本文旨在研究敌草快和硫辛酸(LA)对育肥猪肠道结构及消化功能的影响,以探究LA对敌草快引起的应激是否有缓解作用。选取24头(70.64±3.61)kg的健康大白阉公猪,按照2×2因子设计,随机分为对照组、LA组、敌草快组和LA+敌草快组,每个组设6个重复,每个重复1头猪。试验期29 d。LA添加剂量为800 mg/kg饲粮,饲喂贯穿试验全程,而一次性腹腔滴注敌草快于试验第15天进行,无腹腔滴注敌草快试验猪滴注等量的生理盐水。于试验第29天对所有试验猪前腔静脉采血后屠宰取样,运用试剂盒检测血浆和肠道氧化损伤标志物的含量以及空肠食糜消化酶的活性,苏木精-伊红(HE)染色后运用图像分析软件观察肠道形态结构并测定绒毛高度、隐窝深度,并计算绒毛高度/隐窝深度(V/C),荧光定量PCR法检测闭合蛋白(occludin)和紧密结合蛋白(ZO-1)的相对表达量。结果表明:1)敌草快极显著升高了试验猪血浆和肠道丙二醛(MDA)、蛋白质羰基(PCO)和8-羟基鸟苷(8-OHd G)的含量(P<0.01),极显著降低了十二指肠、空肠及回肠绒毛高度、隐窝深度(P<0.01),极显著增大了十二指肠和空肠V/C(P<0.01),显著增大了回肠V/C(P<0.05),极显著降低了空肠occludin和ZO-1 m RNA相对表达量(P<0.01),极显著降低了空肠食糜中淀粉酶、胰蛋白酶以及脂肪酶的活性(P<0.01)。2)饲粮中添加LA对试验猪血浆和肠道MDA、PCO和8-OHd G含量的影响均不显著(P>0.05),对十二指肠、空肠和回肠的绒毛高度、隐窝深度以及V/C的影响均不显著(P>0.05),对空肠occludin和ZO-1 m RNA相对表达量的影响也不显著(P>0.05),对空肠食糜中淀粉酶、胰蛋白酶以及脂肪酶活性的影响差异也均不显著(P>0.05)。3)在应激状态下,饲粮中添加LA使猪血浆8-OHd G含量显著降低(P<0.05),十二指肠绒毛高度、空肠绒毛高度以及回肠隐窝深度显著升高(P<0.05),空肠V/C显著降低(P<0.05),回肠V/C极显著降低(P<0.01),空
Cellular retinoic acid-binding protein 1 （CRABP1） is a well-conserved member of cytosolic lipid-binding protein family. It is an important modulator of retinoic acid signaling. Long serial analysis of gene expression （LongSAGE） analysis suggested that CRABP1 gene was differentially expressed during prenatal skeletal muscle development in porcine. Here, we obtained the full-length coding region sequence and genomic sequence of the porcine CRABP1 gene and analyzed its genomic structures. Subsequently, we examined CRABP1 chromosome assignment using INRA-University of Minnesota 7 000 porcine radiation hybrid panel （IMpRH） and explored its tissue distribution in adult Tongcheng pigs and dynamical expression profiles in prenatal skeletal muscle （33, 65 and 90 days post coitus, dpc） from Landrace （lean-type） （described as L33, L65 and L90） and Tongcheng pigs （obese-type） （described as T33, T65 and T90）. The CRABPI gene was mapped to chromosome 7ql 1-q23 and closely linked to the microsatellite marker SWR1928. Quantitative real-time PCR showed that CRABP1 mRNA was highly expressed in lung and stomach, moderately expressed in placenta and uterus, and weakly expressed in other tissues. Moreover, CRABP1 gene was down-regulated during prenatal skeletal muscle development in both Landrace and Tongcheng pigs and it was expressed much higher in T33 than L33. Two single-nucleotide polymorphisms （SNPs） were detected by sequencing and mass spectrometry methods, allele frequency analysis indicated that g. 281 （G〉A） and g. 2992 （G〉A）were deviated from Hardy-Weinberg equilibrium in the Landrace and DLY （Duroc×（Landrace×Yorkshire）） pig breeds.
ZHAO Shuan-pingTANG Zhong-linZHOU RongQU Chang-qingZHENG Jian-weiLI Kui
