共 19 条
[3]
COPPOCK CE, 1976, 71ST ANN M AM DAIRY
[6]
GUHL A. M., 1959, TRANS KANSAS ACAD SCI, V62, P80, DOI 10.2307/3626512
[7]
HOGLUND CR, 1975, 275 MICH STAT U RES
[9]
NEVENS WB, 1927, 289 ILL AGR EXP STA
[10]
PETRITZ DC, 1974, LIVESTOCK ENVIRONMEN, P346