EFFECT OF SELECTION FOR LEAN GROWTH-RATE UPON FEED-UTILIZATION BY MARKET HOG
EFFECT OF SELECTION FOR LEAN GROWTH-RATE UPON FEED-UTILIZATION BY MARKET HOG
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DOI：
10.4141/cjas78-038
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发表时间：
1978-01-01
影响因子：
1
通讯作者：
FREDEEN, HT
中科院分区：
文献类型：
--
作者：
SATHER, AP;FREDEEN, HT
本文介绍了一个指标选择系和一个遗传控制系两个群体猪的饲养场和胴体性能的个体饲养试验结果。群体于1961年开始，选择系于1972年重组，目前的评价是在1976年出生的后代。该指数是基于2个性状，生长速度和背膘厚。123头猪的饲养场数据表明，饲养场增重率的直接遗传反应为0.94标准偏差单位（SDU），试验天数的相关反应为-1.07 SDU，所需总饲料的相关反应为-1.22 SDU，料重比的相关反应为-1.07 SDU。96头猪的胴体数据表明，平均背膘厚的直接遗传反应为-1.51SDU，carcarr指数的相关遗传反应为1.21SDU。在经济方面（1976年值），胴体品质的改善代表了每头猪收入的增加。增长率的增加相当于每头猪的固定成本和非饲料可变成本降低10%;饲料需求的相关反应降低了每头猪的饲料成本。猪试验计划的实际意义进行了讨论。
Results from an individual feeding trial comparing the feedlot and carcass performance of pigs from 2 populations, an index selected line and a genetic control, were described. The populations were initiated in 1961, the select line restructured in 1972, and the present evaluation made on progeny born in 1976. The index was based on 2 traits, growth rate and backfat. Feedlot data for 123 pigs indicated a direct genetic response of 0.94 standard deviation units (SDU) for rate of feedlot gain and correlated responses of -1.07 SDU for days on test, -1.22 SDU for total feed required and -1.07 SDU for feed/gain ratio. Carcass data for 96 pigs indicated a direct genetic response of -1.51 SDU for average backfat and a correlated response of 1.21 SDU for carcarr index. In economic terms (1976 values) the improvement in carcass merit represented an increased revenue per pig. The increased growth rate was equivalent to a 10% reduction in the fixed costs and non-feed variable costs per pig; the correlated response in feed requirements reduced feed costs per pig. Practical implications with respect to pig testing programs were discussed.