Shahzad Muhammad A, Phillips Clive J C, Sarwar Muhammad
Institute of Animal Nutrition and Feed Technology, University of Agriculture, Faisalabad, Pakistan.
Trop Anim Health Prod. 2012 Jun;44(5):947-52. doi: 10.1007/s11250-011-9991-1. Epub 2011 Nov 19.
Urea is a common ingredient of the diets of intensively fed lambs, but is increasingly required for industrial processes. Maize steep liquor (MSL) is a by-product of maize grain degradation to produce starch that may be a suitable replacement. Fifty growing lambs were fed on equinitrogenous diets in which between 0% and 80% of the urea was replaced by MSL; their growth and metabolism were recorded over 70 days. Increasing replacement of urea by MSL increased feed intake and nutrient digestibilities, leading to increased growth rates, more efficient feed conversion, and increased nitrogen retention. Concentrations of triiodothyroxin, thyroxin, glucose, and methionine were increased by replacement of urea by liquor, and plasma urea was reduced. This study suggests that MSL is a suitable replacement for up to 80% of urea in the diet of rapidly growing lambs.
尿素是集约化饲养羔羊日粮中的常见成分，但工业生产对其需求日益增加。玉米浆（MSL）是玉米籽粒降解生产淀粉过程中的副产品，可能是一种合适的替代品。选用50只生长中的羔羊，给它们饲喂等氮日粮，其中0%至80%的尿素被玉米浆替代；在70天内记录它们的生长和代谢情况。用玉米浆替代尿素的比例增加，会使采食量和养分消化率提高，从而导致生长速度加快、饲料转化率提高以及氮保留增加。用玉米浆替代尿素会使三碘甲状腺原氨酸、甲状腺素、葡萄糖和蛋氨酸的浓度升高，血浆尿素降低。本研究表明，在快速生长羔羊的日粮中，玉米浆可替代高达80%的尿素。
