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Ph. D. Dissertation final2.pdf (2.01 MB)

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Use of Diverse Cattle Breeds to Understand Marbling Development and Growth for the Production of High-Quality Beef

Jaborek, Jerad R
http://rave.ohiolink.edu/etdc/view?acc_num=osu1574348508186835

Abstract Details

2019, Doctor of Philosophy, Ohio State University, Animal Sciences.
The first study investigates implementing a crossbreeding strategy on Jersey dairy farms, where a terminal beef sire would be mated to a proportion of the herd to increase the value of the male offspring compared with purebred Jersey steers. In general, crossbred Jersey cattle, sired by Angus, SimAngus, and Red Wagyu bulls, had a greater ADG and lesser G:F compared with purebred Jersey steers. As a result of the lesser ADG of purebred Jersey steers, they required the greatest amount of time on feed. Crossbred Jersey cattle achieved greater final body weights with fewer days on feed. Purebred Jersey cattle had a lesser backfat thickness, but deposited a greater percentage of kidney fat compared with crossbred Jersey steers. Crossbred Jersey cattle had a greater marbling score and USDA quality grade compared with purebred Jersey steers. The USDA YG equation did a poor job of predicting carcass cutability of all Jersey influenced cattle in this study. Overall, crossbred Jersey cattle had a greater boxed beef price and boxed beef value compared with purebred Jersey steers. Sire selection criteria for Jersey crossbreeding programs should focus on retail yield and should consider the use of growth enhancing technologies to increase muscle deposition. The second study was designed to further investigate marbling development in cattle. Wagyu and Angus sired cattle were compared at a similar age and days spent on feed or at a similar body weight endpoint to compare feedlot performance, carcass composition, and the expression of marbling related genes. Two Wagyu sires were used in this study, one selected for growth (LMR Fukutsuru 729T) and the other selected for marbling ability (OW Yasufuku 229Y). When compared at a similar age and days spent on feed, Angus sired cattle had a greater ADG, DMI, G:F, and off-test weight compared with Yasufuku sired cattle, while Fukutsuru sired cattle were similar to Angus sired cattle, except for having a lesser DMI. Yasufuku sired cattle had a greater marbling score and USDA QG compared with Angus sired cattle. When compared at a similar off-test body weight, Angus sired cattle had a greater ADG, DMI, and G:F, spent fewer days on feed, were younger at harvest, and had a lesser total DMI over the course of the entire study. Yasufuku sired cattle had a greater marbling score, USDA QG, and 6th rib fat thickness compared with Angus sired and Fukutsuru sired cattle. At both endpoint comparisons, Yasufuku sired cattle had a longissimus muscle fatty acid composition that was more desirable compared with Angus sired cattle, while Fukutsuru sired cattle were typically intermediate. Gene expression results may indicate two critical periods of intramuscular adipogenesis initiation at approximately 7 and 17 months of age. The upregulation of lipogenic genes was initiated around 12 months of age and peaked at 14 months of age. The gene expression results of Yasufuku sired cattle exhibited random peaks that may be responsible for preadipocyte proliferation compared with Angus and Fukutsuru sired cattle.
Alejandro Relling (Advisor)
Francis Fluharty (Advisor)
Lee Kichoon (Committee Member)
Moraes Luis (Committee Member)
Zerby Henry (Committee Member)
232 p.
Animal Sciences; Animals; Biology; Cellular Biology; Genetics; Nutrition
adipogenesis; beef cattle; feedlot; intramuscular fat; Jersey; marbling; Wagyu

Recommended Citations

Citations

  • Jaborek, J. R. (2019). Use of Diverse Cattle Breeds to Understand Marbling Development and Growth for the Production of High-Quality Beef [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574348508186835

    APA Style (7th edition)

  • Jaborek, Jerad. Use of Diverse Cattle Breeds to Understand Marbling Development and Growth for the Production of High-Quality Beef. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1574348508186835.

    MLA Style (8th edition)

  • Jaborek, Jerad. "Use of Diverse Cattle Breeds to Understand Marbling Development and Growth for the Production of High-Quality Beef." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574348508186835

    Chicago Manual of Style (17th edition)

osu1574348508186835
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This open access ETD is published by The Ohio State University and OhioLINK.