The phenotypic and genetic trends of the growth and reproductive traits in new Yorkshire dam line with high prolificacy were analyzed by multiple traits derivative free restricted maximum likelihood (MTDFREML) with mix model. The results showed that the phenotypic trends of total number of born (TNB), alive number of born (ANB), and age at 100 kg wight (AGE100) were 0.170, 0.100 and -2.072, while their genetic trends were 0.057 7, 0.030 4 and -0.658 0, respectively. It indicated that the selection on the two main traits (TNB and AGE100) was successful, the reproductive performance were successively improved and had no adverse effects on the growth performance.%配合混合模型,用多性状非求导约束最大似然法(Multiple traits derivative free restricted maximum likelihood,MTDFREML)分析估计了大白猪高繁母本新品系生长和繁殖性状的表型与遗传趋势.结果表明,窝产仔数、窝产活仔数和达100 kg体重日龄性状的表型趋势分别为0.170、0.100和-2.072,遗传趋势分别为0.057 7、0.030 4和-0.658 0.说明大白猪品系选择试验的窝产仔数和达100 kg体重日龄2个主选性状的选择是明显有效的,繁殖性能在逐代提高,而且并未对肥育性能造成不利的影响.
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