Prediction of metabolizable energy and protein requirements for maintenance, gain and fiber growth of Angora goats

J. Luo, A. L. Goestch, I. V. Nsahlai, T. Sahlu, C. L. Ferrell, F. N. Owens, M. L. Galyean, J. E. Moore, Z. B. Johnson

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

A database was constructed for growing and mature Angora goats to estimate metabolizable energy (ME) and protein (MP) requirements for maintenance, whole BW gain (ADG), non-fiber tissue gain (TG) and fiber growth (clean fiber growth rate; CFGR). MP intake (MPI) was calculated from CP degradability properties and dietary proportions of feedstuffs. Variables, scaled by BW0.75, consisted of mean BW (kg), ME intake (MEI; kJ per day), MPI (g per day), ADG (g per day), TG (g per day; i.e., ADG corrected for grease fiber) and CFGR (g per day). For ME, the final simple regression equation for mature goats was MEI=533 (SE=18.8)+(43.2 (SE=4.77)×ADG) (n=77;R2=0.52). The final multiple regression equation for mature goats was MEI=473 (SE=49.85)+(37.2 (SE=6.97)×TG)+(157 (SE=52.5)×CFGR) (n=48;R2=0.53). For MP, the final simple regression equation with a development data set for growing and mature goats was MPI=4.30 (SE=0.286)+(0.318 (SE=0.0471)×ADG) (n=68;R2=0.41), which resulted in unbiased prediction of MPI in an evaluation data set. The final multiple regression equation for growing and mature goats was MPI=3.35 (SE=0.440)+(0.281 (SE=0.0486)×TG)+(1.65 (SE=0.394)×CFGR) (n=83;R2=0.46). In conclusion, ME requirements of mature Angora goats for maintenance, TG and CFGR were 473 kJ/kg BW 0.75, 37.2 and 157 kJ/g (113 kcal/kg BW0.75, 8.89 and 37.5 kcal/g), respectively. MP requirements of growing and mature Angora goats for maintenance, TG and CFGR were 3.35 g/kg BW0.75, 0.281 and 1.65 g/g, respectively.

Original languageEnglish
Pages (from-to)339-356
Number of pages18
JournalSmall Ruminant Research
Volume53
Issue number3
DOIs
StatePublished - Jul 2004

Keywords

  • Angora goats
  • ME requirements
  • MP requirements
  • Mohair

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