MUC13 is a major gene that controls the susceptibility or resistance to diarrhea caused by ETEC F4 ac in *** this study,the MUC13 resistant allele and performance traits of 3 successive generations of a nucleus Duroc ...
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MUC13 is a major gene that controls the susceptibility or resistance to diarrhea caused by ETEC F4 ac in *** this study,the MUC13 resistant allele and performance traits of 3 successive generations of a nucleus Duroc breeding population,a total of 250 pigs,were determined using molecular and conventional breeding techniques to screen out the Duroc population homozygous for MUC13 resistant *** the same feeding and management conditions,the occurrence of diarrhea in same-litter pre-weaned piglets from the 20 litters of breeding sows and 20 litters of propagating sows were 8.7% and 18.4%,respectively(P〈 0.01).However,there was no significant difference in survival rate of same-litter weaned piglets from breeding sows and propagating sows(P 〈0.05).The determination results showed there was no significant difference in days of age required by 1stgeneration and 3rd generation to grow to 100 kg of body ***,compared to that of the 1st generation,the live backfat thickness of the 3rdgeneration was reduced by 1.46 mm(P 〉0.05).However,no significant differences in growth rate and live backfat thickness were found among the MUC13 genotypes from all the 3generations(P 0.05).In conclusion,the homozygosis for the MUC13 resistant allele not only can control the occurrence of diarrhea in piglet but also can reduce significantly live backfat ***,the homozygosis for the MUC13 resistant allele has no significant effects on growth and development of piglets.
肌肉生长抑制素(myostatin,简称抑肌素,又称 GDF8)是骨骼肌发育的负调节因子.本研究对猪抑肌素基因5′调控区的序列进行了克隆,对该区段的多态性及其与大白猪初生重和早期生长的关系进行了分析。结果表明,猪抑肌素基因5′调控区的序列存在长度多态性和单核苷酸多态性 (SNP),其中,在435和447位点,由 PCR-SSCP 判定的2个等位基因(A 和 B)核苷酸序列不同:A 等位基因分别为 A 和 G,B 等位基因则分别为 G 和 A。在所检测的大白猪群体中 A 和 B 等位基因的频率分别为0.525和0.475;所检测的9头莱芜猪中4头为从型,5头为 AB 型,未检测到 BB 型.本研究首次发现等位基因 B 对大白猪21日龄(P<0.01)、28日龄(P<0.05)和70日龄体重(P<0.05) 以及0-21日龄(P<0.01)、0-28日龄(P<0.05)和21-70日龄(P<0.01)的日增重等早期生长性状均具有有利效应,加性效应值分别为0.596±0.205kg(P=0.0041)、0.498±0.200kg(P=0.0136) 和1.409±0.551kg(P=0.0112)以及28.39±9.74g(P=0.0041)、17.78±7.15g(P=0.0136)和37.00 ±16.92g(P=0.0304),均达到显著或极显著水平.而对28-70日龄的日增重,尽管 BB 基因型个体有较高的日增重,但差异不显著(P>0.1)。
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