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- W2150236430 abstract "The protein content of the diet modifies feed intake in lactating dairy cows, but the mechanisms are unclear. The objective of this trial was to determine whether a duodenal perfusion of protein, with or without the expected increase of milk production, plays a role in the feed intake response. Treatments were (C): control perfusion (500 g .d -1 of glucose + 145 g.d -1 of urea); (P): duodenal perfusion of soy-protein isolate (500 g .d -1 ); and (Pim): the same treatment as (P) but with milk yield limited to the control by incomplete milking. Six rumen and duodenal-cannulated cows producing 35 kg.d -1 of milk were assigned in a double 3 〈 3 Latin square design with periods of 4 weeks and inter-periods of 2 weeks. The intake, number and size of the meals, intake duration, chew- ing activities, digestibility (DM, OM, CP, NDF and ADF), molar proportions of volatile fatty acids and ammonia were not significantly affected by protein perfusions (P and Pim) ( P > 0.05). Duode- nal protein perfusion (P) significantly increased ( P < 0.05) milk yield (+ 4.7 kg.d -1 ), protein production (+ 160 g.d -1 ) and protein content of milk (+ 1.8 g .kg -1 ) in comparison to the control perfusion (T). With incomplete milking (Pim), the milk production was the same as in the control but protein con- tent increased (+ 1.9 g .kg -1 ) and fat content decreased (-3.2 g.kg -1 ). Incomplete milking did not reduce intake, suggesting that mechanisms controlling intake and milk production were partly dissociated. dairy cow / intake / protein / incomplete milking" @default.
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- W2150236430 date "2000-11-01" @default.
- W2150236430 modified "2023-10-18" @default.
- W2150236430 title "Effect of duodenal perfusion of protein on the intake of dairy cows with or without incomplete milking" @default.
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- W2150236430 doi "https://doi.org/10.1051/animres:2000139" @default.
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