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EYO, Joseph Effiong and INYANG, Nicholas Mathias 411987) as no mention of it was made, eventhough they had employed some of thesecharacters. For instance, Sydenham (1978) inre-describing the specimens of six clariid speciesfrom West Africa employed such characters asstandard length, total length, preanal length,maximum caudal peduncle depth, pelvic finheight anal fin height and dorsal fin height.These characters were subsequently employedby Ezenwaji (1986) and Teugels (1980, 1982 a,b, c.). These characters thus represent “keycharacters” for discriminating between the“small” and “large” clariids. From the above, it isclear that with regards to Mayr’s coefficient ofdifference, C. ebriensis and C. albopunctatus aswell as C. gariepinus and C. anguillaris may besibling (cryptic) species. Lagler, et al. (1977)defined sibling species as those species that aremorphologically indistinguishable or very similarbut are shown to be fully differentiated bygenetical, physiological, ecological or behavioraldifferences that often produced reproductiveisolation.REFERENCESEYO, J.E. (1997). Morphometric and CytogeneticVariations among Clarias species(Clariidae) in Anambra River ,Nigeria. Ph.D. Thesis, University ofNigeria, Nsukka. 267 pp.EYO, J. E. (2002a). Congeneric Discrimination ofMorphometric Characters amongMembers of the Pisces Genus(Clariidae) in Anambra River,Nigeria. The Zoologist, Vol. 1(1): (inpress).EYO, J. E. (2002b). Conspecific discriminationin ratio morphometric charactersamong Members of the PiscesGenus: Clarias Scopoli, 1777. TheZoologist, Vol.1(1): (in Press).EYO, J. E. (2004). Differences in meristic countsof the genus Clarias (Pisces: Clariidae)in Anambra river, Nigeria. AnimalResearch International, 1(1 ): 31 – 35.EZENWAJI, H. M. G. (1986). The problems oftaxonomy of Clarias species (Pisces:Clariidae) of Africa and suggestionsfor the field worker. Journal ofScience Education , 2: 22 - 34.EZENWAJI, H. M. G. (1989). Aspects of theBiology of some “small” Clariasspecies in Anambra River Basin,Nigeria. Ph.D. Thesis. University ofNigeria, Nsukka. 224 pp.LAGLER, K. F., BARDACH, I. E., MILLER, R. R.and MAY PASSINO, D. R. (1977).Ichthyology. Second Edition. JohnWiley and Sons. 506 pp.LOWE-MCCONNELL, R. H. (1972). FreshwaterFishes of the Volta and Kainji lakes.Ghana University Press, Accra.MAYR, E. (1969). Principles of SystematicZoology. THM Edition, McGraw-HillCoy. Ltd. Bombay. 428 pp.SYDENHAM, D. H. J. (1978). Redescriptions ofthe type specimen of six Clariidspecies (Pisces) from Western Africa.Zoological Journal of the LinneanSociety , 64: 347-371.SYDENHAM, D. H. J. (1980). New species ofClarias from West Africa (Pisces,Clariidae). Revue Zoologica africana,94(3): 659 - 677.SYDENHAM, D. H. J. (1983). A key to the genusClarias in Nigeria. Memograph ofthe Department of Zoology,University of Ibadan, Nigeria. 2 pp.SYDENHAM, D. H. J. and OLAWOYE, O. F.(1981). A new species of Clariasfrom Nigeria (Pisces Clariidae).Revue Zoologica africana, 95(1):234-241.TEUGELS, G. G. (1980). Notes on the status andthe synonyms of Clarias pachynemaBoulenger 1903 (Pisces, Clariidae).Revue Zoologica africana, 94(3): 678- 692.TEUGELS, G. G. (1982a). Preliminary data of asystematic outline of the Africanspecies of the genus Clarias (Pisces,Clariidae). Revue Zoologica africana,96(1): 731 - 748.TEUGELS, G. G. (1982b). A systematic outline ofthe African species of the genusClarias (Pisces, Clariidae) withannotated biography. Annales dumusee Royal de L’ Afrique Centrale,Tervuren, Sciences Zoologyques.230 pp.TEUGELS, G. G. (1982c). Preliminary results of amorphological study of five nominalspecies of the genus Clarias (Clarias)(Pisces: Clariidae). Journal ofNatural History, 16: 439 - 464.TEUGELS, G. G. and ROBERTS, T. R. (1987).Silurus anguillaris Linnaeus, 1758,designation as type species ofClarias Scopoli 1777 and rediscoveryof holotype (Pisces, Clariidae).Zoological Journal of the LinneanSociety , 90: 95 - 98.
Animal Research International (2004) 1(1): 42 – 46 42QUANTITATIVE PROTEIN AND FAT METABOLISM IN WEST AFRICANDWARF SHEEP FED MARGARITARIA DISCOIDEA AS SUPPLEMENT1 OSAKWE, Isaac, Ikechukwu and 2 STEINGASS, Herbert1 Department of Animal Production and Fisheries, Ebonyi State University,PMB 053, Abakaliki, Ebonyi State, Nigeria.2 Institute of Animal Nutrition (450), 70599 Stuttgart GermanyCorresponding author: OSAKWE, Isaac, Ikechukwu. Department of Animal Production andFisheries, Ebonyi State University, PMB 053, Abakaliki, Nigeria. Phone: 234-43-300488, Email:osakwe_i@yahoo.comABSTRACTProtein and energy utilization and quantitative retention of protein, fat and energy wasinvestigated with twelve castrated Djallonke sheep averaging (20.0 ± 2.2kg BW) innitrogen and energy balance trials. Dried leaves of Margaritaria discoidea were offered assupplement at two levels (25% (diet 2) and 50% (diet 3) of DMI), replacing hay in abasal hay diet. The basal hay diet without supplementation was the control.Measurements were performed by means of nitrogen and carbon balances with the use ofindirect calorimetry. The digestibility of protein was not influenced by supplementation,while utilization of protein was influenced (P0.05) different betweentreatment. Diet 3 had a higher (P
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