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- W2100783497 abstract "A database of 349 treatment mean observations, representing 3404 goats from 73 publications between 1973 and 2003, was used to determine metabolizable protein (MP) requirements for maintenance (MPm) and growth (MPg) of goats. Published CP degradation properties of feedstuffs and proportions of dietary ingredients were used to estimate MP intake (MPI, g/day), which was regressed against ADG, with both variables scaled by BW0.75. Goats were classified as meat (≥50% Boer; 60 observations), dairy (selected for milk production; 129 observations) and indigenous (160 observations) biotypes. Because of differences (P<0.01) among biotypes in slopes, separate regressions were initially performed—meat: MPI=2.55(S.E.=0.360)+(0.441(S.E.=0.0276)×ADG)(n=58;R2=0.82); dairy: MPI=2.83(S.E.=0.344)+(0.299(S.E.=0.0238)×ADG)(n=123;R2=0.57); and indigenous: MPI=3.23(S.E.=0.212)+(0.281(S.E.=0.0304)×ADG)(n=152;R2=0.36). Intercepts did not differ among biotypes (P=0.37), but the slope for meat goats differed (P<0.01) from those for dairy and indigenous goats; therefore, data sets for dairy and indigenous goats were pooled and split into development (n=150) and evaluation (n=125) subsets. Using the equation derived from the development data subset for dairy and indigenous goats (i.e., MPI=3.14(S.E.=0.189)+(0.285(S.E.=0.0168)×ADG)(n=144;R2=0.67)), MPI for the evaluation subset was predicted; regressing observed against predicted MPI of the evaluation data subset resulted in an intercept and slope not different from 0 and 1, respectively (P>0.05). The equation from the development subset for dairy and indigenous goats was compared with the equation from the meat goat data set; there was a difference (P<0.01) in slopes but not in intercepts (P=0.25). Therefore, a dummy variable (D=1 for meat goats and 0 otherwise) was used to develop a common intercept equation: MPI=3.07(S.E.=0.165)+(0.290(S.E.=0.0150)×ADG)+(0.114(S.E.=0.0162)×D×ADG)(n=202;R2=0.75). In conclusion, based on regression of MPI against ADG, MPm was 3.07 g/kg BW0.75 for all biotypes of growing goats, and MPg was 0.404 and 0.290 g/g ADG for meat and other (dairy and indigenous) goats, respectively." @default.
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- W2100783497 date "2004-07-01" @default.
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- W2100783497 title "Metabolizable protein requirements for maintenance and gain of growing goats" @default.
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- W2100783497 doi "https://doi.org/10.1016/j.smallrumres.2004.04.003" @default.
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