Some Studies of Lactation Records

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Abstract
Lactation records of 15,442 cows in dairy herd improvement associations of 12 states were used. Average production of 4% fat corrected milk ranged from 8886 lb. for cows calving in July to 9108 lb. for those calving in Nov. The author concludes that quantity of production is not a factor of major importance in determining what time of year it is best for cows to calve. A study of low, medium and high records showed that persistency of milk production varied directly with the magnitude of production. A curve representing the lactation of the 15,442 cows was prepd. Normal lactation curves showed that every increase in milk was accompanied by a decrease in % of fat and vice versa except that for about a month after the peak of production there was a decline in both milk and % of fat.

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