培育更好的羔羊：营养和饲料效率在生长和胴体性状中的作用.pdf

1、GROWING BETTER LambsMELINDA ELLISON,PHDExtension Range Livestock and Sheep SpecialistRole of nutrition&feed efficiency in growth&carcass traitsForageConcentrate(Murphy et al.,1994,Scaglia et al.,2012;Realini et al.,2004;Duckett et al.,2007;Neel et al.,2007)Finishing Diet Carcass Quality Protein-rich

2、 Energy-dense Low NDFAverage Daily GainFeed ConversionHot Carcass WeightDressing PercentageIntermuscular Fat Eating Experience Lower Quality High FiberEnergy IntakeCarcass FatConformation(Haddad et al.,2001;Safari et al.,2001;Atti et al.,2004;Hossain et al.,2023)Alternative Feed SourcesBypass Protei

3、nSupplementation with bypass protein improves muscle accretion(Reid et al.,2008)Bypass Protein(RUP)Examples:Heat treated soybean meal,cottonseed meal,distillers grains,corn gluten meal,canola meal,sunflower meal,fish meal,blood mealProvide essential amino acid supplies at gut level.Increased muscle

4、mass accretion Higher weight gainCrushed wheat(68%),soybean meal(30%)added to pasture Increased tenderness,juiciness,flavor,color and overall acceptability(Erasmus et al.1992;McClure et al.1994;Urbaniak 1995;Solomon et al.2008;Bruno et al.2009)Hossain et al,2023Alternative Feed SourcesBypass Protein

5、Supplementation with bypass protein improves muscle accretion Unsaturated Fatty AcidsDiets enriched with unsaturated fatty acids(e.g.,flaxseed,linseed,licuri cake)improve meat fatty acid profile,flavor,color,tenderness(Santos-Silva et al.,2002;Costa et al.,2018;Miltko et al.,2018;Hou et al.,2023)(Re

6、id et al.,2008)Examples:Linseed,Flaxseed,fish oilMeat more favorable through improved:Levels of n-3 PUFAs Eicosapentaenoic acid(EPA)Docosahexaenoic acid(DHA)Meat tenderness Lipid shelf-life/stability(decrease lipid oxidation)Flavor and overall acceptabilityFatty Acid SupplementationElmore et al.,200