Something like this for a 1200lb cow at or after
calving:
27 lb DM intake × .59 TDN required = 16 lb/day TDN
required
23 lb straw × .50 TDN = 11.5 lb/day TDN from straw.
7lb alfalfa pellets × 0.649 TDN = 4.54 lb TDN from
alfalfa
11.5 lb/day TDN from straw 4.54 lb/day TDN from
alfalfa pellets = 16.04 lb/day TDN
A cow will struggle to eat that much straw in a day
though. I guess it depends how much hay you are still
feeding and how good the analysis is but I would
guess you are still short on energy.
calving:
27 lb DM intake × .59 TDN required = 16 lb/day TDN
required
23 lb straw × .50 TDN = 11.5 lb/day TDN from straw.
7lb alfalfa pellets × 0.649 TDN = 4.54 lb TDN from
alfalfa
11.5 lb/day TDN from straw 4.54 lb/day TDN from
alfalfa pellets = 16.04 lb/day TDN
A cow will struggle to eat that much straw in a day
though. I guess it depends how much hay you are still
feeding and how good the analysis is but I would
guess you are still short on energy.
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