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The effect of condensed tannins on the site of digestion of amino acids and other nutrients in sheep fed on Lotus corniculatus L

Published online by Cambridge University Press:  09 March 2007

G. C. Waghorn ,
M. J. Ulyatt ,
A. John  and
M. T. Fisher
G. C. Waghorn
Affiliation:
Applied Biochemistry Division, DSIR, Palmerston North, New Zealand
M. J. Ulyatt
Affiliation:
Applied Biochemistry Division, DSIR, Palmerston North, New Zealand
A. John
Affiliation:
Applied Biochemistry Division, DSIR, Palmerston North, New Zealand
M. T. Fisher
Affiliation:
Applied Biochemistry Division, DSIR, Palmerston North, New Zealand
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Abstract

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1. Sheep were used to evaluate the nutritional consequences of a low condensed-tannin concentration (22 g/kg dry matter (DM)) in lotus (Lotus corniculatus L.) (control group) compared with lotus given to sheep receiving intraruminal polyethylene glycol (PEG) infusion (PEG group). PEG selectively binds to tannins and prevents tannins from binding proteins.

2. DM intakes (1430 (SE 28) g/d) and digestibility of energy (663 (SE 4.5) kJ/MJ intake) were similar for both groups but the apparent digestion of nitrogen was lower in the control sheep (0.70) than in the PEG sheep (0.78; P < 0.001).

3. The proportion of N apparently digested before the abomasum (i.e. in the rumen) was lower (P < 0.05) in control sheep (0.12) than in PEG sheep (0.21; P < 0.05). Rumen ammonia concentrations were lower (P < 0.001) in control sheep than in PEG sheep. The proportion of neutral-detergent fibre (NDF) digested in the rumen was similar for both groups (0.48 (SE 0.012)) but less energy was digested in the rumen of the control (0.42) than of the PEG sheep (0.47; P < 0.05).

4. The flux of essential amino acids (EAA) through the abomasum of control sheep was 50% greater than that in PEG sheep; flux of non-essential amino acids (NEAA) was 14% higher in control than in PEG sheep. Apparent digestibility of EAA in the small intestine was similar for both treatments (0.67), but NEAA were less well digested in the control (0.55) than in the PEG sheep (0.69).

5. The presence of tannins in the control group increased net apparent absorption of threonine (57%), valine (89%), isoleucine (94%), leucine (30%), tyrosine (41%), phenylalanine (93%), histidine (90%) and lysine (59%), and reduced NEAA absorption by 10%, compared with PEG sheep.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 57 , Issue 1 , January 1987 , pp. 115 - 126
Copyright
Copyright © The Nutrition Society 1987

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