treatment
       • monthly from mid july
   • TYPE 2
     • cattle exposed to low challenge in late autumn - unlikely to req treatment
     • cattle exposed to med/high challenge in late autumn likely to req treatment at housing