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Journal of Dairy Science Vol. 83 No. 11 2596-2608
© 2000 by American Dairy Science Association ®
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Responses to Graded Postruminal Doses of Histidine in Dairy Cows Fed Grass Silage Diets

M. Korhonen 1, A. Vanhatalo 1, T. Varvikko 1, and P. Huhtanen 1

1 Animal Production Research, Agricultural Research Centre of Finland, FIN-31600 Jokioinen, Finland

Five Finnish Ayrshire cows were used in a 4 x 4 Latin square experiment designed to study the effects of graded doses of postruminal His infusion on milk production, arterial concentrations, and mammary uptakes of plasma amino acids (AA) as well as utilization of added His. Grass silage (16.9% CP) was given ad libitum with 8 kg of cereal-based concentrate per day (11.3% CP). Treatments were abomasal or duodenal infusions of 250 g of glucose/d in combination with 0, 2,4,or 6 g of His/d. Infusions did not affect dry matter intake (mean 18 kg/d). Infusion of His increased milk yield linearly from 27.0 to 28.8 kg/d, protein yield from 861 to 919 g/d and lactose yield from 1345 to 1457 g/d. Milk fat yield and content changed in a cubic manner (1240, 1167, 1296, and 1177 g/d and 4.60, 4.16, 4.60, and 4.09). Infusion of His had no influence on milk protein or lactose concentrations. Arterial Lys and His concentrations increased linearly, but other AA concentrations were unaffected as well as calculated arteriovenous differences and mammary AA uptakes. The extraction of His decreased linearly with an increasing amount of His. The utilization of added His (28%) was not affected by the level of infusion, and mammary AA uptake seemed to be regulated by an inverse relationship between arteriovenous difference of essential AA and calculated mammary plasma flow. This experiment confirmed that His is the first-limiting AA on grass silage-cereal based diets.

Key Words: dairy cows • histidine • amino acids • grass silage

Submitted on December 15, 1999
Accepted on May 30, 2000




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