Many of you particularly if you keep a number of geese will run them with other livestock such as sheep or horses . If a combined worming programme is not used there can often occur a case of worm resistance in one of the breeds . As an example , if geese or ducks are kept with sheep , goats or cattle the larger species can be wormed and the wormer will cause them to shed parasite eggs . Many of these will be killed , the others are then picked up by the goose or duck and will pass through their system and later reinfect the host, this being a frequent cause of "worm resistance" . The smaller species may also suffer as they may be reinfected via the larger re distributing their own worm eggs.

The simplest way to treat this is to use the same wormer on both species and if the makers labels and dose ratings are followed (often with a calculator to reduce the dose from many kilo to one and a half!) . The option of adding a syringe to the mouth of individual geese is both time consuming and stressful to both owner and animals , a better method is to dilute the dose for the pen or pens and make up a wet mash or to soak the grain. Egg withdrawal for most makes is twenty four hours remembering that this is the day after worming as the eggs laid on the day of worming were produced during the previous day . (They can be added to food for growers but will not incubate).

Another problem is that vets are very keen to sell you the powdered wormer designed for chickens as each make of medicine  is meant to be tested for each species which is expensive. Few wormers are tested and sold for waterfowl so vets err  on the side of caution and sell chicken tested wormer which is for gape etc and takes a weeks worth of  applications. As geese and ducks do not get  gape etc as for a pet goat or sheep as all the same medicie then dilute according to weight instructions and give once