Blasi D A, Klopfenstein T J, Drouillard J S, Sindt M H
University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1991 Mar;69(3):1272-8. doi: 10.2527/1991.6931272x.
The objectives of this research were to determine 1) the effects of hydrolysis time on feather meal (FTH) protein digestion and ruminal escape and 2) whether adding blood meal (BM) to FTH evoked a complementary response in animal performance. A lamb digestion trial was conducted to estimate true protein digestibility of soybean meal (SBM), BM, and FTH hydrolyzed for 10, 12, 15, or 18 min. Ruminal escape was estimated in situ. Two 94-d growth trials were conducted using 60 growing calves (226 kg) per trial to evaluate urea, FTH, BM, and 87.5:12.5, 75:25, and 50:50 combinations (CP percentage basis) of FTH:BM. There were small numerical differences in estimated escape of protein from the rumen and DM and protein digestibilities due to hydrolysis time. True protein digestibility of the 10- and 18-min samples was 5% higher (P less than .05) than for the 12- or 15-min FTH samples. In the growth trial, the slope-ratio technique showed that the most efficiently used protein supplement was 100% BM (protein efficiency = 2.45 +/- .19). No differences (P = .30) in protein efficiency were observed among supplements containing various combinations of FTH:BM. There was a quadratic (P less than .01) response to the level of BM, indicating a complementary effect. The largest complementary effect occurred at the 12.5% level of the BM addition. There were no nutritionally important effects of hydrolysis time between 10 and 18 min. Furthermore, supplements can be formulated more economically using small amounts of BM with FTH without compromising biological efficiency.
1）水解时间对羽毛粉（FTH）蛋白质消化率和瘤胃逃逸率的影响；2）向FTH中添加血粉（BM）是否会在动物生产性能上产生互补效应。进行了一项羔羊消化试验，以估计水解10、12、15或18分钟的豆粕（SBM）、BM和FTH的真蛋白消化率。通过原位法估计瘤胃逃逸率。进行了两项94天的生长试验，每次试验使用60头生长中的犊牛（226千克），以评估尿素、FTH、BM以及FTH与BM按87.5:12.5、75:25和50:50比例（基于粗蛋白百分比）混合的组合。由于水解时间的不同，瘤胃蛋白质估计逃逸量、干物质和蛋白质消化率存在微小的数值差异。10分钟和18分钟样品的真蛋白消化率比12分钟或15分钟的FTH样品高5%（P小于0.05）。在生长试验中，斜率比技术表明，最有效利用的蛋白质补充剂是100%的BM（蛋白质效率=2.45±0.19）。在含有不同FTH与BM组合的补充剂之间，未观察到蛋白质效率的差异（P=0.30）。对BM水平存在二次响应（P小于0.01），表明存在互补效应。最大的互补效应出现在添加12.5%BM的水平。在10至18分钟的水解时间之间，没有营养上重要的影响。此外，使用少量BM与FTH配制补充剂可以更经济，且不会影响生物学效率。
