共 21 条
[1]
ALLEN C. E., 1952, SCI AGRIC [OTTAWA], V32, P403
[4]
BELL JM, 1965, 1257 CAN DEP AGR PUB, P45
[5]
BELZILE R., 1963, CANADIAN JOUR ANIMAL SCI, V43, P169
[7]
FROLICH A., 1953, Kungliga Lantbrukshogskolans Annaler, V20, P105