Digestibility and nitrogen retention in Mong Cai pigs fed sugar palm (Borassus flabiller) juice and fresh water fish ensiled with rice bran and sugar palm syrup

摘要

Thepresentstudyaimedattestingdifferentcombinationsofsugarpalmsyrupandcassavarootasadditivesforensilingfreshwaterfishandtodeterminethenutritivevalueforpigsofthefishsilage.nbsp;Smallfishnbsp;weremixedwithricebran(65freshfish,30ricebran)andsixcombinationsofsugarpalmsyrupandchoppedfreshcassavaroot(4.5and0.00;3.6and1.1;2.7and2.1;1.8and3.1;0.9and4.2;0.00and5.2,respectively.Themixtureswereplacedinplasticbottles,whichweresealedhermeticallyafterpressingthecontentstoremoveair. Therewere4replicatesforeachsamplingtimeat5,10,15,20,25and30daysafterensiling.nbsp;Largerquantities(about9kg)ofthesamemixtureswereensiledfor14daysandfedasasupplementtodiluted(40Brix)sugarpalmsyrup.FourMongCaimalepigsnbsp;wereallocatedtothesixdiets.nbsp;Thesugarpalmsyrupandthefishsilagesweremixedintheratioof64:36(freshbasis)andfedadlibitum.ThepHofthemixtureswasintherangeof6.3to6.5beforeensilingandhadfallento4.5to5.0afterensilingforfivedays,remainingstableuntil30days.TheaveragepHmeasuredat5-dayintervalsbetween5and30dayswas4.51forthesilagewiththehighestproportionofpalmsyrup(4.5)andwaslowerthanforalltheothersilages(rangeof4.96to5.06). Allthesilageswerewellpreservedasindicatedbythesmellandabsenceofspoilage.Therewasnoapparenteffectofthedifferentproportionsoftheadditives(palmsyrupandchoppedfreshcassavaroot)ontheapparentdigestibilityofdrymatterandofnitrogen,oronnitrogenretention.Thehighvaluesforapparentdigestibilityofnitrogen(range80to88)andnitrogenretention(rangeof36to54ofnitrogenintake)indicatethatthemethodofconservationhadretainedthenutritivevalueoftheoriginalmaterial.nbsp;nbsp;Itisconcludedthatensilingsmallfreshwaterfishwithricebran(50ofthefreshweightofthefish)andeithersugarpalmsyrupsyrup(7oftheweightofthefish)orfreshlychoppedcassavaroot(8oftheweightoffish),orcombinationsofthetwoadditives,isasatisfactorymethodofpreservationwhichretainsthenutritivevalueofthefishprotein.nbsp;