Urinary Excretion of Purine Derivatives in Early-Weaned Calves
نویسندگان
چکیده
منابع مشابه
Duodenal flow of microbial nitrogen estimated from urinary excretion of purine derivatives in calves after early weaning.
Duodenal flow of microbial N (MN) was estimated from urinary purine derivatives to examine age-related changes in MN in male Holstein calves. In Exp. 1, endogenous purine derivatives were determined by measurement of purine derivatives in five calves fed nucleic acid-free milk replacer alone. In Exp. 2, the ratio of urinary excretion as purine derivatives to purines administered via the reticul...
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The present study was conducted on five healthy male cross bred calves to study the kinetic dispositionand urinary excretion of levofloxacin following its single subcutaneous administration at the dose of4 mg.kg-1. The concentration of levofloxacin in plasma and urine samples was estimated by microbiologicalassay. Peak plasma level of levofloxacin (2.8 ± 0.3 μg.ml-1) was observed at 45 min and ...
متن کاملUrinary excretion of purine derivatives as an index of microbial-nitrogen intake in growing rabbits.
Three experiments were carried out to establish a response model between intake and urinary excretion of purine compounds. In Expt 1 the relationship between the intake of purine bases (PB) and the excretion of total purine derivatives (PD) was determined in seven growing rabbits with a mean initial live weight (LW) of 2.03 (SE 0.185) kg, aged 70 d, each fitted with a wooden neck collar to prev...
متن کاملThe Urinary Excretion of Purine Derivatives in Sheep Offered Nitrogen and Phosphorus Deficient Diets
Urinary allantoin excretion as a measure of microbial protein production, has been shown to be responsive to ruminal nitrogen (N) supply (Balcells et al. 1993). Dietary phosphorus (P) deficiency has also been observed to reduce microbial protein flow (Gunn and Ternouth 1994). The aim of this experiment was to examine the effects of P and N deficiencies upon microbial protein formation, as deter...
متن کاملEstimation of Rumen Microbial Protein Supply Using Urinary Purine Derivatives Excretion in Crossbred Calves Fed at Different Levels of Feed Intake
A study was carried out to study the response of total purine derivatives (PD) excretion in urine to determine microbial N (MN) supply at four fixed levels of feed intake (namely 95, 80, 60 and 40% of voluntary intake). The crossbred (CB) calves were allocated according to a 4×4 Latin Square Design and fed wheat straw and concentrate (1:1). The rate of PD excretion (mmol/d) as a linear function...
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ژورنال
عنوان ژورنال: Nihon Chikusan Gakkaiho
سال: 1991
ISSN: 1346-907X,1880-8255
DOI: 10.2508/chikusan.62.1062