Determination of endogenous faecal phosphorus loss in goats
Determination of endogenous faecal phosphorus loss in goats
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DOI：
10.1080/17450390902723893
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发表时间：
2009-04
影响因子：
2
通讯作者：
G. Tayo;S. Tang;Z. Tan;Zhihong Sun;Min Wang;C. Zhou;Xuefeng Han
中科院分区：
文献类型：
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作者：
G. Tayo;S. Tang;Z. Tan;Zhihong Sun;Min Wang;C. Zhou;Xuefeng Han
采用4 × 4拉丁方试验，采用回归法和代入法测定了饲粮磷水平分别为0.129、0.140、0.162和0.180%的玉米秸秆和精料对4只浏阳黑羊的内源粪磷损失。治疗对粪、尿磷排泄量、磷表观消化率、磷滞留率和唾液磷分泌均无显著影响。粪便表观可消化磷（Y, g/kg DMI）与磷摄入量（X, g/kg DMI）呈线性关系，Y = 0.4799X−0.9209,r2 = 0.9869, （P < 0.05）。回归法和代入法测定的磷真消化率分别为48.0%和48.9%；记录的内源粪磷损失量分别为0.92和0.93 g/kg DMI。本研究证明了回归法和替代法在估算山羊磷真消化率和内源性粪磷损失量方面的潜力。
Four black Liuyang wether goats were fed with corn stover and concentrate formulated to contain four levels of dietary phosphorus (P), including 0.129, 0.140, 0.162 and 0.180% of P. In a 4 × 4 Latin square experiment the endogenous faecal P loss was determined by the regression technique and the substitution method. Treatment effects on faecal and urinary P output, apparent P digestibility and P retention, and saliva P secretion were not significant. A linear relationship was observed between apparent faecal digestible P (Y, g/kg DMI) and P intake (X, g/kg DMI), which was described by the equation: Y = 0.4799X −0.9209, r2 = 0.9869, (p < 0.05). The true P digestibility determined by the regression technique and the substitution method amounted to 48.0 and 48.9%, respectively; the recorded endogenous faecal P losses were 0.92 and 0.93 g/kg DMI, respectively. The study demonstrated the potential of the regression method as well as the substitution method for estimation of true P digestibility and endogenous faecal P losses in goats.