Table 3. Milk production in parity one, all offspring groups.
| kg ECM | kg milk | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Factors | diff | sd | total | sd | diff | sd | total | sd | |
| B 1 B 2 | C 1 | 0 | — | 8215 | 31.72 | 0 | — | 8255 | 35.50 |
| B 1 H 2 | C 1 | -5.292 | 10.10 | 8209 | 31.77 | -6.971 | 10.28 | 8248 | 35.55 |
| H 1 B 2 | C 1 | -35.13 | 9.939 | 8180 | 31.62 | -36.46 | 10.12 | 8218 | 35.41 |
| H 1 H 2 | C 1 | -15.42 | 10.06 | 8199 | 31.65 | -17.62 | 10.24 | 8237 | 35.44 |
| B 1 B 2 | C 1 | 0 | — | 8215 | 31.72 | 0 | — | 8255 | 35.50 |
| B 1 B 2 | C 2 | 41.85 | 8.015 | 8257 | 31.98 | 40.63 | 8.160 | 8295 | 35.75 |
| B 1 B 2 | C 3 | 30.09 | 18.83 | 8245 | 36.15 | 30.00 | 19.17 | 8285 | 39.65 |
| B 1 B 2 | C 4 | 55.27 | 48.66 | 8270 | 57.66 | 54.96 | 49.53 | 8309 | 60.52 |
| B 1 B 2 | C 5 | -100.1 | 128.2 | 8115 | 131.8 | -95.91 | 130.5 | 8159 | 134.9 |
The impact of sex of offspring, B/H, and calving difficulty, C, on milk yield in kg and ECM during the first lactation period, when considering all four possible combinations of sex. The ‘diff’ column is the relative effect compared to the reference indicated by 0; the ‘total’ column is the expected production yield for the given combination of factors; ‘sd’ is the standard deviation. Numbers in boldface are significant on a 95% level.