Evaluation of the trace mineral status of ruminants in northeast Mexico

[摘要] AstudywasconductedtodeterminemicromineralstatusofgrazinglivestockinthreesemiaridregionsinnortheastMexico.Soil,forage,blood,hair,andliversampleswerecollectedfromatotalof13differentfarms.Percentagesofmicromineralsbelowlowcriticallevels(inparentheses)andsuggestiveofadeficiencyforlivestockinregions1,2and3,respectively,wereasfollows:soil(ppm)-Fe(2.5)100,100,100;Zn(1.0)100,100,100;Cu(0.3)100,100,100;Mn(5.0)100,100,100;forage(ppm)-Fe(50)5,0,0;Zn(30)38,88,63;Cu(10)86,100,75;Mn(40)33,63,0;Co(0.1)33,13,13;bloodplasma(ppm)-Zn(0.6)30,6,31;Cu(0.65)26,30,67;Se(0.03)0,0,0.Percentagesofmicromineralsabovehighcriticallevels(inparentheses)andsuggestiveofatoxicityforlivestockinregions1,2and3,respectively,wereasfollows:forage(ppm)-Se(2.0)0,33,0;Mo(6.0)38,13,50;hair(ppm)-Se(5.0)0,34,0.ThemicromineralsmostlikelytobedeficientintheNuevoLeonareawereCuandZn,withMnandCobeingmildlydeficient.Seleniumwasnotpresentintoxiclevels,whereasMowaspresentinforagesinsufficientlyhighconcentrationstobepotentiallytoxic.InZacatecas,themicromineralsmostlikelytobedeficientwereCu,Zn,andMn.SeleniumconcentrationsinforagesamplesfromZacatecaswerehighenoughtobeconsideredtoxic,whereasMoconcentrationswereonlymildlyelevated.MicromineralsmostlikelytobedeficientintheCoahuilaregionwereCuandZn.Cobalt,Mn,FeandSeconcentrationswerenormal.However,Molevelsinforageswerethehighestofallthreeregionsandshouldbeconsideredtoxic.

[学科分类] 农业科学（综合）