The Ultrasound Image Change of Pregnant Bitches of the Reproductive System at Different Time
WANG Lü-lin，HE Ya-ge，GAO Xin-yu，XIN Chun-yan，GAO Pei-bin，DENG Li-xin
ACTA VETERINARIA ET ZOOTECHNICA SINICA . 2015, (8): 1455 -1462 .  DOI: 10.11843/j.issn.0366-6964.2015.08.023