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20~35kg杜泊×小尾寒羊F1代公羔钙、钠、钾和镁生长需要量

DOI: 10.3969/j.issn.1006-267x.2013.07.011

Keywords: 育肥羔羊,矿物质,组织生长,需要量,比较屠宰

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Abstract:

本试验旨在探讨20~35kg杜泊×小尾寒羊F1代杂交公羔羊钙、钠、钾、镁生长需要量。采用比较屠宰试验,分别在羔羊体重20、28和35kg时屠宰,测定动物体组织器官的钙、钠、钾、镁含量,建立数学模型对体内矿物质含量变化规律及需要量进行预测。结果显示,羔羊在20~35kg体重阶段,肌肉生长速度较稳定,骨骼生长速度逐渐减慢,而体内脂肪组织在迅速增加;羔羊体内矿物质含量与空腹体重(EBW)具有高度相关性(R2=0.84~0.98),钙、钠、钾、镁净生长需要量(NRG)预测公式分别为NRGCa=15.26EBW-0.171,NRGNa=1.67EBW-0.085,NRGK=1.94EBW0.023和NRGMg=0.34EBW0.051。由此可计算得出,杜泊×小尾寒羊F1代羔羊在20~35kg阶段,以空腹体增重(EBG)表示,机体钙、钠、钾、镁的NRG分别为8.56~9.36g/kgEBG、1.15~1.20g/kgEBG、2.07~2.09g/kgEBG和0.39~0.40g/kgEBG;以体增重(BWG)表示,分别为7.18~8.18g/kgBWG、0.96~1.05g/kgBWG、1.76~1.81g/kgBWG和0.34g/kgBWG。

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