Introduction: Definition of Palatability

Transcription

1 Mesurement of pltility of common ingredients used in feed mixes for lms nd ewes A. Mereu,, G. Molle, V. Giovnetti, M. Acciro, M. Decndi, A. Cnns Diprtimento di Scienze Zootecniche, Università di Sssri, Itly UCTA SA, Brcelon, Spin Agris Srdegn, DIPA, Olmedo, Itly Agris Srdegn, DIII, Ozieri, Itly Introduction: Definition of Pltility PAATABIITY: interreltionship etween flvor nd post-ingestive effects, influenced y: feeds chemicl chrcteristics nimls nutritionl stte nimls pst feeding experiences Most reserch crried out on forges No much literture ville on concentrtes

2 Pltility of concentrtes Feed neophoi often oserved with concentrtes: e.g. in diry sheep the chnge of concentrte or the insertion of new rw mteril in feed mixes often cuses feed refusls: Concentrtes re supplied lone only during the two dily milkings Short time ville to et the concentrtes during milking Economicl dmges for frmers (milk losses, tendency of using the sme concentrte) nd feed compnies (customers complins, limited use of certin ingredients) Ojective Evlution of the short term pltility of concentrte ingredientes on nive nd experienced sheep

3 Mterils nd methods: nimls femle Srd lms Age: ± d (± d fter wening) BW:.±. kg multiprous dry Srd ewes Age: ± yers BW:.±. kg BCS:. ±. PEVIOUS FEEDING EXPEIENCE ms: from wening to experiment ( dys): lflf hy + pelleted feed (rley, corn grins, nd whet grins; soyen mel, eet pulps, lflf dehydrted mel, whet rns, molsses (DM.%, CF.%, CP.%) Ewes: Psture + vrious types of concentrtes or concentrte mixes during milking time Mteril nd Methods: pltility tests Bsl diet: ryegrss hy nd rley mel+ure Trining period ( d): min pltility tests with rley mel Experimentl period ( d): min pltilty tests on feeds ground with mm screen sme feed in owls Alflf, dehyd. Corn gluten mel Corn grins Ot grins Pe grins Cnol mel Soyen hulls Soyen mel Soyen mel Sunflower mel Whet rns Whet grins

4 M & M - Pltility tests g ground feed MIN. test. AM EXIT EWES Bsl diet At. PM until. AM HAY AMBS Bsl diet At. PM until. AM Mteril nd Methods Experimentl feed DAY ANIMA ANIMA ANIMA ANIMA ANIMA ANIMA Experimentl design: two x tin squres Sttisticl nlysis GM for tin squre design nd non prmetric tests

5 esults: Trining period ms Brley DMI during trining g /d T rining dys Ewes Brley DMI during trining g /d T r in in g d y s esults: % of niml which % of nim ls Dehydr. lflf Ot grins Cnol mel Sunfll. mel Corn gluten Soyen hulls which didn t et t ll Whet grins Soyen Soyen Whet rns ms Pe grins Ewes Corn grins Animls tht did not et: ms =%, Ewes= %; P <. P <.

6 esults: DMI in min y ms P <. DMI, g in min c cd cd cdcd cd cd cd d Soyen mel Whet grins Pe grins Corn grins Soyen hulls Whet rns Soyen mel Cnol mel Sunflower mel Corn gluten mel Dehydrted lflf d Ot grins d Discussion: lms Intke of the experimentl feeds vried from high to low vlues in continuum, without cler cuts lck of experience? sensoril properties? The lms refused fmilir feed (dehydrted lflf) off-flvours?

7 esults: DMI in min y Ewes P <. DMI, g in min Whet grins Pe grins Corn grins Whet rns Corn gluten mel Ot grins Soyen mel Soyen hulls Sunflower mel Soyen mel Cnol mel Dehydrted lflf Discussion: Ewes The ewes showed mrked preference for feeds often supplied s single feed during milking eet pulps, whet grins, pe, nd corn grins ow intke or lmost totl rejection for the other feeds, including severl feeds commonly used for sheep feeding ut rrely used s single ingredients less prone thn lms to experience novel flvors. I et wht I know..

8 esults: DMI level of intke in min, = P <. ms Ewes m g/kg B W Soyen Whet grins Pe grins Corn grins Soyen hulls Whet rns Soyen Cnol mel Sunfl. mel Corn gluten Dehydr. lflf Ot grins Conclusions Wht re the cuses of the lrge differences in pltility? Arom? Tste? Texture? Experience? We hve mesured voltile compounds to identify possile importnt molecules Cn we improve the intke of the low pltle concentrtes? Mixes with pltle ingredients? Proper trining of the nimls? Fetl progrmming? Feed enhncers? See our tlk tomorrow (S.) on Flvours ffect feed rewrd in lms nd ewes fed cnol mel