一、杂交育种的回顾和现状: 杂优猪是杂交品系间杂交而产生的商品肥育猪。它与品种间杂交产生的杂种猪不同。养猪业生产中,采用品种间杂交生产杂种猪,利用杂种优势,是提高养猪生产效益的有效措施。随着育种科学技术的进展,逐步认识到,多数品种在其培育过程中都是着眼于综合性状的选择,具体到每一个性状,就难以获得最佳效果。品种又是一个庞大的群体,个体间往往存在着较大的差异,用于杂交,其子代的生产力常不稳定,优势率受到遗传力支配,多 First, the review and status quo of hybrid breeding: Hybrid pigs are cross between hybrids resulting from commercial finishing pigs. It is different from the hybrid pigs produced by crossbreeds. Pig production, the use of hybrids crossbred hybrid pigs, the use of heterosis is an effective measure to improve pig production efficiency. With the progress of breeding science and technology, we have gradually realized that most varieties are focused on the selection of comprehensive traits in their cultivation process, and it is difficult to obtain the best results for each trait. Variety is a large group, there are often large differences between individuals, for hybrids, the productivity of their offspring is often unstable, dominant rate subject to heritability, and more