29 - Parasite Control in Ruminants

Benzimidazoles

What anhelmintic group is also called the white wormers, and includes fenbendazole, albendazole, and oxfendazole?

Yes

Is resistance found in all major nematode species of all livestock?

Goat

In which animal is anthelmintic resistance the most serious?

Refugia

Reducing the pressure of selecting an anthelmintic can be done by managing what? It refers to the proportion of the worm population that is not selected by drug treatment, such as worms in untreated animals and worm stages on pasture at the time of treatment. It provides a means of maintaining a majority of drug-sensitive worms.

No

Is rotation an effective method of using anthelmintics?

Combination

Is it more effective to use anthelmintics in rotation or combination (sequentially)?

FECRT

What test is done to determine which anthelmintics to use? It determines which drugs are effective on that farm and which are partially effective. Any drugs yielding 35-50% reduction could be included in an effective combination.

No

Are new anthelmintic classes likely an effective solution for overcoming the resistance problem?

Yes

Is it normal and natural for livestock to be infected with parasites?

20-30

About what percentage (range) of animals in a herd contain 80% of the total parasites? Except for very young animals most of them develop good protective immunity from parasites.

No

Do otherwise healthy livestock with low to moderate worm burdens require deworming to remain healthy? It does not significantly improve health/welfare in most of the herd.

Yes

Will animals on a poor nutritional plane lose the immunity they had gained to parasites?

Increase

Do modern husbandry practices like forced grazing and fencing increase or decrease the rate of parasite transmission?

No

Do animals eating with their heads up (browsers) ingest worm larva?

Oral

What route of anthelmintic administration is the only one that should be used in sheep and goats?