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Reproductive records on Holstein cows from the Fengfangshan Dairy Farm in Chengdu, Sichuan, China were collected from 1990 to 1995. Heifers had their first oestrus at the age of 513.6±46.7 days. Oestrus occurred in 9.8-11.2% females in March-May and in November-December (5.9-7.8% in other months)....

Zi XiangDong; Yang YongXing; Zhou GuoQuan; Chen ChangLun; Song ZiHua
China Dairy Cattle, 1997, No. 1, pp 16-18