Genomic prediction for feed efficiency: a validation of accuracy and its impact on methane emissions of dairy cows In 2015, the Feed Saved genomic breeding value was released in Australia. This breeding value was constructed using a genomic breeding value for residual feed intake (RFI) combined with an estimate of maintenance requirements. The objectives of this study were to evaluate the accuracy of the genomic prediction equation for RFI and to determine whether enteric methane emissions were reduced in more efficiency cows (low RFI). After correcting for the heritability, the accuracy of the genomic prediction equation for RFI was 0.35 and is consistent with that reported in the previous validation. The results also indicate that low RFI cows had significantly less methane production (471 vs 503 g/d) but not methane yield (19.3 vs. 18.6 g/kg of dry matter intake) and methane intensity (20.4 vs. 21.4 g/kg of milk). Keywords: Feed Saved, methane emissions, genomic selection, dairy cows

Phuong Ho

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Biology - Feed Intake and Efficiency 1, , 179, 2018
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