Du, L. and Zhang, Q. 2014. Estimation of genetic parameters of fertility traits in Chinese
Holstein cattle. Can. J. Anim. Sci. 94: 281–285. The objective of this study was to estimate
genetic parameters for fertility traits in Chinese Holstein heifers and cows. Data of 20169
animals with 42106 records over a period of 10 yr (2001–2010) were collected from
Sanyuan Lvhe Dairy Cattle Center in Beijing, China. Traits included age at first service …