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Bovine QTL analysis for growth, carcass, and meat quality traits in an F2 population from a cross between Japanese Black and Limousin

T. Abe^*, J. Saburi^*, H. Hasebe^*, T. Nakagawa^*, T. Kawamura, K. Saito, T. Nade^*, S. Misumi^*, T. Okumura^*, K. Kuchida, T. Hayashi^#, S. Nakane^*, T. Mitsuhasi^*, K. Nirasawa^*, Y. Sugimoto¹ and E. Kobayashi^*

^* National Livestock Breeding Center, Nishigo, Fukushima 961-8511, Japan , Tokachi Branch of National Livestock Breeding Center, Otofuke, Hokkaido 080-0572, Japan , Ohu Branch of National Livestock Breeding Center, Shichinohe, Aomori 039-2567, Japan , Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan , ^# National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan ¹ Shirakawa Institute of Animal Genetics, Nishigo, Fukushima 961-8061, Japan

t0abe{at}nlbc.go.jp

Abstract

A genome-wide scan for QTL affecting economically important traits in beef production was performed using an F2 resource family from a Japanese Black x Limousin cross, where 186 F2 animals were measured for growth, carcass, and meat-quality traits. All family members were genotyped for 313 informative microsatellite markers, which spanned 2,382 cM of bovine autosomes. The centromeric region of BTA 2 contained significant QTL (that is, exceeding the genome-wide 5% threshold) for 5 carcass grading traits (Musculus [M.] longissimus area, beef marbling standards (BMS) number, luster, quality-grade, and firmness), 8 computer image analysis (CIA) traits (M. longissimus lean area, ratio of fat area (RFA) to M. longissimus area, M. longissimus area, RFA to M. trapezius area, M. trapezius lean area, M. semispinalis lean area, RFA to M. semispinalis area, and RFA to M. semispinalis capitis area), and 5 meat quality traits (crude protein content, crude fat content, moisture content, C16:1 and C18:2 content of M. longissimus). A significant QTL for withers height was detected at 80.3 cM on BTA 5. We detected significant QTL for the C14:0 content in backfat and C14:0 and C14:1 content in intermuscular fat around the 62.3- to 71.0-cM region on BTA 19 and for C14:0, C14:1, C18:1, and C16:0 content and US/S (ratio of total unsaturated fatty acid content to total saturated fatty acid content) in intramuscular fat at 2 different regions on BTA 19 (41.1 cM for C14:1 and 62.3 cM for the other 4 traits). Overall, we identified 9 significant QTL regions controlling 27 traits with genome-wide significance of 5% , and of these, 22 traits exceeded the 1% genome-wide threshold. Some of the QTLs affecting meat quality traits, detected in this study might be the same QTLs as previously reported. The QTLs we identified need to be validated in commercial Japanese Black cattle populations.

Key Words: bovine • F2 family • meat quality • quantitative trait loci

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