The objective of this study was to evaluate the effect of sire line on wean-to-finish performance, carcass characteristics, and meat pricing variables. Pigs used for this study were the progeny of a commercial Landrace x Large White female mated to one of the following sire lines: a purebred Duroc line (Line S1), or a synthetic (Line S2) or purebred Duroc line (Line S3) originating from a different genetic source. An equivalent number of pigs (n =144) were used per group, for 432 pigs placed on test. Average initial weights per line were 6.67 ± 0.24, 6.67 ± 0.24, and 6.60 ± 0.24 for lines S1, S2, and S3, respectively. At placement, 8 pigs were assigned to each pen (split sex) and blocked by line and initial BW, with 18 replicates per line. Data were analyzed at the pen level using the PROC MIXED procedure of SAS, where the effects of line, sex, and line*sex were fitted as fixed effects and replicate was fitted as a random effect. Overall, piglets from line S2 (0.403 vs 0.381; P ≤ 0.0004) and line S3 (0.402 vs 0.381; P ≤ 0.001) had improved GF compared with piglets from line S1. The ADFI was greater in piglets from line S1 relative to piglets from line S2 (2.264 vs 2.117 kg; P ≤ 0.0001) and line S3 (2.264 vs 2.159 kg; P ≤ 0.004). The ADG, HCW, dressing yield, and loin depth were not different among treatment (P > 1.00). Piglets from line S3 had greater percent lean (57.12 vs 56.29 %; P ≤ 0.0001) and better carcass grade premium ($7.07 vs 6.60; P ≤ 0.0291) relative to piglets from line S1. In conclusion, line S1 piglets had greatest ADFI, but line S2 pigs and line S3 piglets had better feed efficiency. Line S3 pigs were leaner and had better carcass grade premium.

中文翻译：

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PSIII-10 父系对商业杂交猪生长完成性能、胴体特征和肉类定价变量的影响

本研究的目的是评估公牛系对断奶至育成性能、胴体特征和肉类定价变量的影响。用于本研究的猪是商业长白 x 大白雌性的后代，与以下公牛系之一交配：纯种杜洛克系（S1 系），或合成（S2 系）或纯种杜洛克系（S3 系）起源来自不同的遗传来源。每组使用相同数量的猪 (n = 144)，432 头猪进行测试。S1、S2 和 S3 行的每行平均初始权重分别为 6.67 ± 0.24、6.67 ± 0.24 和 6.60 ± 0.24。在安置时，将 8 头猪分配到每个栏（性别分开），并按行和初始 BW 封闭，每行 18 个重复。使用 SAS 的 PROC MIXED 程序在钢笔级别分析数据，其中线、性别、和 line*sex 被拟合为固定效应，复制被拟合为随机效应。总体而言，S2 品系（0.403 对 0.381；P ≤ 0.0004）和 S3 品系（0.402 对 0.381；P ≤ 0.001）的仔猪与 S1 品系的仔猪相比具有改善的 GF。相对于 S2 系（2.264 对 2.117 kg；P ≤ 0.0001）和 S3 系（2.264 对 2.159 kg；P ≤ 0.004）的仔猪，S1 系仔猪的 ADFI 更高。ADG、HCW、修整产量和腰部深度在处理之间没有差异（P > 1.00）。与 S1 系的仔猪相比，S3 系的仔猪瘦肉百分比更高（57.12 对 56.29 %；P ≤ 0.0001）和胴体等级溢价（7.07 美元对 6.60 美元；P ≤ 0.0291）。总之，S1 系仔猪的 ADFI 最高，但 S2 系和 S3 系仔猪的饲料效率更高。S3 系猪更瘦，具有更好的胴体等级溢价。