Young L D
U.S. Department of Agriculture, ARS, Clay Center, NE 68933.
J Anim Sci. 1992 Jul;70(7):2030-7. doi: 10.2527/1992.7072030x.
Duroc, Meishan, Fengjing, and Minzhu boars were mated to crossbred gilts during two breeding seasons. From each sire breed group each season, six pens of approximately eight barrows each were slaughtered. A pen of pigs from each sire breed group was slaughtered at 7-d intervals from 168 to 203 d of age each season. Breed of sire effects were significant for all age-adjusted carcass traits except carcass length, fat thickness at the last rib, color score, and firmness score. At 184 d of age, Duroc crosses had the heaviest (P less than .05) slaughter and carcass weights; Minzhu crosses were lighter (P less than .05) than Meishan crosses but not lighter than Fengjing crosses. Differences among age-constant traits reflect differences in BW. After adjustment to a constant carcass weight of 78 kg, the three Chinese breeds had very similar carcass characteristics. Carcasses sired by Durocs had significantly less backfat and larger longissimus muscle area than carcasses sired by the Chinese breeds. Weight of each trimmed wholesale lean cut and their total weight were significantly higher for Duroc crosses than for Chinese crosses. Breed of sire means did not differ significantly for belly weight, but Duroc crosses had less (P less than .05) weight of leaf fat. Relative to Chinese crosses, longissimus muscles from Duroc crosses had more marbling (P less than .05). Sire breed groups did not differ significantly for color or firmness score. Pigs sired by Meishan, Fengjing, and Minzhu produced carcasses with significantly less lean content at a carcass weight of 78 kg than did pigs sired by Duroc.
在两个繁殖季节，将杜洛克、梅山、枫泾和民猪公猪与杂种母猪进行配种。每个季节，从每个父本品种组中挑选约8头公猪，分成6栏进行屠宰。每个季节，从168日龄至203日龄，每隔7天屠宰一栏来自每个父本品种组的猪。除胴体长度、最后肋骨处的脂肪厚度、颜色评分和紧实度评分外，父本品种对所有年龄校正后的胴体性状均有显著影响。在184日龄时，杜洛克杂交猪的屠宰体重和胴体重最重（P<0.05）；民猪杂交猪比梅山杂交猪轻（P<0.05），但不比枫泾杂交猪轻。年龄恒定性状的差异反映了体重的差异。在调整到恒定胴体重78千克后，三个中国品种的胴体特征非常相似。杜洛克猪所产胴体的背膘显著少于中国品种猪所产胴体，且最长肌面积更大。杜洛克杂交猪的每块修整后的批发瘦肉切块重量及其总重量均显著高于中国杂交猪。父本品种的腹脂重量均值差异不显著，但杜洛克杂交猪的板油重量较轻（P<0.05）。相对于中国杂交猪，杜洛克杂交猪的最长肌大理石花纹更多（P<0.05）。父本品种组的颜色或紧实度评分差异不显著。在胴体重78千克时，梅山、枫泾和民猪所产胴体的瘦肉含量显著低于杜洛克猪所产胴体。
