0589 Feedlot performance and diet digestibility of feed efficiency - ranked beef steers fed corn or roughage - based diets and finished with corn or byproduct - based diets
نویسندگان
چکیده
The objective was to determine effects of growing phase (GP) diet and feed efficiency (FE) ranking, as well as finishing phase (FP) diet, on beef steer diet digestibility and FP growth. At University of Missouri, 193 steers were fed whole-shell corn (GPC) or roughage-based (GPR) diets using GrowSafe individual feed intake system for 70 d and FE was determined. At Iowa State University, the 12 greatest (HFE) and 12 least (LFE) feed efficient steers from each GP diet (n = 48; 509 ± 7 kg) were blocked by GP diet and FE ranking into GrowSafe-equipped pens of six. Steers were fed 10 g titanium dioxide (TiO2) daily in diets similar to GP diets for 14 d, followed by 2 d fecal collection to determine GP diet DM digestibility (GPdig). Steers were then transitioned to FP corn (FPC) or byproduct-based diets (FPB), receiving FP diets for 14 d before again being fed TiO2 daily for 14 d followed by 2 d fecal collection to determine FP diet DM digestibility (FPdig). Data were analyzed using PROC MIXED of SAS. There was a tendency for greater (P = 0.07) GPdig in HFE versus LFE steers, and FPdig was greater (P < 0.05) for steers fed FPC versus FPB diets. There was no relationship between FPdig and finishing phase G:F. There was a positive correlation between G:F in GP and FP (R = 0.29; P < 0.05). A positive correlation between GPdig and FPdig (R = 0.31; P < 0.05) was driven by a strong positive correlation between GPdig and FPdig (R = 0.71, P < 0.05) in cattle grown and finished on corn diets. Compared to LFE, HFE steers had greater finishing phase G:F (P < 0.05) and tended to have greater FP final BW and ADG (P = 0.07), while DMI did not differ due to FE rank (P > 0.1). No differences in ADG, G:F, or DMI (P > 0.1) during FP were noted due to GP or FP diet effects. In this study, G:F during FP was positively related to growing phase FE ranking, and FP performance was greater in steers ranked as highly FE during GP. Differences in GPdig may help explain growing phase FE ranking. The strong correlation for diet digestibility in steers grown and finished on corn diets supports the assertion that cattle FE testing should likely be conducted using the diet most similar to the environment of interest.
منابع مشابه
Growth and Carcass Characteristics of Feed Efficiency Classified Cattle Fed Corn or Roughage-Based Diets and Finished with Corn or Byproduct-Based Diets
and Implications The current study is part of a five-year multidisciplinary grant aiming to identify dietary, genotypic and metabolic factors affecting feed efficiency while additionally analyzing the effects of feed efficiency differences on feedlot performance and carcass characteristics. The current report summarizes the six groups of steers fed over five years. Feed efficiency was relativel...
متن کاملManipulating grain processing method and roughage level to improve feed efficiency in feedlot cattle.
The effects of feeding finishing diets containing whole corn with no roughage on performance and carcass characteristics of feedlot steers were evaluated in 6 trials conducted at commercial research facilities (Bos Technica Research Services Inc., Salina, KS) in the Southern Plains of the United States. One hundred and two feedlot pens containing 6,895 steers were represented. All trials were d...
متن کاملEffects of wet corn gluten feed and roughage levels on performance, carcass characteristics, and feeding behavior of feedlot cattle.
Two experiments were conducted to evaluate the effects of feeding different levels of wet corn gluten feed (WCGF) and dietary roughage on performance, carcass characteristics, and feeding behavior of feedlot cattle fed diets based on steam-flaked corn (SFC). In Exp. 1, crossbred steers (n = 200; BW = 314 kg) were fed 4 dietary treatments (DM basis): a standard SFC-based diet containing 9% rough...
متن کاملPerformance Characteristics and Nutritional Comparison of Broiler Chickens Fed with Barley and Triticale Based Diets
This study was performed with growing chicken (14 to 56 d of age) to evaluate the effects of feeding them a barley or triticale-based diet. The treatments were corn diet (1) as a control, hulless barley diet with (5) or without (2) enzyme, triticale diet with (6) or without (3) enzyme and hulled barley diet with (7) or without (4) a commercial β-glucanase enzyme. In a digestibility trial, 21 ma...
متن کاملEffects of supplemental amylase and roughage source on performance and carcass characteristics of finishing beef cattle
The use of enzymes in feedlot diets has not been evaluated extensively, and most research with high-concentrate diets has been with barley. Beauchemin et al. (1997) evaluated the addition of two enzyme mixtures that varied in the proportion of xylanase and cellulase activity to 95.1% concentrate feedlot diets based on either barley or corn. Feed efficiency for the overall finishing period was i...
متن کامل