Reducing N excretion from individual cows is one way among others to better cope with the problem of the negative contribution of the dairy herd to the “Nitrogen cycle” on the farm. The objectives of this paper are first to quantify the effects of the main forage systems and protein feeding level on the amount of N excreted in relationship to their simultaneous effects on animal performances an...

Nitrogen excreted from body tissues impacts the calculation of multiple breath nitrogen washout (MBWN2) outcomes. The aim of this study was to determine the effect of tissue N2 on MBWN2 outcomes in both healthy subjects and patients with CF and to assess whether it is possible to correct for tissue N2. The contribution of tissue N2 to MBWN2 outcomes was estimated by comparing MBWN2-derived func...

The rapid onset of a marked fasting ketosis following low protein diet’s has been attributed by MacKay et al. (1, 2) to a lack of “stored” protein. They suggested that the catabolism of the “stored” prot,ein aft,er high protein diets, as measured by the urinary nitrogen excretion, supplied sufficient antiketogenic material (glucose) to reduce the need for metabolizing fats. Besides the increase...

To determine the minimum biological capacity for nitrogen (N) excretion for pigs, dietary regimens were created and fed that were designed to eliminate fecal excretion of undigested feed N, minimize endogenous N secretions and minimize intakes of nitrogenous compounds (amino acids) above those of the pigs biological needs. Excretion of undigested fecal N was eliminated by feeding ingredients co...

The influence of fiber source on fiber digestion in rabbits was investigated. Six fibrous feedstuffs with wide differences in chemical composition and particle size were selected: paprika meal, olive leaves, alfalfa hay, soybean hulls, sodium hydroxide-treated barley straw, and sunflower hulls. Six diets were formulated to contain one of these ingredients as the sole source of fiber. To avoid n...

The decrease in urinary nitrogen excretion (i.e. increased nitrogen retention) following intramuscular injection of human growth hormone (HGH) has been used to differentiate hypopituitary dwarfism from other types of short stature. While small decreases can be demonstrated in almost all children who are given HGH, in the hypopituitary child the decrease is greater and more prolonged. Using a st...

Adult dogs were given a proteinless diet plus casein, 80 calories/kilo, 0.4 gm. nitrogen/kilo/day. Sterile controlled inflammation was produced by subcutaneous injection of turpentine. The reaction is characterized by local swelling, induration, and abscess formation, terminated by rupture or incision after 3 to 5 days and by general reactions of malaise, fever, leucocytosis, and increased urin...

Recent interest in the r81e of proteins in gastrointestinal disease has prompted an investigation of certain aspects of this problem. Studies by Cannon and coworkers suggested to us that measurements of the intake and excretion of individual amino acids might supply more complete and significant data than the conventional nitrogen balances alone (1). Hence, in addition to the nitrogen balance, ...