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Why dose cattle at this time of year? Cattle will have acquired both a gut worm and lungworm burden during the grazing season. Lungworm is the most significant parasite for Irish cattle being housed in the autumn. Lungworm cause the lungs to function less efficiently and makes them more susceptible to both viruses and bacteria at housing. Lungworm larvae and adults are killed and removed quickly after dosing, but it can take 2 to 3 weeks for the lung tissue to heal.
Would it not be better to treat lungworm infections while the weanlings are still at grass? They would be in a healthy outside environment and it would allow healing to occur without the challenges of dust, ammonia, viruses etc. This a Pre-Housing Dose (PHD). It is not an extra dose. There are wormers that have a persistent effect against both lungworm and stomach worms. Cattle that receive a PHD with Dectomax and are dosed within 5 weeks of housing, do not require another worm dose at housing.
Advantages of a Pre-Housing Dose;