I really enjoyed listening to this Chute Side podcast with Dr. Ryan Rathmann on the definitions and nuances of line breeding vs. inbreeding. As a beef producer he favors cross breeding, but I got a lot of good take-aways for my registered/purebred Dexter breeding program. He talks about the benefits line breeding can add to your herd, such as uniformity in offspring. He also talks about challenges and down sides to line breeding, and how to avoid.
https://podcasts.apple.com/us/podcast/chute-side/id1468813469?i=1000474332264
