Lacasse and Petitclerc. 2021. J. Dairy Sci. Supplementary Table 1

Number of services before first conception, age at first conception, age at calving and number of days open during first lactation of heifers exposed to 8 h of light and 16 h of dark (8L:16D) from 52 to 61 wk of age (ISO) and from 62 wk age to 8 wk before calving (ALLO) (S:S1), 8L:16D during ISO and 16L:8D during ALLO (S:L), 16L:8D during ISO and 8L:16D during ALLO (L:S) or 16L:8D during both periods (L:L).

首次受孕前的服务次数，首次分娩时的年龄，以及首次泌乳期间在光照8小时与黑暗16小时（8L:16D）条件下从52至61周龄（ISO）以及从62周龄至分娩前8周（ALLO）期间的开产天数，分别对应于ISO期间8L:16D和ALLO期间16L:8D（S:S1），ISO期间8L:16D与ALLO期间16L:8D（S:L），ISO期间16L:8D与ALLO期间8L:16D（L:S）或两个时期均采用16L:8D（L:L）的奶牛。