Science over tradition: moving towards evidence-based and sustainable…

Presented by John Gilleard, BVSc, PhD, Dipl. ACVM, Dipl. EVPC, FCAHS, FRCVS

Continuing education questionnaire

CE credit: 1

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Questions

1. Which of the following statements is the MOST ACCURATE concerning refugia-based approaches that aim to slow the emergence of anthelmintic resistance in gastrointestinal nematode parasites in beef cattle? *

A good approach would be to use fecal egg counts (FECS) to choose which individual animals to treat

A good approach would be to only treat ~10%–20% of animals in the group

A good approach would be to leave ~10%–20% of animals in the group untreated

A good approach would be to treat all individuals in the group, but then move them immediately to another pasture

2. Which of the following statements is the MOST ACCURATE regarding the use of FECs to inform gastrointestinal nematode control in beef cattle? *

The detection of any strongyle eggs in fecal samples suggests an anthelmintic treatment is likely to be beneficial

A mean group fecal egg count of above 5 epg suggests an anthelmintic treatment is likely to be beneficial

Fecal samples should be taken per rectum and not off the ground when conducting fecal egg counts

There is not simple threshold value for a FEC to determine the need for anthelmintic treatment

3. Which of the following statements is the MOST ACCURATE regarding the collection and storage of FECS in beef cattle? *

You should sample at least 4 animals in a group

You should sample at least 20 animals per group

Pooling of individual fecal samples during collection and prior to sending to the lab is a good idea to make the monitoring of parasite burdens economically feasible

Fecal samples are best stored in a freezer until they are ready to process or be shipped to the lab

4. There is effectively no transmission of gastrointestinal nematodes to cattle within feedlot yards. *

True

False

5. Generally, there is no survival of cattle gastrointestinal nematode infective L3 larvae over the winter on western Canadian pastures due to low temperatures and freezing. *

True

False

6. Although it is now recognized as a problem in the US, it is not yet known if anthelmintic resistance is an issue for gastrointestinal nematodes of beef cattle in Canada. *

True

False

7. Which of following statements is the MOST ACCURATE regarding subclinical production impacts of gastrointestinal nematodes in Canadian beef cattle? *

Gastrointestinal nematode burdens are very rarely sufficient to cause production impacts in beef stocker cattle in Canada

Gastrointestinal nematode burdens are almost always sufficient to cause production impacts in beef stocker cattle in Canada

Production impacts caused by gastrointestinal nematodes varies a lot between different beef stocker cattle herds and different years in Canada

Production impacts caused by gastrointestinal nematodes are only seen in young cattle at pasture and not in feedlots in Canada

8. Which of the following statements is the MOST ACCURATE regarding the use of anthelmintics to control gastrointestinal nematodes in Canadian beef cattle? *

Current evidence suggests there is widespread resistance in species to macrocyclic lactones (ivermectin) in Canadian beef herds

Current evidence suggests there is widespread resistance in Cooperia species to benzimidazoles (fenbendazole/albendazole) in Canadian beef herds

Using macrocyclic lactone (ivermectin) pour-on in the fall is a highly effective way to control both internal roundworms and ectoparasites

To assess the effectiveness of anthelmintic treatments in beef cattle, fecal egg counts should be taken at the time of treatment and again approximately 5 days after treatment.

9. Which of the following would be considered GOOD PRACTICE in order to slow the development of anthelmintic resistance? *

Sequential application of 2 anthelmintics belonging to different drug classes but targeting the same parasite species

Sequential application of 2 anthelmintics belonging to the same drug class and targeting the same parasite species

Sequential application of 2 anthelmintics of different drug classes, but targeting different parasite species

Mixing 2 different anthelmintic products together prior to their application

10. In western Canada, it is unlikely there will be any viable gastrointestinal nematode infective larvae remaining on a pasture by about 8 weeks following removal of grazing cattle in the late summer. *

True

False