Sheep being treated with drench© Mint Images/REX/Shutterstock
The spring rise is a relaxation in the immunity of the ewe around the period of lambing. This results from changes in the immune status of the ewe, leading to increased egg production by female roundworms and maturation of arrested larvae. Zoetis vet Dave Armstrong explains more about it and how it can be controlled in this short Q&A.  When is the risk period? From about two weeks before lambing until about six weeks after lambing. The period of increased […]