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Effect of the tropical tannin-rich shrub legumes Calliandra calothyrsus and Flemingia macrophylla on methane emission and nitrogen and energy balance in growing lambs

Published online by Cambridge University Press:  15 April 2008

T. T. Tiemann
Affiliation:
ETH Zurich, Institute of Animal Science, Universitätstrasse 2, CH-8092 Zurich, Switzerland Tropical Grass and Legume Project, CIAT, Cali, Colombia
C. E. Lascano
Affiliation:
Tropical Grass and Legume Project, CIAT, Cali, Colombia
H.-R. Wettstein
Affiliation:
ETH Zurich, Institute of Animal Science, Universitätstrasse 2, CH-8092 Zurich, Switzerland
A. C. Mayer
Affiliation:
ETH Zurich, Institute of Animal Science, Universitätstrasse 2, CH-8092 Zurich, Switzerland
M. Kreuzer
Affiliation:
ETH Zurich, Institute of Animal Science, Universitätstrasse 2, CH-8092 Zurich, Switzerland
H. D. Hess*
Affiliation:
Agroscope Liebefeld-Posieux Research Station (ALP), Tioleyre 4, CH-1725 Posieux, Switzerland
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Abstract

The objective of this study was to test whether the use of tannin-rich shrub legume forage is advantageous for methane mitigation and metabolic protein supply at unchanged energy supply when supplemented in combination with tannin-free legumes to sheep. In a 6 × 6 Latin-square design, foliage of two tannin-rich shrub legume species (Calliandra calothyrsus and Flemingia macrophylla) were used to replace either 1/3 or 2/3, respectively, of a herbaceous high-quality legume (Vigna unguiculata) in a diet composed of the tropical grass Brachiaria brizantha and Vigna in a ratio of 0.55 : 0.45. A Brachiaria-only diet served as the negative control. Each experimental period lasted for 28 days, with week 3 serving for balance measurement and data collection inclusive of a 2-day stay of the sheep in open-circuit respiration chambers for measurement of gaseous exchange. While Vigna supplementation improved protein and energy utilisation, the response to the partial replacement with tannin-rich legumes was less clear. The apparent total tract digestibilities of organic matter, NDF and ADF were reduced when the tannin-rich plants partially replaced Vigna, and the dose–response relationships were mainly linear. The tannin-rich plants caused the expected redistribution of more faecal N in relation to urinary N. While Flemingia addition still led to a net body N retention, even when fed at the higher proportion, adding higher amounts of Calliandra resulted in body protein mobilisation in the growing lambs. With respect to energy, supplementation of Vigna alone improved utilisation, while this effect was absent when a tannin-rich plant was added. The inclusion of the tannin-rich plants reduced methane emission per day and per unit of feed and energy intake by up to 24% relative to the Vigna-only-supplemented diet, but this seems to have been mostly the result of a reduced organic matter and fibre digestion. In conclusion, Calliandra seems less apt as protein supplement for ruminants while Flemingia could partially replace a high-quality legume in tropical livestock systems. However, methane mitigation would be small due to associated reductions in N and energy retention.

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Copyright
Copyright © The Animal Consortium 2008

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