Sean Crowley

Project Title: Joint genetic and genomic evaluations for sheep methane emissions between Ireland and New Zealand 

Overview: Sheep producers in New Zealand and Ireland operate predominately grass based, seasonal and export focused production systems. The similarities in production systems is also reflected in both the relative emphasis and traits included in both the New Zealand and Irish genetic indexes In addition both countries now have extensive breeding programmes focusing on the reduction of methane emissions in sheep. A high proportion of composite or crossbreed animals, with some overlap in the founder breeds in both populations, characterize the New Zealand and Irish sheep industry.

To date the feasibility of across-country predictions for methane emissions or indeed any performance traits has not been undertaken. International genetic evaluations allow for across-country genetic selection of breeding stock, which in turn can increase the rate of genetic gain achieved in comparison with within-country selection alone due to a higher selection intensity attained from the increased number of selection candidates.

The objectives of this PhD are to evaluate both the possibility and plausibility of sheep data from Ireland and New Zealand for use in an across-country genetic evaluation.

Sean is also currently engaged in research focused on investigating the correlations between methane emissions and performance traits in beef cattle. This work further contributes to our understanding of the intricate relationships between production traits and environmental impact, and how these insights can be utilized to inform sustainable livestock production practices.

Programme Area: Animal and Bioscience Department

Supervisors: Dr Nóirín McHugh, Dr Donagh Berry, and Dr Deirdre Purfield

Location: Teagasc Research Centre, Moorepark, Co. Cork

Funding Source: Teagasc