Zinn R A, Barajas R, Montaño M, Shen Y
Imperial Valley Agricultural Center, University of California, El Centro 92243, USA.
J Anim Sci. 1996 Oct;74(10):2331-5. doi: 10.2527/1996.74102331x.
Four Holstein steers (222 kg) with cannulas in the rumen and proximal duodenum were used in a crossover design experiment to evaluate the energy and protein value of dehydrated poultry excreta (DPE). Dietary treatments contained (DM basis) 4% alfalfa hay, 8% sudangrass hay, 49% flaked barley, 8% cane molasses, 3% yellow grease, .8% urea, 1.4% limestone, .3% mineral salt, and .4% chromic oxide, plus 25% of either tapioca pellets or DPE. The DPE contained 42% ash and 27% CP (6% true protein). Substituting DPE for tapioca decreased the DE value of the diet (P < .01). The estimated DE value of the DPE was 1.36 Mcal/kg (.34 Mcal NEm/ kg). There were no treatment effects (P > .10) on microbial N flow to the small intestine or ruminal microbial efficiency (grams of microbial N/kilogram of OM fermented). The addition of DPE increased (P < .05) the flow of non-ammonia and feed N to the small intestine. The estimated ruminal escape N value of DPE was 22%, although very little of this was true protein. Dehydrated poultry excreta did not increase (P > .10) flow of alpha-amino N to the small intestine. Ruminal degradability of uric acid was 96%. Total tract true digestibility of N in DPE was 84%. It is concluded that the NE value of DPE is markedly overestimated in current tables of feeding standards. Less than 10% of the N in DPE escapes the rumen as true protein N.
选用4头装有瘤胃和十二指肠近端套管的荷斯坦公牛（体重222千克），采用交叉设计实验来评估脱水家禽粪便（DPE）的能量和蛋白质价值。日粮处理（以干物质计）包括4%苜蓿干草、8%苏丹草干草、49%压片大麦、8%甘蔗糖蜜、3%黄油脂、0.8%尿素、1.4%石灰石、0.3%矿物质盐、0.4%氧化铬，外加25%的木薯颗粒或DPE。DPE含42%灰分和27%粗蛋白（6%真蛋白）。用DPE替代木薯颗粒降低了日粮的消化能值（P<0.01）。DPE的估计消化能值为1.36兆卡/千克（0.34兆卡净能/千克）。对小肠微生物氮流量或瘤胃微生物效率（每千克发酵有机物质的微生物氮克数）没有处理效应（P>0.10）。添加DPE增加了（P<0.05）非氨态氮和饲料氮向小肠的流量。DPE的瘤胃逃逸氮估计值为22%，不过其中很少是真蛋白。脱水家禽粪便没有增加（P>0.10）α-氨基氮向小肠的流量。尿酸的瘤胃降解率为96%。DPE中氮的全肠道真消化率为84%。得出的结论是，在当前的饲养标准表中，DPE的净能值被明显高估。DPE中不到10%的氮以真蛋白氮的形式从瘤胃逃逸。
