Farm Animal Metabolism and Nutrition
magnitude of the differences in vitrowere relatively small when compared with the differences in metabolic rates in vivo. Indeed ...
influence the rate of Na+entry into the cell, and hence Na+,K+-ATPase activity. Nearly all measurements of ion transport have be ...
Boron, W.F. and De Weer, P. (1976) Intracellular pH transients in squid giant axons caused by CO 2 , NH 3 and metabolic inhibito ...
McBride, B.W. and Milligan, L.P. (1985b) Magnitude of ouabain-sensitive respiration in the liver of growing, lactating and starv ...
Chapter 8 Trace Element Dynamics W.T. Buckley Agriculture and Agri-Food Canada, Brandon Research Centre, Brandon, Canada Introdu ...
tissues maintain homeostasis more readily than others. Furthermore, there is a large variation among species. Responses to chang ...
dietary intake. Such a simulation of Zn metabolism was constructed for this chapter from the results of numerous Zn metabolism s ...
with 24 μg Zn g^1 diet, while there was no effect on Zn content of liver, kidneys, spleen, brain, lungs, reproductive tissues, ...
absorption occurred with increasing dietary Zn concentration. Their data (Johnson et al., 1988) were subjected to non-linear reg ...
166 W.T. Buckley Fig. 8.2.Dietary Zn intake in young growing male rats fed a semi-synthetic diet with varying Zn concentrations. ...
rate of transfer of plasma^65 Zn to liver in humans, rats and cattle. Tracer studies with rats, cows and calves show enhanced re ...
Urinary Zn = 7.4 (1 e0.0074 Zn intake) (8.2) where units of urinary Zn and Zn intake are μg day^1 (Fig. 8.5). This expressi ...
Trace Element Dynamics 169 Fig. 8.6.Urinary Zn excretion by young growing male rats. The figure is a simulation based on a kinet ...
170 W.T. Buckley Fig. 8.8.Percentage of total Zn excretion (faeces + urine) excreted in the urine of young growing male rats. Th ...
g^1 diet was unable to support as rapid growth as 12–18 μg Zn g^1 diet during the full 28-day period. During the last days of ...
day^1 ) and endogenous faecal excretion continued to rise, which is the pattern observed by Weigand and Kirchgessner (1978). As ...
organ Zn were simulated for growing rats receiving adequate (Fig. 8.12) or deficient (Fig. 8.13) dietary Zn. Rats fed a deficien ...
and other gastrointestinal secretions, with only a small percentage of endogenous loss in the urine. Surface losses from sweat, ...
liver Cu occurs. Laying hens maintain a constant liver Cu concentration up to a relatively high dietary concentration of 600 μg ...
Simulations of Cu metabolism in humans also predict quantitatively greater changes in endogenous excretion than absorption in re ...
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