ALPHARMA Beef Cattle Symposium: Factors Affecting Feedlot Profitability
نویسندگان
چکیده
vide data on ruminal pH (pH = 6.21 ± 0.34), liquid outflow rate (LOR = 12.1 ± 4.0 L/kg DM), and ruminally digested OM (rdOM = 39.5 ± 10.3 % DM). The LOR is an index of buffer recycling/kg DMI and rdOM is an index of VFA production/kg DMI. The compliled data also included dry matter intake (DMI = 2.81 ± .87 % LW) and Acetate/Propionate ratio (A/P = 3.18 ± 0.89). Data were analyzed using GLM procedure to separate variances among and within experiment. On 52 experiments and 132 treatments when ruminal pH was compared to rdOM, there was no significant relationship among or within the diets. In contrast, the small regression standard deviation (rsd) indicated that ruminal pH was fairly accurately explained within diets by LOR: pH = 4.90 + 0.15(LOR) 0.003(LOR2); n = 86, nexp = 35, rsd = 0.09. With the A/P ratio, another index of ruminal perturbation, there was a curvilinear relationship with rdOM: A/P = -0.59 + 0.50(rdDOM) 0.011(rdOM2); n = 79, nexp = 32, rsd = 0.46. However, the corresponding relationship was more accurate with LOR: A/P = 0.57 + 0.52(LOR) 0.014(LOR2); (n = 75, nexp = 30, rsd = 0.30). In conclusion, this summary of published research indicates that perturbations in ruminal pH and A/P are related more to LOR, which is linked to diet fibrosity indexes and chewing activity, than to differences in dietary variation linked to rdOM.
منابع مشابه
Alpharma Beef Cattle Nutrition symposium: alternative energy sources for beef cattle finishing diets.
The Alpharma Beef Cattle Nutrition symposium was held at the joint annual meeting of the American Society of Animal Science, the American Dairy Science Association, and the Canadian Society of Animal Science in Montreal, Quebec, Canada, July 12 to 16, 2009. The symposium was organized to discuss the increased incorporation, challenges, and management options when alternative energy sources are ...
متن کاملAlpharma Beef Cattle Nutrition Symposium: parameterizing health and performance expectations of feedlot cattle.
J. Anim. Sci. Vol. 88, E-Suppl. 2/J. Dairy Sci. Vol. 93, E-Suppl. 1/Poult. Sci. Vol. 89, E-Suppl. 1 49 Practical relationships between morbidity and growth performance. V. R. Bremer1, G. E. Erickson*1, T. J. Klopfenstein1, D. R. Smith1, K. J. Hanford1, R. E. Peterson2, L. O. Burciaga-Robles2, D. B. Faulkner3, and C. R. Krehbiel4, 1University of Nebraska, Lincoln, 2Feedlot Health Management Serv...
متن کاملALPHARMA BEEF CATTLE NUTRITION SYMPOSIUM: Implications of nutritional management for beef cow-calf systems1
متن کامل
Effects of Soybean Hulls, Wet Brewer’s Grain or a Combination Supplement on the Performance of Forage-fed Steers during Backgrounding
supplementation scenarios. Introduction Backgrounding of cattle is generally utilized to prepare the calf for subsequent segments of the beef cattle industry. Cravey (1996) suggested that backgrounded calves may demonstrate greater feedlot profitability as a result of greater feedlot ADG, gain:feed, decreased medicinal cost and mortality compared to nonbackgrounded cattle. Step et al. (2008) in...
متن کاملAlpharma Beef Cattle Nutrition symposium: manipulation of nutrient synchrony.
The Alpharma Beef Cattle Nutrition symposium was held at the joint annual meeting of the American Society of Animal Science, the American Dairy Science Association, the Asociación Mexicana de Producción Animal, and the Poultry Science Association in San Antonio, Texas, July 8 to 12, 2007. The purpose of the symposium was to discuss the potential to influence ruminant animal production through n...
متن کامل