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Abstract

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)....

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