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Studies On Magnesium In Ruminant Nutrition. 5. The Indirect Determination Of The Intake Of Magnesium, Calcium And Potassium By The Grazing Cow



Studies On Magnesium In Ruminant Nutrition. 5. The Indirect Determination Of The Intake Of Magnesium, Calcium And Potassium By The Grazing Cow



British Journal of Nutrition 18: 357-368



All defacations and urinations were collected by attendants for 3 days from three old cows given first hay and secondly cut herbage. Each cow was dosed twice daily with a standard quantity of chromium sesquioxide (Cr2O3) incorporated in a specially prepared paper. The concentration and amounts of Ca, Mg and K were determined in the samples of excreta, that of Cr2O3 in the samples of feces and that of creatinine in the samples of urine. To determine the day-to-day variation in the excretion of creatinine, urine was collected over 24 hr periods for a total of 14 days from each of eight cows. The coefficient of variation of the daily output of creatinine for each of the cows ranged from 6.3 to 14.7% with a mean of 10.8%. In general, the diurnal variation in the ratios of the concentration of Ca, Mg and K to that of creatinine were, in order of increasing coefficient of variation, K creatinine, Mg: crea-tinine and Ca: creatinine. None of the ratios showed well-developed diurnal rhythms. The error in the urinary output arising from sampling only at milking time ranged from 0.1 to 1.0% of the intake of Ca and of Mg and from 1 to 5% of the intake of K. None of the ratios of concentration of Ca, Mg and K to that of Cr2O3 in faeces showed well-defined diurnal cycles, but there was a tendency for the ratio Ca: Cr2O3 to be lower in the evenings and higher in daylight. Measured fecal outputs were compared with the output estimated from the concentrations of Ca, Mg, K and Cr2O3 in grab-samples of feces voided at milking time. All estimates underestimated the measured excretion by about 13-18%, mainly because of Cr2O3 output being less than Cr2O3 intake over the period of estimation and not because of the sampling procedure. The errors associated with the proposed method were discussed. It was concluded that the error due to taking samples of urine and feces at milking time was small, the major source of error in the determination of Ca and Mg in excreta was the low recovery of Cr2O3 and the error introduced by ignoring the balance was of importance only for Ca.

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Accession: 014690220

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PMID: 14188294


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