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Indian Journal of Social Research Vol.54 (5) (Sep - Oct, 2013) (399-405)

IN VITRO DEGRADATION OF MIMOSINE IN DIFFERENT PARTS OF SUBABUL (LEUCAENA LEUCOCEPHALA)

P Prabaharan
Veterinary Doctor, 2/362-b, Kandapuri, Reddipatty, Namakkal, Tamil Nadu

P A Davasia
Professor (Retired), Department of Animal Nutrition
College of Veterinary and Animal Sciences, Mannuthy, Thrissur, Kerala

Abstract

A detailed study was conducted to analyze the mimosine degradation level of pure form of mimosine, immature leaves, mature leaves, tender stem and seeds of subabul (Leucaena leucocephala) by using the Saanen x Malabari adult healthy goats by in vitro degradation technique. The percentage of in vitro degradation of mimosine in respect to the pure form of mimosine, immature leaves, mature leaves, tender stem and seeds increased significantly at every 12 hour intervals of incubation from 0 to 48 hours, even though the degradation was incomplete with all the treatments. The average 0 hour losses recorded during the in vitro degradation studies with different treatments might be due partly to loss of mimosine and partly to its degradation by microorganism and enzymes in the medium during manipulation of samples.

Introduction

Leguminous fodders play a major role in livestock production. Leucaena leucocephala (Subabul) is an arbarescent legume shrub or tree belonging to mimosiaceae. It grows well in a wide range of soils with the marked exception of very acid soils and water logged soils and is well adapted to calcareous logged soils. Subabul grows well in tropics and subtropics. Because of its nutritive value it has used as an important leguminous fodder to livestock especially during the lean period of the year. This species can grow well anywhere in the tropics and subtropics with an annual rainfall range of 500 to 3000 mm. The use of subabul as an all purpose livestock feed has been limited by the presence of mimosine, a toxic, non protein amino acid that causes low weight gains, general poor condition and hair loss in ruminants and non ruminants (Hegarty et al., 1976). Clinical sign in ruminants includes los of appetite, excessive salivation, incoordination of gait, enlarged thyroid glands, poor breeding performance and the production of goitrous calves that die at birth (Jones et al., 1979). The extend of degradation of mimosine in the rumen varies with the species of animals (Magarrity, 1978). No systematic work has been carried out on the rumen microbial degradation of mimosine by Indian goats. Therefore, the study has been carried out to evaluate in vitro degradation of mimosine in the Saanen x Malabari adult healthy goats by artificial rumen technique.

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