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Effect of duodenal proline infusion on milk production and composition in dairy cows

Published online by Cambridge University Press:  02 September 2010

I. Bruckental ,
I. Ascarelli ,
B. Yosif  and
E. Alumot
I. Bruckental
Affiliation:
Institute of Animal Science, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
I. Ascarelli
Affiliation:
Institute of Animal Science, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
B. Yosif
Affiliation:
Institute of Animal Science, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
E. Alumot
Affiliation:
Institute of Animal Science, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
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Abstract

Four Israeli-Friesian cows, two at peak and two at mid lactation, were fitted with duodenal cannulas. They were given proline or water infusions for 8-day periods to evaluate the effect of duodenal infusion of proline on arginine uptake by the mammary gland and on milk yield and composition of dairy cows. Milk fat content and 40 g/kg fat-corrected milk yield increased for all cows due to proline infusion. Milk protein concentration during either early or mid lactation and milk protein yield during early lactation, were not affected by proline infusion. Milk protein yield during mid lactation was increased due to proline infusion. Arginine uptake by the udder dropped by one-half during proline infusion. Results suggest that post-ruminal administration of supplemental proline reduced requirements for arginine by the udder and improved efficiency of dietary energy utilization.

Keywords

dairy cowsmilk compositionmilk yieldproline
Type
Papers
Information
Animal Production , Volume 53 , Issue 3 , December 1991 , pp. 299 - 303
Copyright
Copyright © British Society of Animal Science 1991

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