In this episode of The Feed Science Podcast Show, John McEwan, Principal Scientist retired at BSI AgResearch in New Zealand, explains how genetics and genomics are transforming ruminant production. He discusses breeding strategies that reduce methane emissions while improving feed efficiency and productivity in sheep and cattle systems. John highlights genomic selection, difficult-to-measure traits, and practical implementation at industry scale. Learn valuable insight for feed and nutrition professionals focused on sustainability and performance. Listen now on all major platforms!

“Selection lines now show about a twenty percent difference in methane output without compromising overall production performance.”

Meet the guest: John McEwan is a retired Principal Scientist at BSI AgResearch in New Zealand with more than four decades of experience in quantitative genetics, genomics, and bioinformatics. His work has focused on genomic selection, meat quality, feed efficiency, and breeding ruminants with lower methane emissions.

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What will you learn:

• (00:00) Highlight
• (01:05) Introduction
• (03:12) Methane breeding
• (07:42) Emission measurement
• (11:13) Feed impact
• (15:17) Rumen profiling
• (18:07) Productivity gains
• (22:28) Final Questions

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