Effect of Age at First Pregnancy on Milk Production and Reproductive Performance During the First 2 Lactations in Holstein Dairy Cattle
ZHAO Shanjiang, SHUAI Zhiqiang, PANG Yunwei, HAO Haisheng, ZOU Huiying, DU Weihua, ZHAO Xueming, ZHU Huabin
Acta Veterinaria et Zootechnica Sinica . 2020, (4): 732 -742 .  DOI: 10.11843/j.issn.0366-6964.2020.04.009