Cattle. Intake of OM and thus Na, K, Ca, Mg, and P was relatively higher
(tW °'75 basis ) in cattle than goats fed the same LS diet.
Apparent absorption of Na was not different between the two species
whereas steers had a smaller (P< 0.05 ) apparent absorption (g absorbed/g
intake) of K (0.844+0.016 vs. 0.895+0.011), Ca (0.039+0.039 vs.
0.215___0.024), Mg (0.268+0.030 vs. 0.422+0.015) and P (0.341 ___0.042
vs. 0.529 _ 0.020). As a result, higher concentrations (g/kg) of K (5.65 + 0.70
vs. 3.53+0.34, P<0.05), Mg (5.80+0.18 vs. 4.55+0.08, P<0.001 ) and P
(5.48 ___ 0.39 vs. 3.88 ___ 0.19, P< 0.01 ) were observed in faecal DM of steers.
Urinary Na loss in cattle (relative to intake) was three times that of LS goats
but loss of K, Ca and P was similar, a consequence of the higher intake and
lower apparent absorption of K, Ca and P in cattle compared with goats; Mg
excretion remained less (0.150_+0.09 vs. 0.311 _+0.012, P< 0.05) in cattle
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