张兴隆　杨永在　王长水++曹兵海

摘 要：研究育成期日粮营养对育肥皖南牛产肉性能和胴体等级的影响。30 头去势的体质量相近的7 月龄皖南牛，平均随机分成5 组，各组根据体质量的1.9%、1.6%、1.3%、1.0% 和0.7%补充育成期精料饲养到24 月龄进行育肥，各组在饲养程序相同条件下育肥期3个月后屠宰分割。结果表明：育成期的营养水平育肥期皖南的屠宰性能和胴体等级能产生影响，按体质量1%饲喂精料的G1.0组营养水平能显著提高胴体和净肉中高档肉块比例，该组育成期营养水平使5～7肋骨横切面有丰富的脂肪分布，达到优级胴体等级。

关键词：育成期营养；皖南牛；产肉性能；胴体等级

Effect of Growth-Period Nutrition on Slaughter Performance and Beef Carcass Grade of Fattening Wannan Cattle

ZHANG Xinglong， YANG Yongzai， WANG Changshui， CAO Binghai*

（State Key Laboratory of Animal Nutrition， College of Animal Science and Technology， China Agricultural University，

Beijing 100193， China）

Abstract： The objective of this study was to find the most practical nutrition program for producing high-quality beef by analyzing the effect of growth-period nutrition on the slaughter performance and beef carcass grade. Thirty castrated 7-month-old Wannan cattle of similar body weights were randomly and equally divided into five groups： G1.9， G1.6， G1.3， G1.0 and G0.7 that were respectively provided with a feed concentrate at 1.9%， 1.6%， 1.3%， 1.0% and 0.7% of their body weight for twenty-four months， the fattening-period was three months and the feeding program was same. The results showed that the growth-period nutritional level and feeding program of group G1.0 was most conducive to fat deposition and distribution in the ribeye， increasing the proportions of high quality beef in beef carcasses and pure meat and making the beef carcasses reaching the choice beef grade.

Key words： growth-period nutrition； Wannan cattle； slaughter performance； beef carcass grade

中图分类号：TS251.1 文献标志码：A 文章编号：1001-8123（2015）01-0014-04

doi： 10.7506/rlyj1001-8123-201501004

产肉性能是评价肉牛品种品质的重要指标，通过研究不同品种肉牛屠宰性能，可以为预测不同品种肉牛的经济价值提供理论依据[1]。屠宰率和净肉率等常规屠宰指标也是衡量肉牛产肉量和生长发育情况的主要依据[2]。牛肉级别主要根据部位肉的质量特点进行评定，每头牛待评的部位肉数量相对固定，组成部位肉的多个肌肉群之间质量也存在差异，现在很多企业通过精细分割增加肉块品目，提高高档肉块比例，但目前国内外关于我国南方小型牛屠宰性能、胴体等级和部位肉的增值分割的研究报道很少。因此，研究育成期营养对育肥皖南牛屠宰性能和胴体等级的影响具有很大的意义，也具有很大的经济价值和实用价值。本实验目的……