40 years of sheep selection lessons: worm resistance, longevity and performance with Allan Richardson

Head Shepherd

Head Shepherd
40 years of sheep selection lessons: worm resistance, longevity and performance with Allan Richardson
Feb 22, 2026 Season 2026 Episode 271
Mark Ferguson

How much do you hate daggy sheep? Well, what started as a frustration with daggy sheep ended up reshaping this week's guest’s entire farming system.

This week, Allan Richardson explains how his determination to eliminate daggy sheep ultimately led to three decades of organic farming and the adoption of regenerative principles.

He began by wanting to select for low dag score, but a local vet encouraged him to focus instead on worm resistance. Selecting for worm resistance made organic certification achievable. From there, Organic farming opened the door to regenerative principles focused on soil biology and long-term system health.

Farming inland from Dunedin in a summer wet climate, Allan shares his wisdom from nearly 40 years of selection for worm resistance, resilience, short tails and longevity. 

Head Shepherd is brought to you by neXtgen Agri International Limited.

We help livestock farmers get the most out of the genetics they farm with. Get in touch with us if you would like to hear more about how we can help you do what you do best: info@nextgenagri.com.

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