Ear type and coat color on growth performances of crossbred pigs
Ear type and coat color on growth performances of crossbred pigs
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DOI：
10.5713/ajas.2002.1178
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发表时间：
2002-08-01
期刊：
影响因子：
--
通讯作者：
Chung, HW
中科院分区：
文献类型：
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作者：
Choy, YH;Jeon, GJ;Chung, HW
从共202个杂交猪的记录进行了分类，他们的耳朵类型和毛色，以检查存在的相互关系与生长性能。杂交猪是由5头韩国家公猪与10头长白猪交配产生的全同胞家系的F2代。202头猪中，耳型以重度下垂型为主，有195头，其次为直耳型和轻度下垂型。毛色可分为全白色、全黑、显性白色和显性黑4种类型，毛色类型间的比例不符合孟德尔两位点独立性原则，毛色类型与毛色之间存在依赖关系。然而，由于除了严重下垂的耳朵类型之外的耳朵类型的罕见性，依赖性来自于那些罕见的汽车类型的分布。分析了穗型和毛色对生长性能影响的三个最小二乘模型。第一个模型分析了对出生体重、3周龄和6周龄体重以及断奶前和3周龄和5周龄之间的ADG的影响。这个模型除了包括耳朵类型和毛色外，还包括性别。第二个模型在性能测试开始时分析断奶后生长性状（初始重量、最终重量和这些时期之间的ADG）。该模型还包括性别、试验组和开始年龄（作为协变量）的影响。第三个模型拟合屠宰前禁食体重，包括性别、试验组和屠宰时年龄的影响（作为协变量）。性别和车型效应对各性状的变异源均不显著。试验组是所有断奶后性状的显著变异源。在性能测试开始之前，被毛颜色的影响不显著，然后变得显著。在195日龄左右的终重、从性能试验开始的平均日增重和终重测量中，以黑色为主的猪的最小二乘均值显著低于其他三种毛色猪。
Records from a total of 202 crossbred pigs were classified by their ear type and coat color to examine the presence of interrelationships with growth performances. Crossbred pigs were F2 generations of full sib family out of ten Landrace sows bred by 5 Korean domestic boars. Heavily drooped ear type was predominant, 195 out of 202 pigs over the other two types (1 straight and 6 slightly drooped). Coat colors were classified as four categories, all white, all black, dominant white or dominant black, Ratio among coat color categories did not fall within Mendelian principle of independence regarding two loci involved, There was dependency between car type and coat color. However, due to rarity of ear types other than heavy drooped, dependency comes from distribution of those rare car types. Three least squares models to test the effect of ear type and coat colors on growth performances were analyzed. First model analyzed effects on birth weight, body weight at 3 and 6 weeks and ADG's before weaning and between 3 and 5 weeks of age. This model included sex in addition to ear type and coat color. Second model analyzed postweaning growth traits (initial weight, Final weight and ADG between these periods) upon initiation of performance testing. This model included effects of sex, test group and start age (as a covariate) in addition. Third model was fit for fasted weight before slaughter and included the effects of sex, test group and age at slaughter (as a covariate). The effects of sex and car type were not significant source of variation for all traits. Test group was a significant source of variation for all the postweaning traits. Effect of coat color was not significant until the initiation of performance testing and became significant then after. Least squares means of dominantly black pigs were significantly lower than the other three coat colored pigs in final weight around 195 days of age and in ADG from the start of performance test and Final weight measure.