Importance of lactation number, age and season of calving for dairy cattle breed improvement

Ketil Gravir K. Gravir and C.G. Hickman
Bok · Engelsk · 1966 Ketil Gravir

Utgitt	Ottawa , 1966
Omfang	31 s. : ill.
Opplysninger	"Based on Canadian record of performance"
Dewey	636.2