生长绵羊的营养物质转化规律研究

STUDY ON THE PATTERN OF NUTRIENT CONVERSION IN GROWING SHEEP

本文以毛用型中国美利奴、毛肉兼用型东北细毛羊和肉毛兼用型长毛半血羊育成公羔为对象,运用消化代谢试验、间接测热和同位素稀释技术等手段,探讨营养物质在体内的转化规律,着重研究了养分消化、代谢、分配和沉积率及其受遗传和营养的影响。

The study was carried out on three genetically different types of ram lambs,Chinese Merino as wool sheep, Northeast Fine-wool sheep as wool-mutton sheep and Longwool Crossbred as mutton-wool sheep. The efficiencies of conversion of feed to wool and body tissues, particularly in the process of digestion, metabolism, partition and deposition of N and energy, were determined by the dilution technique of hydrogen isotope, indirect calorimetry, digestion trial, N balance and wool analysis. Results showed that Chinese Merino had the greatest capacity for total N utilization and wool production, Northeast Fine-wool sheep had the strongest ability to utilize roughage at low level of concentrate and Longwool Crossbred had the greatest potential of energy utilization and fattening in high plane of nutrition.