共 11 条
- [1] CHOUDARY JB, 1968, J ANIM SCI, V27, P468
- [2] CURRAN S, 1986, J AM VET MED ASS
- [3] DUFOUR J, 1972, J ANIM SCI, V34, P85
- [4] GINTHER OJ, 1986, ULTRASONIC IMAGING R, P133
- [7] PIERSON RA, 1986, UNPUB ANIM REPROD SC
- [8] RAJAKOSKI E, 1960, ACTA ENDOCR-COP S, V52, P1