摘要
用铬标记饲料的方法测定了不同细度、不同种类粗饲料通过瘤胃的部分外流速度 Kp。试验结果表明,标记饲料的细度明显影响 Kp 的测定结果。饲料颗粒越细,通过瘤胃的外流速度越快。对于粗饲料,测定 Kp 时标记粒度应在流出瘤胃的临界粒度1.19mm 以下才具有代表性。不同种类的粗饲料,其 Kp 值不同。羊草、高粱青贮和豆腐渣的 Kp 值分别为0.0314、0.0253、0.0399h^(-1)。
Three rumen—fistulated steers were used for studying the ruminal passage rate(Kp)of dif- ferent roughages with different particle sizes.The results showed that the particle sizes of labelled feed markedly affected the roughages'Kp value determined,and with the decreasing of the parti- cles'size,the rumen fractional outflow rate of feeds increased.It was reasonable that the labelling particle size was choosed less than the critical size for particles leaving the rumen(1.19 mm)a- coording to this test.The Kp values for chinese wildrye,sorghum silage and soybian curd residue were 0.0314,0.0253,0.0399h^(-1) respectively.
关键词
青粗饲料
外流速度
牛
Roughages
Rumen
Passage rate
Steers
