Skip to main content
ARS Home » Research » Publications at this Location » Publication #166431
Title: PREDICTION OF METABOLIZABLE ENERGY AND PROTEIN REQUIREMENTS FOR MAINTENANCE, GAIN AND FIBER GROWTH OF ANGORA GOATS

Author
item LUO, J - NW SCI-TECH UNIV, CHINA
item GOESTCH, A - LANGSTON UNIVERSITY, OK
item NSAHLAI, I - UNIV OF NATAL, S. AFRICA
item SAHLU, T - LANGSTON UNIVERSITY, OK
item FERRELL, CALVIN
item OWENS, F - PIONEER HI-BRED INTERNAT.
item GALYEAN, M - TEXAS TECH UNIV, LUBBOCK
item MOORE, J - UNIV FLORIDA, GAINSEVILLE
item JOHNSON, Z - UNIV. OF ARKANSAS

Submitted to: Small Ruminant Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/9/2004
Publication Date: 7/4/2004
Citation: Luo, J., Goestch, A.L., Nsahlai, I.V., Sahlu, T., Ferrell, C.L., Owens, F.N., Galyean, M.L., Moore, J.E., Johnson, Z.B. 2004. Prediction of metabolizable energy and protein requirements for maintenance, gain and fiber growth of angora goats. Small Ruminant Research. 53:339-356.

Interpretive Summary: Based on databases of treatment mean observations from the literature and regression analyses, the metabolizable energy (ME) and metabolizable protein (MP) requirements for maintenance, whole body weight (BW) gain, tissue gain and fiber growth of Angora goats were determined. The metabolizable energy (ME) requirement for maintenance of mature Angora goats from simple and multiple regression analyses [at 0 ADG and 0 tissue gain (TG) and clean fiber growth rate (CFGR), respectively] were 533 and 473 kJ/kg BW0.75, respectively; ME requirements for whole BW gain, TG and CFGR were 43.2, 37.2 and 157 kJ/g of average daily gain (ADG), TG and CFGR, respectively. The MP requirement for maintenance of growing and mature Angora goats from simple and multiple regression analyses (at 0 ADG and 0 TG and CFGR, respectively) was 4.30 and 3.35 g/kg BW0.75, respectively, and MP requirements for whole BW gain, TG and CFGR were 0.318, 0.281 and 1.65 g/g of ADG, TG and CFGR, respectively.

Technical 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) x 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) x TG) + (157 (SE = 52.5) x 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) x 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) x TG) + (1.65 (SE = 0.394) x CFGR) (n = 83; R2 = 0.46). In conclusion, ME requirements of mature Angora goats for maintenance, TG and CFGR were 473 kJ/kg BW0.75, 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.