Does the methane-mitigating feed additive 3-nitrooxypropanol affect additive genetic variance and ranking of methane and yield traits in Holstein dairy cows?

Key Points

• The aim is to quantify how the feed additive 3-NOP influences genetic parameters and G × E interactions related to methane emissions and production traits.
• Quantitative analysis of genetic traits related to methane emissions and milk yield in Holstein dairy cows.
• Assessment of potential G × E interactions prompted by 3-NOP treatment.
• No significant effect was found on additive genetic variance for methane emissions and yield traits.
• The G × E interactions were minimal, indicating that the feed additive did not markedly alter genetic rankings.