Crude protein requirements of finishing cattle over 1000 lb are below 10 percent of dietary dry matter (NRC, 1976). However, crude protein is usually fed in excess of 10 percent of DM due to decreased feed intake and performance at lower protein levels. Finishing diets usually consist of cereal grains fed ad libitum. With milo and corn grains, substantial quantities of starch are not completely...

Acute exacerbations of chronic obstructive pulmonary disease (COPD) accompanied with hypoxaemia may induce net protein catabolism and hypoxaemia could be an important trigger of a systemic catabolic response. The aim of this study was to examine the anabolic effects of recombinant human insulin-like growth factor-I (IGF-1) in rats exposed to hypoxia. Although acute hypoxia is usually accompanie...

An experiment was carried out to evaluate how interactions between forage to concentrate ratio and dietary crude protein level may alter nitrogen efficiency and UT-B expression in growing Baluchi male lambs. Four Baluchi male lambs [30 ± 2 kg BW] were used in a 4 × 4 latin square design with 28-d periods and a 2 × 2 factorial arrangement of dietary treatments. The treatments fed forage: concent...

On the cover : Steers grazing strips of rhizoma peanut ( Arachis glabrata Benth) and bahiagrass Paspalum notatum Flüggé) at North Florida Research Education Center, Marianna, FL, USA. See article, “Nutrient excretion from cattle nitrogen‐fertilized grass or grass‐legume pastures”, by Garcia et al. in this issue Agronomy Journal . Photo Credit: Liza Garcia. image

Introduction There is increased pressure on agriculture to reduce nitrogen (N) excretion from different production systems. In order to do so, it is of value to know how diets compare in terms of N excretion, as this could have both financial and environmental consequences. A mechanistic model describing the N digestion and metabolism in ruminants was developed from the PDI protein system to en...