holstein average milk per milking
â¢ Of the more than 9 million dairy cows in the United. States, 94 percent are of Holstein descent. â¢ The average Holstein produces around 23,000 pounds. of milk, or 2,674 gallons, of milk, each lactation. That. amounts to 75 pounds, or almost 9 gallons of milk, daily during a cowâs standard lactation of 305 days. â¢ Holstein cows usually calve for the first time when they. are 23 to 26 months of age.