Effect of degradable intake protein level on finishing cattle performance and ruminal metabolism

• Published in: Journal of animal science 1998-01, Vol.76 (1), p.242-248
• Main Authors: Shain, D.H, Stock, R.A, Klopfenstein, T.J, Herold, D.W
• Format: Article
• Language: English
• Subjects: ACIDE GRAS VOLATIL; ACIDO GRASO VOLATIL; ADIPOSE TISSUES; Ammonia - analysis; Ammonia - metabolism; Animal productions; Animals; AZOTE; BEEF CATTLE; Biological and medical sciences; Body Composition - physiology; BOEUF; BOVIN DE BOUCHERIE; BUEY; BULLOCKS; CANAL ANIMAL; CARCASS COMPOSITION; CARCASSE; CARCASSES; Cattle; Cattle - growth & development; Cattle - metabolism; Cattle - physiology; COMPOSICION DE LA CANAL; COMPOSITION DE LA CARCASSE; CONTENIDO DE MATERIA SECA; DIET; Diet - veterinary; DIETA; Dietary Proteins - metabolism; Dietary Proteins - pharmacology; Dietary Supplements; DRY MATTER CONTENT; Eating - physiology; EFFICACITE ALIMENTAIRE; EFICIENCIA DE CONVERSION DEL PIENSO; FAT THICKNESS; FEED CONVERSION EFFICIENCY; FEED INTAKE; Feeds; Fundamental and applied biological sciences. Psychology; GAIN DE POIDS; GANADO DE CARNE; GANANCIA DE PESO; INGESTION DE PIENSOS; LIVEWEIGHT GAIN; MAIS; MAIZ; MAIZE; Male; MEAT YIELD; METABOLISM; METABOLISME; METABOLISMO; NITROGEN; Nitrogen - analysis; Nitrogen - metabolism; NITROGENO; PESO; POIDS; PRISE ALIMENTAIRE (ANIMAUX); PROTECTED PROTEIN; PROTEINAS; PROTEINE; PROTEINS; Random Allocation; REGIME ALIMENTAIRE; RENDEMENT EN VIANDE; RENDIMIENTO CARNICO; RUMEN; Rumen - chemistry; Rumen - physiology; STEERS; TEJIDO ADIPOSO; TENEUR EN MATIERE SECHE; Terrestrial animal productions; TISSU ADIPEUX; UREA; Urea - metabolism; Urea - pharmacology; UREE; Vertebrates; VOLATILE FATTY ACIDS; WEIGHT; WEIGHT GAIN; Zea mays - metabolism
• ISSN: 0021-8812; 1525-3163; 0021-8812
• DOI: 10.2527/1998.761242x

Two finishing trials and a metabolism trial were conducted to evaluate level of supplemental degradable intake (crude) protein (DIP) in finishing diets on cattle performance, carcass characteristics, and ruminal metabolism. Finishing trials were conducted in two consecutive years using 128 crossbred yearling steers (BW = 343 +/- 5 kg, Trial 1) and 176 crossbred yearling steers (BW = 375 +/- 4 kg, Trial 2) in a randomized complete block design. Steers were fed dry-rolled corn diets containing urea at 0, .88, 1.34, or 1.96% (DM basis). No differences in DMI, daily gain, or feed efficiency were noted among steers receiving diets containing supplemental urea. However, steers fed diets supplemented with urea were 5.4% more efficient (P .01) and gained 6.6% faster (P .01) than steers receiving no supplemental urea. Metabolizable protein (MP) content of all diets exceeded the steers' requirements. However, diets containing no urea were deficient in DIP. In the metabolism trial, four ruminally fistulated steers (BW