1. Rogers JA, Branine ME, Miller CR, et al. Effects of dietary virginiamycin on performance and liver abscess incidence in feedlot cattle. J Anim Sci 1995; 73:9–20.
2. Montano MF, Manriquez OM, Salinas-Chavira J, Torrentera N, Zinn RA. Effects of monensin and virginiamycin supplementation in finishing diets with distiller dried grains plus solubles on growth performance and digestive function of steers. J Appl Anim Res 2014; 43:417–25.
3. Salinas-Chavira J, Lenin J, Ponce E, Sanchez U, Torrentera N, Zinn RA. Comparative effects of virginiamycin supplementation on characteristics of growth performance, dietary energetics, and digestion of calf-fed Holstein steers. J Anim Sci 2009; 87:4101–8.
4. Salinas-Chavira J, Barreras A, Plascencia A, et al. Influence of protein nutrition and virginiamycin supplementation on feedlot growth performance and digestive function of calf-fed Holstein steers. J Anim Sci 2016; 94:4276–86.
5. NRC. Nutrient requirements of beef cattle. 7th rev. edWashington, DC: National Academy Press; 2000.
6. NRC. Nutrient requirements of beef cattle. 6th rev. edWashington, DC: National Academy Press; 1984.
7. Zinn RA, Shen Y. An evaluation of ruminally degradable intake protein and metabolizable amino acid requirements of feedlot calves. J Anim Sci 1998; 76:1280–9.
8. USDA. United States Standards for Grading of Carcass Beef. Washington, DC: Agricultural Marketing Service, USDA; 1997.
9. Murphey CE, Hallett DK, Tyler WE, Pierce JC. Estimating yields of retail cuts from beef carcasses. In : Presented at the 62nd Meeting of the American Society of Animal Production; Chicago. November 26, 1960.
10. Zinn RA, Plascencia A. Interaction of whole cottonseed and supplemental fat on digestive function in cattle. J Anim Sci 1993; 71:11–7.
11. Zinn RA. Comparative feeding value of supplemental fat in finishing diets for feedlot steers supplemented with and without monensin. J Anim Sci 1988; 66:213–27.
12. Bergen WG, Purser DB, Cline JH. Effect of ration on the nutritive quality of rumen microbial protein. J Anim Sci 1968; 27:1497–501.
13. AOAC. Official methods of analysis. 14th edArlington, VA: AOAC International; 1984.
14. Goering HK, Van Soest PJ. Forage fiber analyses (apparatus, reagents, procedures, and some applications). Washington, DC: Agric Handbook No. 379ARS-USDA: 1970.
15. Hill FN, Anderson DL. Comparison of metabolizable energy and productive energy determinations with growing chicks. J Nutr 1958; 64:587–603.
16. Zinn RA, Owens FN. A rapid procedure for purine measurement and its use for estimating net ruminal protein synthesis. Can J Anim Sci 1986; 66:157–66.
17. Zinn RA. Influence of flake density on the comparative feeding value of steam-flaked corn for feedlot cattle. J Anim Sci 1990; 68:767–75.
18. Orskov ER, MacLeod NA, Kyle DJ. Flow of nitrogen from the rumen and abomasum in cattle and sheep given protein-free nutrients by intragrastric infusion. Br J Nutr 1986; 56:241–8.
19. Wolin MJ. A theoretical rumen fermentation balance. J Dairy Sci 1960; 43:1452–9.
20. Zinn RA, Barreras A, Owens FN, Plascencia A. Performance by feedlot steers and heifers: daily gain, mature body weight, dry matter intake, and dietary energetics. J Anim Sci 2008; 86:2680–9.
21. Salinas-Chavira J, Alvarez E, Montaño MF, Zinn RA. Influence of forage NDF level, source and pelletizing on growth performance, dietary energetics, and characteristics of digestive function for feedlot cattle. Anim Feed Sci Technol 2013; 183:106–15.
22. Thom EC. The discomfort index. Weatherwise 1959; 12:57–9.
23. NOAA (National Oceanic and Atmospheric Administration). Livestock hot weather stress. Operations manual Letter C-31-76Kansas City, MO, USA: NOAA; 1976.
24. Mader TL, Davis MS, Brown-Brandl T. Environmental factors influencing heat stress in feedlot cattle. J Anim Sci 2006; 84:712–9.
26. Zinn RA. Influence of forage level on response of feedlot steers to salinomicyn supplementation. J Anim Sci 1986; 63:2005–12.
27. Zinn RA, Plascencia A, Barajas R. Interaction of forage level and monensin in diets for feedlot cattle growth performance and digestive function. J Anim Sci 1994; 72:2209–15.
28. Calderon-Cortes JF, Zinn RA. Influence of dietary forage level and forage coarseness of grind on growth performance and digestive function in feedlot steers. J Anim Sci 1996; 74:2310–6.
30. Carrasco R, Arrizon AA, Plascencia A, Torrentera NG, Zinn RA. Comparative feeding value of distillers dried grains plus solubles as a partial replacement for steam-flaked corn in diets for calf-fed Holstein steers: characteristics of digestion, growth performance, and dietary energetics. J Anim Sci 2013; 91:1801–10.