Fifty sheep received a pelleted ration containing between 0,31 and 0,38% phosphorus. Pooled faecal samples, composed of 3 faecal pellets from 30 randomly selected sheep, were taken on 15 occasions during 23 days. The faecal phosphorus levels of the 15 pooled samples were remarkably constant with a mean of 0, 94% and a coefficient of variation of 6,38 %. However, when the animals received either more or less phosphorus, there was a corresponding respective increase or decrease in the faecal phosphorus levels above and below the limits set in the repeat-ability trial. There was also arise in faecal phosphorus when the total food intake was halved. The faecal samples were also analysed for calcium and magnesium.
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