Prediction of fecal crude protein excretion of goats

被引:31
作者
Moore, JE
Goetsch, AL [1 ]
Luo, J
Owens, FN
Galyean, ML
Johnson, ZB
Sahlu, T
Ferrell, CL
机构
[1] Langston Univ, E Kika de la Garza Amer Inst Goat Res, POB 730, Langston, OK 73050 USA
[2] Northwest Sci Tech Univ Agr & Forestry, Col Anim Sci & Technol, Yangling 712100, Shaanxi, Peoples R China
[3] Pioneer HiBred Int Inc, Crop Genet Res & Dev, Johnston, IA 50131 USA
[4] Texas Tech Univ, Dept Anim Sci & Food Technol, Lubbock, TX 79409 USA
[5] Univ Arkansas, Dept Anim Sci, Fayetteville, AR 72701 USA
[6] US Meat Anim Res Ctr, Clay Ctr, NE 68933 USA
关键词
goats; crude protein; digestibility;
D O I
10.1016/j.smallrumres.2004.04.008
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
A database of 622 treatment mean observations of the dietary concentration of CP and apparently digestible CP (DCP) from 146 publications was used to estimate true digestibility of CP and metabolic fecal CP (MFCP) in goats. A regression of DCP against CP with the entire database yielded the equation: DCP = 0.8566 x CP (%DM) - 2.697 (r(2) = 0.851, root mean square error = 1.58). There were some observations with lower than predicted DCP, some of which were with diets containing browse. Therefore, observations with residuals <1.58 were deleted, resulting in the equation: DCP = 0.8831 x CP(%DM) - 2.67(r(2) = 0.952, root mean square error = 0.86; n = 562); estimates of MFCP and true CP digestibility were considered the Y intercept and slope, respectively. To address variables of the entire database with less than expected DCP, the database was split into a subset to develop equations (60% of observations), with inclusion of additional variables such as DM intake and dietary concentrations of forage and browse, and one to evaluate. However, multiple regression equations did not greatly improve prediction, with lower than predicted DCP appearing a consequence of depressed true CP digestibility rather than increased MFCP. In conclusion, for goats consuming diets without browse, 0.88 and 2.67% DM appear appropriate estimates of true CP digestibility and MFCP, respectively, similar to values for other ruminant species. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:275 / 292
页数:18
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