week 3 01 - fresh forage
DESCRIPTION
Equine nutritionTRANSCRIPT
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DrJoAnneMurray(PhD,MSc,PgDip,PgCert,BSc(hons),BHSII,RNutr)Seniorlecturerinanimalhusbandryandnutrition
Equinenutrition
Nutrientsources
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LearningOutcomes
Bytheendofthissectionyoushouldbeableto:
Recogniseandcriticallyappraisenutrientsourcesforhorsesandponies
Nutrientsourcesforhorses
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Content
Forages Freshandconserved
Cerealgrains Cerealbyproducts Fibrousbyproducts Oilandoilbyproducts
Nutrientsourcesforhorses
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Forage
Constutestheporonofdietofallclassesofequids
Entiredietforequidsinwildandmanydomesticatedhorses
Grazedfreshorconserved Freshforage=grass Conserveforage=hay,haylage,silage,shortchopforages
Nutrientsourcesforhorses
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Freshforage
Naturalenvironmentforhorse=grazingonfreshpasture
Manydomescatedhorsessllspendmeatpasture
Somecompeonhorsesspendmuch
Naturaldiet=lowqualityherbage
Domescatedhorse=improvedpastures(nutrivevalue)
Nutrientsourcesforhorses
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Grasslands
Chemicalcomposition: Extremelyvariable CP=3to30% CF=20to40% WSC=3to40% Lipid=1.5to3.5%(unsaturated) Ash=4to8% DE(energy)=7.5to12MJ/kgDM(dependingontimeofyear) DEoflegumes=10to12MJ/kgDM Minerals=inpasturescontaininglegumes
Nutrientsourcesforhorses
IAGONota adhesivaCP = Crude ProteinCF = Contain FibreWSC = Water Soluble Carbohydrate
IAGONota adhesivaDE = Digestible Energy
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Theamountofnutritiongrasscanprovidedependson:
Timeofyear
Stageofgrowth
Environment
Plantspecies
Soiltype
Generalmanagementofthepasture
Numberofanimalsgrazingthearea
Nutrientsourcesforhorses
40%
Mature60%
Cell wall
Cell contents65%
Young 35%
Lignin
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Timeofyear: Rapidinspringandearlysummer Oftenmoreproducedthananimalscaneat Grazingpastureoftencroppedforconservationinspring Usedforgrazinginsummer Lessgrowthinautumn Verylittlegrowthinwinter Grounddamageinwinter Thusanimalshousedandfedconservedforages
Hay Silage Haylage Hightemperaturedried
Nutrientsourcesforhorses
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Nutritionalintakes
Nutrionalqualityandgrowthinspringandsummer
Difficulttoestimateamountofgrasseaten
Mosthorses/ponieswilleat~2%ofBWperday
Inspring/summercan=toomuchgrasscanbeconsumed 1acrewillfeed3to4horses
Excessgrass=conservedforwinterfeeding
Intakeslowerinwinter 1acrewillfeed1horseor2ponies
Nutrientsourcesforhorses
IAGONota adhesivaBW = Body Weight