2012
DOI: 10.1590/s1516-35982012000300046
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Abstract: -The objective of this study was to estimate the urinary creatinine excretion by the shrunk body weight (SBW). In experiment I, 32 Nellore bulls with initial body weight of 259±24.9 kg and 14±1 months-old were used. The group was divided in four animals to maintenance and twenty eight animals feeding ad libitum and separated in four groups; each group was slaughtered at different times of feedlot (42, 84, 126 and 168 days). The diet was composed of corn silage and concentrate (55:45). Before the slaughters, th… Show more

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Cited by 62 publications
(28 citation statements)
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“…Although creatinine excretion rates (coefficient; mg/kg of BW per d) among cows are variable as shown previously, diurnal variation of creatinine production in the body and excretion in urine within cow is likely small. Creatinine is produced from muscle and is rarely reused in the body (Silva et al, 2012), and the production of creatinine occurs at constant rate proportional to the mass of body muscle, resulting in a constant excretion of creatinine in urine (de Groot and Aafjes, 1960;Erb et al, 1977;Chizzotti et al, 2008). Therefore, the large diurnal variation of creatinine concentration in urine could be mainly attributed to diurnal changes in urine volume rather than diurnal changes in creatinine production.…”
Section: Resultsmentioning
confidence: 99%
“…Although creatinine excretion rates (coefficient; mg/kg of BW per d) among cows are variable as shown previously, diurnal variation of creatinine production in the body and excretion in urine within cow is likely small. Creatinine is produced from muscle and is rarely reused in the body (Silva et al, 2012), and the production of creatinine occurs at constant rate proportional to the mass of body muscle, resulting in a constant excretion of creatinine in urine (de Groot and Aafjes, 1960;Erb et al, 1977;Chizzotti et al, 2008). Therefore, the large diurnal variation of creatinine concentration in urine could be mainly attributed to diurnal changes in urine volume rather than diurnal changes in creatinine production.…”
Section: Resultsmentioning
confidence: 99%
“…The total daily urine volume was estimated as the ratio between the calculated daily urinary creatinine excretion and urine creatinine concentration. Daily creatinine excretion was calculated using the equation for estimation of urinary creatinine excretion (UCE): UCE (g/day)¼0.0345 Â SBW 0.9491 , where SBW¼shrunk body weight, which was obtained by Silva et al (2012). Creatinine was quantified by a colorimetric system based on the Jaffe reaction, using picrate and acids in commercial kits (Labtest s , Belo Horizonte, Minas Gerais).…”
Section: Experimental Procedures and Sample Collectionsmentioning
confidence: 99%
“…The non-specific chromogens were eliminated by a pre-reading because they had an immediate formation. The determination of urinary daily was done using the relation between the daily excretion of creatinine, adopting the equation proposed by Silva et al (2012) and its concentration in the "spot" samples. Where: CWF = corporal weight in fasting.…”
Section: Chemical Analysismentioning
confidence: 99%