Determination of endogenous faecal phosphorus loss in goats.
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 x 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 = 0.4799 X -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.
Tayo
Grace Oluwatoyin
GO
Key Laboratory of Agro-Ecological Engineering, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, PR China.
Tang
Shao Xun
SX
Tan
Zhi Liang
ZL
Sun
Zhi Hong
ZH
Wang
Min
M
Zhou
Chuan She
CS
Han
Xue Feng
XF
D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary; D004063:Digestion / Q000502:physiology; D005243:Feces / Q000737:chemistry*; D006041:Goats / Q000502:physiology*; D008297:Male; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism*; D016226:Phosphorus, Dietary / Q000378:metabolism*
D016226:Phosphorus, Dietary; D010758:Phosphorus