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5种常用粗饲料的肉羊瘤胃外流速率

DOI: 10.3969/j.issn.1006-267x.2014.07.033

Keywords: 肉羊,瘤胃降解率,外流速率,k值,粗饲料,秸秆

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Abstract:

本研究旨在测定5种常用粗饲料(羊草、麦秸、苜蓿、地瓜秧和玉米秸)的肉羊瘤胃外流速率。试验选用3只体况良好、体重[(65.0±1.0)]相近并装有永久性瘤胃瘘管的杜寒F1代去势公羊,利用重铬酸钾溶液标记饲料,火焰原子吸收光谱方法测定粪中铬的含量,通过数学方程计算5种粗饲料的瘤胃外流速率。结果表明:标记的粗饲料因种类不同,铬在粪中的排放高峰期不同,主要集中在20~28h。不同粗饲料的外流速率差异较大,羊草、麦秸、苜蓿、地瓜秧和玉米秸的瘤胃外流速率分别为3.92%/h、3.07%/h、4.30%/h、4.63%/h和3.16%/h,且与饲料原料中粗蛋白质的含量有强相关(R2=0.9035,P=0.0131)。总之,粗饲料种类不同,瘤胃的外流速率不同。本研究得出的羊草、麦秸、苜蓿、地瓜秧和玉米秸肉羊瘤胃外流速率可在相关研究中应用。

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