Taxonomy and chemical composition of fallen leaves of tree and shrub species consumed by cattle in the dry season in the dry tropical forest in Michoacán, México

摘要

Thechemicalcompositionofthefallingleavesof40speciesthatwereconsumedbythecattleindryseasonwasdetermined.Themethodologythatwasusedtoidentifiedthespecieswithpotentialforagewasbyanimalpreference,whichwascarriedoutbydirectvisualobservationtwodaysaweekwithtwosamplesperday,oneinthemorningandoneintheafternoon.Samplesofeveryconsumedspeciewerecollectedforalatertaxonomicidentification.Proteinvaluevariesfrom4.91%forEuphorbiasp.to22.48%forPithecellobiumunguiscati,withanaverageof10.01%#177;3.11%;the77.5%hasavalueabove8%.ThehighestcontenedoforganicmatterwasfoundinCaesalpiniaeriostachyswith95.22%andlowestCordiasp.with81.08%andanaverageof90.02%#177;3.27%.Them#237;nimumvalueforNeuterFiber(FDN)was22.60%inSpondiaspurpureaand55.60%inCaseariadolicophylla,withanaverageof39.25%#177;7.59.ForAcidFiber(FDA)theaveragewas31.16%#177;8.03,wherethemaximumvaluewas52.61%forAmphipterygiumadstringensandaminimumvalueof13.67%forMimosaegregia,finallywithrespectofnitrogeninFDAtheaveragewas1.45%#177;0.48%,theminimumvaluewasshowedbySpondiaspurpureaspeciewith0.64%andthemaximumwaspresentedbyRandiaechinocarpawithavalueof2.65%.TheseresultsdemonstratethatthearborealandshrublikepresentinDrytropicalrepresentsapotentialsourceoffoodandaproteinsupplementforlivestock,wichisinthemajorityofthecasesaboveofthebovinerequerimentsandabovetheproteincontentinthegrasses,especiallyindryseasonwhentheyhadcompletedtheircycle.