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Effects of forage intake level on nitrogen net flux by portal-drained viscera of mature sheep with abomasal infusion of an amino acid mixture

Published online by Cambridge University Press:  26 June 2013

M. EL-Sabagh ,
T. Sugino ,
T. Obitsu  and
K. Taniguchi
M. EL-Sabagh
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, Higashihiroshima-shi, 739-8528, Japan
T. Sugino
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, Higashihiroshima-shi, 739-8528, Japan
T. Obitsu
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, Higashihiroshima-shi, 739-8528, Japan
K. Taniguchi*
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, Higashihiroshima-shi, 739-8528, Japan
*
†E-mail: [email protected]
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Abstract

This study aimed to investigate the pattern of nitrogen (N) metabolites flux across the portal-drained viscera (PDV) of mature sheep over a wide range of forage intake, and to determine the effect of dry matter intake (DMI) on the PDV recovery of an abomasally infused amino acids (AA) mixture. Four Suffolk mature sheep (61.4 ± 3.6 kg BW) surgically fitted with abomasal cannulae and multi-catheters were fed four levels of DMI of lucerne hay cubes ranging from 0.4 to 1.6 fold the metabolizable energy requirements for maintenance. Each period lasted for 17 days: 7 days for diet adaptation, 5 days for measurement of N balance and N metabolites flux under basal pre-infusion conditions (basal phase) and 5 days for determining the recovery of the infused AA (584 mmol/day) across the PDV (infusion phase). Six sets of blood samples were collected on the last day of both basal and infusion phases. Increasing DMI increased portal release of AA and enhanced N retention. At 0.4 M and as a proportion of digested N, there was a marked drop in total AA-N release accompanied by greater ammonia-N release and urea-N uptake across the PDV. The incremental recovery ratio of infused AA across the PDV was altered with increasing DMI accounting for 0.88, 1.12, 1.23 and 1.31 at 0.4, 0.8, 1.2 and 1.6 M, respectively. In addition, across the individual AA, the net portal recovery ratio of infused methionine and valine increased linearly (P < 0.05) while that of phenylalanine, branched-chain AA and total essential AA tended to increase linearly (P < 0.10) with increasing DMI. These results indicated that DMI affects the net portal recovery of AA available in the small intestine of mature sheep.

Keywords

portal net fluxamino acidsenergymature sheep
Type
Nutrition
Information
animal , Volume 7 , Issue 10 , October 2013 , pp. 1614 - 1621
Copyright
Copyright © The Animal Consortium 2013 

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