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

摘要: Two finishing trials and a metabolism trial were conducted to evaluate level of supplemental degradable intake (crude) protein (DIP) in diets on cattle performance, carcass characteristics, ruminal metabolism. Finishing con- ducted two consecutive years using 128 crossbred yearling steers (BW = 343 ± 5 kg, Trial 1 ) 176 375 4 2 randomized complete block design. Steers fed dry-rolled corn containing urea at 0, .88, 1.34, or 1.96% (DM basis). No differences DMI, daily gain, feed efficiency noted among receiving urea. However, supplemented with 5.4% more efficient ( P < .01) gained 6.6% faster than no Metabolizable (MP) content all exceeded the steers' requirements. deficient DIP. In trial, four ruminally fistulated 380 22 kg) used × Latin square design (ad libitum) similar those trials. Nitrogen ammonia N concentration increased linearly .05) increasing supplementation. Diets calculated be DIP, resulting reduced bacterial synthe- sis. Results indicate that are N. Supplementing these an inexpensive source improved animal performance. supplemen- tation above .88% was not beneficial.