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Performance, residual feed intake, digestibility, carcass traits, and profitability of Angus-Hereford steers housed in individual or group pens.
J Anim Sci 2010; 88(1):324-9JA

Abstract

Even though the concept of residual feed intake (RFI) is well accepted, several questions remain regarding other traits that may be associated with selection for decreased RFI. These include DM digestibility, carcass composition, profitability, and performance. The objective of this study was to investigate the difference in those traits between low- and high-RFI cattle. Sixty Angus x Hereford crossbred steers (296 kg of initial BW) were fed a corn-based finishing ration (1.68 Mcal of NE(m)/kg, 13% CP on a DM basis) during 2 periods of 60 d each. For both phases, the regression equation fitted without the intercept (not statistically significant) was DMI (kg/d) = 0.0701 x BW(0.75) + 2.714 x ADG, r(2) = 0.42. The 15 greatest and least RFI steers were classed as high and low RFI groups. There were no differences between low and high RFI groups for days on feed (162 vs. 168 d), slaughter weight (503 vs. 511 kg), HCW (317 vs. 315 kg), LM area (76.5 vs. 77.1 cm(2)), backfat (1.23 vs. 1.27 cm), KPH (3.1 vs. 3.7%), quality grade (average Choice for both groups), or carcass fat (32.4 vs. 33.1%). Visceral organ masses and abdominal fat were similar for low and high RFI groups (32.25 vs. 31.24 kg and 37.48 vs. 36.95 kg, respectively). These results do not support the existence of major differences in composition and organ mass between low and high RFI steers at slaughter. The RFI grouping had a significant effect on DMI, G:F, and RFI values. Stepwise regression showed that G:F alone or DMI and ADG together explained 98.5% of the variance in cost of BW gain, whereas RFI alone explained only 18%. We conclude that RFI is less useful than G:F as an indicator of feedlot efficiency and profitability.

Authors+Show Affiliations

Department of Animal Science, University of California, Davis 95616, USA. rdsainz@ucdavis.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

19749019

Citation

Cruz, G D., et al. "Performance, Residual Feed Intake, Digestibility, Carcass Traits, and Profitability of Angus-Hereford Steers Housed in Individual or Group Pens." Journal of Animal Science, vol. 88, no. 1, 2010, pp. 324-9.
Cruz GD, Rodríguez-Sánchez JA, Oltjen JW, et al. Performance, residual feed intake, digestibility, carcass traits, and profitability of Angus-Hereford steers housed in individual or group pens. J Anim Sci. 2010;88(1):324-9.
Cruz, G. D., Rodríguez-Sánchez, J. A., Oltjen, J. W., & Sainz, R. D. (2010). Performance, residual feed intake, digestibility, carcass traits, and profitability of Angus-Hereford steers housed in individual or group pens. Journal of Animal Science, 88(1), pp. 324-9. doi:10.2527/jas.2009-1932.
Cruz GD, et al. Performance, Residual Feed Intake, Digestibility, Carcass Traits, and Profitability of Angus-Hereford Steers Housed in Individual or Group Pens. J Anim Sci. 2010;88(1):324-9. PubMed PMID: 19749019.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Performance, residual feed intake, digestibility, carcass traits, and profitability of Angus-Hereford steers housed in individual or group pens. AU - Cruz,G D, AU - Rodríguez-Sánchez,J A, AU - Oltjen,J W, AU - Sainz,R D, Y1 - 2009/09/11/ PY - 2009/9/15/entrez PY - 2009/9/15/pubmed PY - 2010/3/10/medline SP - 324 EP - 9 JF - Journal of animal science JO - J. Anim. Sci. VL - 88 IS - 1 N2 - Even though the concept of residual feed intake (RFI) is well accepted, several questions remain regarding other traits that may be associated with selection for decreased RFI. These include DM digestibility, carcass composition, profitability, and performance. The objective of this study was to investigate the difference in those traits between low- and high-RFI cattle. Sixty Angus x Hereford crossbred steers (296 kg of initial BW) were fed a corn-based finishing ration (1.68 Mcal of NE(m)/kg, 13% CP on a DM basis) during 2 periods of 60 d each. For both phases, the regression equation fitted without the intercept (not statistically significant) was DMI (kg/d) = 0.0701 x BW(0.75) + 2.714 x ADG, r(2) = 0.42. The 15 greatest and least RFI steers were classed as high and low RFI groups. There were no differences between low and high RFI groups for days on feed (162 vs. 168 d), slaughter weight (503 vs. 511 kg), HCW (317 vs. 315 kg), LM area (76.5 vs. 77.1 cm(2)), backfat (1.23 vs. 1.27 cm), KPH (3.1 vs. 3.7%), quality grade (average Choice for both groups), or carcass fat (32.4 vs. 33.1%). Visceral organ masses and abdominal fat were similar for low and high RFI groups (32.25 vs. 31.24 kg and 37.48 vs. 36.95 kg, respectively). These results do not support the existence of major differences in composition and organ mass between low and high RFI steers at slaughter. The RFI grouping had a significant effect on DMI, G:F, and RFI values. Stepwise regression showed that G:F alone or DMI and ADG together explained 98.5% of the variance in cost of BW gain, whereas RFI alone explained only 18%. We conclude that RFI is less useful than G:F as an indicator of feedlot efficiency and profitability. SN - 1525-3163 UR - https://www.unboundmedicine.com/medline/citation/19749019/Performance_residual_feed_intake_digestibility_carcass_traits_and_profitability_of_Angus_Hereford_steers_housed_in_individual_or_group_pens_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/jas.2009-1932 DB - PRIME DP - Unbound Medicine ER -