title: Determination of endogenous faecal phosphorus loss in goats.
abstract: 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.
authors.affiliation: Key Laboratory of Agro-Ecological Engineering, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, PR China.
authors.forename: Grace Oluwatoyin
authors.initials: GO
authors.lastname: Tayo
authors.forename: Shao Xun
authors.initials: SX
authors.lastname: Tang
authors.forename: Zhi Liang
authors.initials: ZL
authors.lastname: Tan
authors.forename: Zhi Hong
authors.initials: ZH
authors.lastname: Sun
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Chuan She
authors.initials: CS
authors.lastname: Zhou
authors.forename: Xue Feng
authors.initials: XF
authors.lastname: Han
mesh_terms: 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*
chemical_list: D016226:Phosphorus, Dietary; D010758:Phosphorus