1. St. Croix Sheep Have the Highest Parasite Resistance
Several university and agricultural researchers have done comparison studies through fecal parasite egg counts and found
that St. Croix Sheep seem to have the ability to resist parasite life cycles.
Dr. Joan Burke of the Boonesville Arkansas Research Station suggests not using worm medicines on St. Croix Hair Sheep unless there is a loss of body condition.
In another study conducted by Gamble and Zajac for the Agricultural Research Service of the USDA and Virginia Tech,
the scientists found that St. Croix “demonstrated high levels of acquired resistance to Haemonchus contortus under conditions of experimental or natural infection.”
Trichostrongyles of gastrointestinal parasites are one of the most common constraints in sheep production worldwide.