Metabolizable protein requirements for maintenance and gain of growing goats

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• 作者：Luo ; J. ; Goetsch ; A.L. ; Nsahlai ; I.V. ; Sahlu ; T. ; Ferrell ; C.L. ; Owens ; F.N. ; Galyean ; M.L. ; Moore ; J.E. ; et. al.
• 关键词：Goat ; Metabolizable protein ; Maintenance ; Growth
• 刊名：Small Ruminant Research
• 出版年：2004
• 出版时间：July, 2004
• 年：2004
• 卷：53
• 期：3
• 页码：309-326
• 全文大小：207 K

文摘

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 (MP_m) and growth (MP_g) 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 BW^0.75. 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