AI Insight
Researchers identified a genetic variant in the SCD gene of farmed emus in Japan and examined its relationship to fat production and meat quality traits. While the genetic variant itself showed no significant association with fat yield, melting point, or fatty acid composition, higher expression levels of the SCD gene were associated with lower fat content and higher meat yield in the birds. Male emus with certain genotypes showed higher fat yields than females, but this pattern did not vary significantly within each sex across different genotypes.
Why it matters
This research provides initial genetic markers that could potentially aid selective breeding programs for emus, particularly for balancing meat and fat production. The findings about SCD gene expression could help farmers optimize emu production for either oil extraction or meat, though the specific genetic variant studied does not appear useful as a selection marker.
Understand the Science
by Yuichi Koshiishi, Suzuka Moriya, Yuki Ishida, Hiromitsu Ochiai, Kenta Wada
The emu is a novel poultry species producing meat, eggs, and fat. In particular, emu oil derived from the fat is considered the most important product of the emu owing to its anti-inflammatory and anti-melanin production. Meanwhile, there are few reports on the genetic improvement of economic traits in emus. In this study, we discovered a non-synonymous substitution (c.267A > C, p.Leu89Phe) in the gene encoding stearoyl-CoA desaturase (SCD), a key enzyme involved in unsaturated fatty acid synthesis, in a Japanese farmed emu population. Although fat yields (fat weight per body weight) in males with AA and AC genotypes of SCD were higher than those in their female counterparts, significant intra-sex variations were not detected across genotypes in our study population. Moreover, fat melting points and fatty acid composition did not significantly vary between SCD genotypes. These results suggest that the SCD c.267A > C polymorphism does not affect fat production traits in emus. However, the expression levels of SCD transcripts were negatively correlated with fat content (P < 0.01) and positively correlated with meat yield (P < 0.05) in emus.