7[2]G D E Bulnes A,Herreros mag,Boter C.Echographic study of pregnancy in dogs[J].Medicina Veterinaria,1993,10(6):345-354.
8[3]Lukan M,Kacmarik J,Csicsai A.The advantage and disadvantage of ultrasonography in the diagnosis of pregnancy in bitches[J].Fdia veterinaria,1994,38(1/2):47-50,7.
9[5]Tiemessen I,Rothuiien J,Woorhout G.Ultrasonography in the diagnosis of congenital portosystemic shunts in dogs[J].Veterinary quarterly,1995,17(2):50-53.
10[6]Tello C L,Reousens O J.Ultrasonographic renal vollume and its correlation with body weight and age in dogs[J].Avances en ciencias veterinaries[J].1995,10(2):117-123.
9Bulnes A,Herreros M,Boter C,et al.Echographic study of pregnancy in dogs[J].Med Vet,1993,10 (6):345-354.
10Lukan M,Kacmarik J,Csicsai A,et al.The advantage and disadvantage of ultrasonography in the diagnosis of pregnancy in bitches[J].Fdia Vet,1994,38 (1/2):47-50.
