Douglas M W, Parsons C M
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Poult Sci. 1999 Apr;78(4):556-60. doi: 10.1093/ps/78.4.556.
Previous results indicated that performance of chicks fed a high level (15%) of rendered spent hen meal (SHM) was lower than performance of chicks fed a corn-soybean meal (SBM) diet. The latter difference was hypothesized to be due to variation in digestible amino acid (AA) levels among the diets. This study evaluated diets containing SHM formulated on an equivalent total AA basis vs an equivalent digestible AA basis compared to a corn-SBM diet. Three SHM (A, B, and C), produced in commercial rendering plants, were evaluated. Mean true digestibility coefficients (percentages) for 17 AA in SHM A, B, and C were 73.1, 63.4, and 75.5, respectively. In two chick trials, 1-wk-old New Hampshire x Columbian male chicks were fed from 8 to 20 d of age a corn-SBM diet or diets containing 15% SHM formulated to be equal in total or digestible AA to the corn-SBM diet. All diets contained 21.5% CP and 3,200 kcal TME(n)/kg. Chicks fed 15% SHM (A, B, or C) diets formulated on a total AA basis had significantly lower (P < 0.05) weight gain and feed efficiency than chicks consuming the corn-SBM diet. Formulating diets containing SHM B or SHM C on a digestible AA basis yielded growth performance equivalent to chicks fed the corn-SBM diet. Growth performance of chicks fed the SHM A diet formulated on a digestible AA basis was greater (P < 0.05) than that obtained from the SHM A diet formulated on a total AA basis but was still lower than performance of chicks consuming the corn-SBM diet. Additional AA and energy supplementation of the SHM A diet formulated on a digestible AA basis only partially alleviated the latter performance difference. The results of this study indicated that formulation of diets containing SHM on a digestible AA basis is superior to formulation on a total AA basis and that 15% inclusion of two of the three SHM in chick diets had no detrimental effects on performance if the diets were formulated to contain adequate levels of digestible AA.
先前的结果表明，饲喂高水平（15%）的经加工的淘汰母鸡粉（SHM）的雏鸡的生长性能低于饲喂玉米-豆粕（SBM）日粮的雏鸡。推测后者的差异是由于日粮中可消化氨基酸（AA）水平的变化所致。本研究评估了与玉米-SBM日粮相比，基于总氨基酸等量或可消化氨基酸等量配制的含SHM的日粮。对在商业加工厂生产的三种SHM（A、B和C）进行了评估。SHM A、B和C中17种氨基酸的平均真消化率系数（百分比）分别为73.1、63.4和75.5。在两项雏鸡试验中，1周龄的新罕布什尔×哥伦比亚雄性雏鸡在8至20日龄期间饲喂玉米-SBM日粮或含15% SHM的日粮，这些日粮在总氨基酸或可消化氨基酸方面与玉米-SBM日粮相等。所有日粮均含有21.5%的粗蛋白和3200千卡的真代谢能（TME(n)）/千克。饲喂基于总氨基酸配制的15% SHM（A、B或C）日粮的雏鸡，其体重增加和饲料效率显著低于（P<0.05）采食玉米-SBM日粮的雏鸡。基于可消化氨基酸配制含SHM B或SHM C的日粮，其生长性能与饲喂玉米-SBM日粮的雏鸡相当。饲喂基于可消化氨基酸配制的SHM A日粮的雏鸡的生长性能高于（P<0.05）基于总氨基酸配制的SHM A日粮，但仍低于采食玉米-SBM日粮的雏鸡。仅对基于可消化氨基酸配制的SHM A日粮额外补充氨基酸和能量，只能部分缓解后者的生长性能差异。本研究结果表明，基于可消化氨基酸配制含SHM的日粮优于基于总氨基酸配制，并且如果日粮配制含有足够水平的可消化氨基酸，在雏鸡日粮中添加三种SHM中的两种至15%对生长性能没有不利影响。
