Table 3.
The intake and excretion of N by cows present in the MS and SPS in the rainy and dry seasons in Yucatán, México.
| Item | Rainy | Dry | ||
|---|---|---|---|---|
| MS | SPS | MS | SPS | |
| Nitrogen Balance (g AU/day−1) | ||||
| N intake | 115.0 ± 4.3 bB | 172.0 ± 6.3 *aA | 144.9 ± 8.7 A | 142.7 ± 4.5 B |
| N total exported | 116.3 ± 4.4 B | 137.6 ± 8.0 | 138.4 ±13.5 A | 130.2 ± 11.1 |
| N urine | 46.8 ± 3.0 B | 62.4 ± 12.3 | 69.3 ± 8.8 A | 66.8 ± 5.3 |
| N feces | 32.5 ± 2.0 b | 43.9 ± 2.5 aA | 34.3 ± 2.4 | 34.4 ± 1.2 B |
| N milk | 37.0 ± 1.7 | 31.3 ± 1.4 | 34.8 ± 3.3 | 29.0 ± 1.3 |
| Balance | −1.3 ± 3.1 b | 34.4 ± 4.3 aA | 6.5 ± 13.6 | 12.5 ± 9.0B |
The * indicates that differences were found between the amounts of N consumed, as well as the N that were excreted (according to the t-Student test (p = 0.05)). Lowercase letters represent a comparison of the system-type means within the season, and uppercase letters are the comparison of the means between seasons for the same system. Different letters indicate significant differences (according to the Tukey test (p = 0.05)).