This study aimed to compare single nucleotide polymorphism (SNP) effects associated with residual feed intake (RFI) during the first half, latter half, and total fattening periods in Japanese Black cattle. Residual feed intake for each period was obtained from 4,578 Japanese Black steers, which were progeny of 362 sires. The Illumina BovineSNP50 v2 BeadChip was used for genotyping of all sires. The SNP effects were estimated using a single-step genome-wide association study (ssGWAS). The results indicated that the magnitude of genetic variance in SNP windows differed for each fattening period. In addition, a RNA gene involved in the post-transcriptional regulation of gene expression was located near a significant effect SNP window associated with RFI in the first half of the fattening period. These results would facilitate better understanding of the physiological mechanism regulating feed efficiency in beef cattle. Keywords: ssGWAS, RFI, SNP effect, Japanese Black cattle

Masayuki Takeda, Yoshinobu Uemoto, Atsushi Ogino, Takayoshi Nozaki, Kazuhito Kurogi, Takanori Yasumori, Masahiro Satoh

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology - Feed Intake and Efficiency 2, , 199, 2018
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