The main worm challenges for grazing animals.1,2
Immunity to worms2
Cattle naturally acquire immunity to gut and lungworms while grazing. This immunity is maintained by continual exposure while at pasture.
Immunity develops after one to two months for lungworm, three to six months (one grazing season) for Cooperia while exposure over two grazing seasons is required to develop immunity to Ostertagia.
Overwintered larvae die off as they run out of energy(a). Calves faced with a low-moderate challenge produce increasing numbers of eggs from 3 weeks after infection. Pasture larval numbers increase rapidly from July onwards(b) (exact timing weather dependent).
Two doses of Dectomax, the first at turn out, the second eight weeks later, effectively manages gut worm burdens in the animal and on the pasture, giving optimum growth rates while allowing some exposure to worms to stimulate immunity.3
Lungworm risk is weather dependent but is generally highest from July to housing.1 Pre housing treatment with Dectomax (up to 5 weeks before housing) can manage this risk and also remove inhibited Ostertagia to control the risk of Type II Ostertagiasis in late winter.