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Brian Palmer Raymond J. Jones Somsak Poathong Jeerasak Chobtang 《Tropical animal health and production》2010,42(2):161-164
Goats fed Leucaena leucocephala (leucaena) at an experimental site in Thailand were shown to be excreting DHP in their urine. This was unexpected as earlier results from another site had shown that goats and cattle fed leucaena did not excrete DHP and so possessed DHP—degrading bacteria. Goats sampled near the earlier sample site excreted no DHP in their urine. Rumen fluid taken from these goats was successfully used to transfer DHP—degrading ability to the goats at the Experimental site some 350 km away that did not show the presence of DHP-degrading bacteria. Degradation of mimosine in-vitro and excretion of DHP in the urine ceased 72 hr after addition of rumen fluid and infusion with rumen fluid from protected goats, respectively. The situation in Thailand may not be unique. Countries where leucaena is fed should check that animals are protected. Fortunately, the ferric chloride urine test is simple to use and effective in detecting the problem and also the recovery after transfer of rumen fluid from protected animals. 相似文献
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Palmer Brian Jones Raymond J. Poathong Somsak Chobtang Jeerasak 《Tropical animal health and production》2010,42(8):1731-1735
The study assessed the value of Leucaena leucocephala bark in leucaena—grass hay diets fed to Thai goats. Thai goats in metabolism pens were fed diets containing leucaena leaf
(55%) + pangola grass hay (hay, 45%); leucaena leaf (48%) + leucaena bark (9%) + hay (43%); leucaena bark (57%) + hay (43%);
and hay only. Feed percentages are expressed on a dry weight basis. The digestibilities of dry matter (DM) and crude protein
(CP) were measured for the four diets. Leucaena bark had lower CP concentration than the leaf (11.7 vs. 25.9), and the leucaena
bark + hay diet had lower DM and CP digestibility than the other diets. The calculated bark digestibilities of DM and CP of
44.1% and 38.2%, respectively, were much lower than the values for the leucaena leaf of 62.9% and 89.1%, respectively. The
lower than expected CP digestibility was attributed to higher tannin levels in the bark compared to the leaves. Despite this,
the bark was well accepted by the goats and was often preferred to the hay. Stripping of the bark by goats also results in
stems that dry quicker and have higher calorific value as fuel. However, if leucaena branches are fed as a sole diet, the
goats may consume up to 30% of bark on a DM basis and this would reduce nutritive value and animal productivity. 相似文献
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