Table 5.
Effects of cobalt concentration and source on serum cobalt and tissue concentration of finishing steers
| Item | Carbonate | Acetate | Lactate | SEM | Contrasts, P < | ||||
|---|---|---|---|---|---|---|---|---|---|
| 30 | 30 | 60 | 30 | 60 | C vs O1 | A vs L2 | 30 vs 603 | ||
| n, head | 20 | 20 | 20 | 20 | 20 | ||||
| Replicates | 4 | 4 | 4 | 4 | 4 | ||||
| Serum | |||||||||
| Serum cobalt4, ng/mL | 6.66b | 6.77ab | 13.83a | 6.32b | 12.17a | 2.79 | 0.96 | 0.64 | 0.02 |
| Serum B12, pg/mL | 179.4 | 211.8 | 209.5 | 207.7 | 192.3 | 37.9 | 0.26 | 0.64 | 0.95 |
| Tissue, dry matter basis | |||||||||
| Liver, ng/g | 450.8c | 718.0bc | 937.7b | 502.2c | 1535.7a | 230.2 | 0.08 | 0.24 | 0.01 |
| Kidney, ng/g | 282.6c | 346.6c | 821.2b | 360.3c | 934.8a | 83.6 | 0.22 | 0.25 | 0.01 |
| Heart, ng/g | 107.5 | 182.2 | 190.6 | 99.1 | 196.5 | 91.3 | 0.53 | 0.53 | 0.22 |
| Muscle, ng/g | 45.2b | 76.6ab | 69.7ab | 51.8b | 107.8a | 18.3 | 0.10 | 0.69 | 0.06 |
| Adipose, ng/g | 4.27c | 5.43bc | 8.94ab | 6.21c | 9.77a | 1.74 | 0.22 | 0.50 | 0.01 |
1Carbonate (inorganic) vs organic (acetate and lactate).
2Cobalt acetate vs. cobalt lactate.
3Cobalt feeding level of 30 mg/d vs. 60 mg/d.
4Serum cobalt analyzed only for the heavy block of steers, n = 2.
a,b,cMeans within the same row with unlike superscripts differ, P < 0.05.