The number of ribs and vertebrae in a Pietrain cross: variation, heritability and effects on performance traits
The number of ribs and vertebrae in a Pietrain cross: variation, heritability and effects on performance traits
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DOI：
10.1111/j.1439-0388.2004.00482.x
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发表时间：
2004-12-01
影响因子：
2.6
通讯作者：
Kalm, E
中科院分区：
文献类型：
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作者：
Borchers, N;Reinsch, N;Kalm, E
在一项三代实验中，以5头纯种皮特兰公猪和1头长白猪、1头大白色母猪和12头长白猪×大白色母猪杂交母猪作为创始动物，测定肋骨和骶前椎骨的数量。记录了111只F-1动物和2711只F-2动物的这些数量。肋骨的数量从13到17不等，骶前椎骨的数量从26到30不等。计算出肋骨数量的平均值为15.5，椎骨数量的平均值为28.6，两者的标准差均为0.6。贝叶斯遗传力估计为0.51肋骨数和0.62椎骨数。表型相关系数为0.76，遗传相关系数为0.97，表明这两个性状的亲缘关系较近。在其他分析中，肋骨和椎骨数量对不同生长和胴体性状可能的直接或相关影响进行了研究。结果表明，与生长、肥满度、肌肉发达度和肉质有关的几个性状均受到显著影响。骶前椎骨数目或连锁数量性状位点（QTL）的基因占胴体长度的表型变异的11.5%，占火腿重量的表型变异的2.4%。
In a three-generation experiment with five purebred Pietrain boars and one Landrace, one Large White and 12 Landrace x Large White crossbred sows as founder animals the number of ribs and presacral vertebrae was determined. These numbers were recorded for 111 F-1-animals and for 2711 F-2-animals. The number of ribs varied from 13 to 17 and the number of presacral vertebrae ranged from 26 to 30. Means of 15.5 for the number of ribs and 28.6 for the number of vertebrae with a standard deviation of 0.6 for both were calculated. Bayesian heritability estimates were 0.51 for the rib number and 0.62 for the vertebrae number. A phenotypic correlation of 0.76 and a genetic correlation of 0.97 indicated a close relationship of both traits. In additional analyses possible direct or linked effects of rib and vertebrae number on different growth and carcass traits were investigated. Significant effects were found for several traits related to growth, fatness, muscularity and meat quality. Genes for the presacral vertebrae number or linked quantitative trait loci (QTL) accounted for 11.5% of the phenotypic variation in carcass length and for 2.4% of the phenotypic variation in ham weight.