Breeding efficiency in your herd : How much rest do cows need after calving?
Shaffer, H.F.
Breeding efficiency in your herd : How much rest do cows need after calving? - Pennsylvania 1961 - 1 sheet - No. 235; Pennsylvania Agricult .
Breeding efficiency in your herd : How much rest do cows need after calving? - Pennsylvania 1961 - 1 sheet - No. 235; Pennsylvania Agricult .