Grain feeding coordinately alters expression patterns of transcription factor and metabolic genes in subcutaneous adipose tissue of crossbred heifers.

摘要: The ability to improve meat quality and production efficiency in cattle is limited by an inability enhance marbling simultaneously limit undesirable adipose tissue accretion. objective of this study was examine expression regulatory genes subcutaneous (SCF) heifers response increasing days on feed (DOF) finishing strategy. Crossbred (n = 24) were allotted as follows: Group 1 0 d, 2 99 d winter annual ryegrass (grass; Lolium multiflorum Lam.), 3 218 g grass, 4 grass followed 119 grain. Adipose samples collected at time harvest frozen. Carcass characteristics measured 24 h postharvest. As expected, HCW (P < 0.0001), ribeye area (REA; P 0.0002), backfat (BF; KPH score 0.0009) increased with DOF though frame not different 0.95). Average daily gain decreased 0.0001). Yield grade 0.0014) but cook loss percentage 0.001) without changes 24-h pH 0.31). Interestingly, Warner-Bratzler shear force (WBS) 0.0089). Meanwhile, BF 0.01) 0.05) greater, whereas values trended greater grain versus grass-finished heifers. Neither ADG 0.89), 0.26), 0.85), nor REA 0.38) between these groups. Grain yield did affect 0.88), 0.98), or WBS 0.44) compared PPARγ, bone morphogenic protein (BMP2), SMAD family member (SMAD1) mRNA upregulated finishing, sterol element binding 1c (SREBP-1c), sonic hedgehog (SHH), chicken ovalbumin transcription factor (COUP-TF1), (COUP-TF2), preadipocyte factor-1 (PREF-1) finishing. These associated lipoprotein lipase (LPL), stearoyl-coenzyme A desaturase (SCD), fatty acid synthase (FAS) mRNA. In summary, improved gene studies suggest several novel are development growing cattle.