Problem: Serious worm problems arise because
Solution: Zero-grazing or feedlotting prevents your goats from becoming infected with worms.
If goats already receive a lot of supplementary feed, e.g. hay and grain daily and/or they are milking goats that are kept to produce milk for sale, then well designed goat yards and feeders can solve goat worm problems.
There must be absolutely no grazing or no grass in the yards and the feeders must be designed so that no manure contamination of the feed is possible. Feeders must also prevent goats’ feet from contaminating feed as dirty hooves can transfer worm eggs or larvae. Fence-line feeders like those shown in Figure 1 are ideal.
When bringing goats into a feedlot, where possible, give them a quarantine drench to remove existing worms. If this is not possible, such as with dairy goats producing milk for human consumption, roundworms in the goats will eventually die over many months. However, liver fluke can live for some years.
If worms remain in the goats in a feedlot, worm eggs will be produced. These eggs may successfully hatch in the feedlot area if there is sufficient warmth and moisture (just as if they were in the paddock), but without pasture plants for the larvae to wriggle onto, very few larvae will be ingested by the goats.
Even without the use of drenches, the number of worms will decline until they are negligible or disappear completely.
It is recommended that after goats are inducted into the feedlot with a quarantine drench, that you conduct a WormTest 14 days later.
Dairy goats that are drenched must have their milk disposed of in a manner that does not allow for human consumption for the required withholding times stipulated by the label or veterinarian’s prescription. This is a significant economic cost if milk is being sold that could help fund the additional feed costs to compensate for the lost grazing.
Feedlots can be small and low cost as long as feeders are well designed.
For feedlots to work there must be no grass at all. Grass should be killed with chemicals and then gravel, pine-bark or similar materials can be added to muddy areas. Special attention should be paid to areas around water troughs, as small amounts of grass can grow around them and can become heavily contaminated with worm larvae and can also present an increased risk of coccidiosis.
Play equipment should be provided in the feedlot area to encourage exercise.
Feedlots should be cleaned out regularly and the old hay and manure composted in an area where drainage does not go back into the feedlot or onto browse or crops that will be cut for goats.
Previous pasture areas that will no longer be needed can be planted to fodder crops or permanent browse plants such as leucaena, mulberry, hibiscus, tree lucerne or bamboo for cutting for backyard goats.
Any feed to be used in the feedlot should be free of worm larvae. Green chop and cut pasture that has been grazed by sheep or goats in the 6 months before it was cut is likely to be contaminated by worm larvae. Hay and chaff is generally suitable.
If browse or fodder crop is cut from above half a metre height there should be no worm larvae as few larvae can wriggle up to above 20 cm.