39 



5 10 15 20 25 30 35 40 45 50 55 

 Days on trial 



FIGURE 4-1. Mean serum Zn levels for sheep supplemented with 

 different sources of Zn . SEM (ug/ml) for d .40, d 14 .40, 

 d 21 .43, d 28 .59, d 49 .34, d 55 .63. 



5 10 15 20 25 30 35 40 45 50 55 

 Days on trial 



FIGURE 4-2. Mean serum Cu levels for sheep supplemented with 

 different sources of Zn . SEM (|ig/ml) for d .15, d 14 .16, 

 d 21 .18, d 28 .15, d 49 .20, d 55 .23. 



