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      Effects of Dietary Neutral Detergent Fiber Concentration and Alfalfa Hay Quality on Chewing, Rumen Function, and Milk Production of Dairy Cows

      Journal of Dairy Science
      American Dairy Science Association

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          The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage

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            Effect of Forage Quality on Intake and Forage-Concentrate Interactions

            D.R. Waldo (1986)
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              Impact of dietary fiber and physical form on performance of lactating dairy cows.

              Two trials were conducted to study the effects of forage intake and physical form on lactating cow performance. In trial 1, four cows in a 4 X 4 Latin square were fed long alfalfa hay at 28, 36, 45, and 53% of total dry matter plus concentrate. Total dry matter intake was not affected by forage percent. Total chewing time and milk fat percentage increased linearly with increasing forage consumption. Maximum 4% fat-corrected milk production occurred when diets contained 27% neutral detergent fiber and 18% acid detergent fiber. In trial 2, four cows in a 4 X 4 Latin square were fed diets of chopped alfalfa hay and concentrate in proportions to supply 27.4% total ration neutral detergent fiber. Mean particle length measured with an oscillating screen particle separator of the chopped hay was .26, .46, .64, and .90 cm. Total dry matter and forage dry matter intakes and total chewing were not influenced by forage mean particle length. Mean particle length did not affect actual milk or 4% fat-corrected milk production. Depression of milk fat percentage was prevented when forage mean particle length was greater than or equal .64 cm. Apparent digestibility of dietary constituents and rate of passage of hay and concentrate was not influenced by forage intake or physical form.
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                Author and article information

                Journal
                Journal of Dairy Science
                Journal of Dairy Science
                American Dairy Science Association
                00220302
                September 1991
                September 1991
                : 74
                : 9
                : 3140-3151
                Article
                10.3168/jds.S0022-0302(91)78499-3
                ff5c849b-cd6c-42fe-9f1a-5eb906cc0930
                © 1991
                History

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