A continuous trial with 105 lactations covering 5 harvest yr was to study effects of reducing annual concentrate feeding and method of its allocation on ad libiturn forage intake, production, herd health and profitability in Holstein cows. Forage was offered free-choice during lactation, and a common concentrate was offered to all cows. Treatments were (concentrate:milk in wk 1 to 8; rate of decline after wk 8; and annual concentrate as a theoretical percent of treatment) 1) 1:2.0, normal, 100; 2) 1:2.5, normal, 80; 3) 1:2.0, abrupt, 80; 4) 1:3.3, normal 60; and 5) 1:2.5, abrupt, 60.
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Holter et al. (1982) studied this question.
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