Table 3.
Frequencies of different brood compositions (sex in relation to laying order) as well as sex ratios (percent, ♂♂) in clutches of captive Rock pigeons (n = 239 clutches, 478 sexed embryos), in the course of the year, categorized in monthly laying date intervals (data from April 2001 to December 2003)
| Brood composition | Laying date (month) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
| Male (1)–female (2) | 2 | 0 | 8 | 10 | 9 | 8 | 7 | 0 | 1 | 1 | 0 | 1 | 47 |
| Male (1)–male (2) | 2 | 5 | 9 | 9 | 12 | 17 | 8 | 3 | 2 | 1 | 0 | 1 | 69 |
| Female (1)–female (2) | 5 | 3 | 5 | 6 | 5 | 9 | 8 | 6 | 3 | 6 | 0 | 2 | 58 |
| Female (1)–male (2) | 3 | 1 | 4 | 9 | 10 | 8 | 13 | 8 | 3 | 2 | 4 | 0 | 65 |
| Total | 12 | 9 | 26 | 34 | 36 | 42 | 36 | 17 | 9 | 10 | 4 | 4 | 239 |
| Sex ratio | 37.5 | 61.1 | 57.7 | 54.4 | 59.7 | 59.5 | 50.0 | 41.2 | 44.4 | 25.0 | 43.8 | 52.3 | |