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Multiplies daily yield by lactation length for per-cow output and scales it across the herd.
Lactation yield
Yield per lactation = daily yield x lactation days; herd yield = per cow yield x cows in milk
It leaves a 60-day dry period in a 365-day calving interval, and is the basis of official lactation records.
No. It peaks four to eight weeks after calving and then declines, so average daily yield is used here.