- M.S. Agriculture, Stephen F. Austin State University, in progress
- B.S. Agriculture, Stephen F. Austin State University
Drs. E.G. Brown, G. E. Carstens, J. M. Mehaffey, J. L. Bray, D. Perritt
Phenotypic Relationship Between Residual Feed Intake ad Ultrasound Carcass Traits in Santa Gertrudis Steers
The objectives of this study were to characterize residual feed intake (RFI) in feed efficiency, carcass, and temperament traits. For this study, two trials were conducted with Santa Gertrudis steers, trial 1 (n = 115) and trial 2 (n = 118) during which steers were fed a roughage-based diet (2.1 Mcal ME/kg DM) during the growing phase, and a high-grain diet (3.0 Mcal ME/kg DM) during the finishing phase. Steers were weighed at 14-day intervals and DMI measured (Calan gate or GrowSafe) for 70 days during both the growing and finishing phases. Residual feed intake (RFI) was calculated as the difference between actual dry matter intake (DMI) and DMI predicted from linear regression of DMI on mid-test metabolic BW. Ultrasound measurements of the 12th rib fat thickness (BF), longissimus muscle area (REA), and percentage intramuscular fat (IMF) were measured on day 0 and 70 of the growing and finishing phases. Steers were slaughtered after the finishing phase at 1.0 cm of BF and carcass cooler traits were measured. Temperament traits were also measured at the start and end of each feeding period.
Publications and Presentations
Research Poster - Presented at the July 2016 meeting of the Journal of Animal Science
Research Poster - Presented at the 2016 Stephen F. Austin State University Graduate Research Conference