共 8 条
[1]
BRODY S, 1926, J AGR RES, V33, P3
[2]
HOGAN AG, 1923, J AGR RES, V25, P10
[3]
JOSHI NR, 1953, FAO AGR STUDY, V19
[4]
MATTHEWS CA, USDA TECH B
[5]
MCDOWELL RE, 1953, J ANIMAL SCI, V12, P4
[6]
MCDOWELL RE, UNPUB J DAIRY SCI
[7]
RATHORE A, 1949, THESIS IOWA STATE CO
[8]
Swett WW, 1939, J AGRIC RES, V58, P0199