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91.
Bactericidal/permeability-increasing protein (BPI) has a strong effect on sterilization (mainly for G- bacteria),neutralizing the activity of lipopolysaccharide (LPS) and enhancing the phagocytosis of mononuclear cells and neutrophils to pathogenic bacteria.The biological functions of BPI have been researched widely in recent years,which is known as "super antibiotic" and has been explored by many scholars as a candidate gene for resistance.This author summarized the research progress and application prospect of the BPI gene in the pig resistant breeding by introducing the structure,biological function of BPI gene and its relationship with the resistance,which was aimed to provide theoretical references and basis for the function research of pig BPI gene and its practical application in resistance breeding in future. 相似文献
92.
《The Journal of Applied Poultry Research》2016,25(4):539-546
Increasing emergence of salmonellosis presents a threat to the effective control of foodborne disease in humans. The purpose of this study was to evaluate the prevalence of drug susceptibility and molecular characteristics of non-typhoidal Salmonella (NTS) isolated from laying hens (LH) in 3 Moroccan regions, Rabat-Salé-Zemmour-Zaër (RSZZ), Souss-Massa-Drâa (SMD), and the grand Casablanca (GC). A total of 351 samples were collected from 30 consumer egg laying houses at the end of the egg laying period from April to July 2011. Sixty-four out of these 351 examined samples were contaminated by Salmonella. The Salmonella isolated strains were then serotyped and tested for drug susceptibility and analyzed by polymerase chain reaction (PCR) for the presence of the invasion-associated genes invA and spvC and nalidixic acid resistance-associated qnr gene. The prevalence of NTS infection in LH was estimated to be 73.3%. Seven Salmonella enterica serovars were identified: Enteritidis (37.5%), Kentucky (31.2%), Infantis (10.9%), Typhimurium (6.2%), Thompson (6.2%), Agona (4.6%), and Amsterdam (3.1%). Drug susceptibility testing showed that 65.6% of Salmonella were resistant to at least one antibiotic and 25% were resistant to ciprofloxacin. All isolates were positive for the invasion gene invA and 28% of them were positive for the virulence gene spvC. All nalidixic acid-resistant S. Enteritidis isolates were negative for qnr plasmid genes. Our findings clearly suggest the necessity to establish an NTS monitoring and control program for LH in Morocco. 相似文献
93.
M. Pettersson S. Eriksson 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2016,66(4):183-189
There is substantial international influence on the Swedish Warmblood (SWB) sport horse population. The SWB Association suspects that imported horses are pre-selected based on their anticipated performance level, which could lead to biased estimated breeding values (EBVs) for stallions. This study examined different strategies to handle records for imported horses in the genetic evaluation. The stallions were evaluated for 10 traits using 3 different EBV estimation methods that were compared based on ranking comparisons of stallions, accuracy, correlations and absolute differences between EBVs. The results showed that the stallions’ EBVs were affected by imported offspring which, as a group, had higher average scores than horses born in Sweden. Sire EBVs differed by up to 0.6 genetic standard deviation of the trait between methods for stallions with >50% imported offspring. Excluding imported offspring lowered the accuracies and caused larger re-ranking compared with including a fixed effect of origin in the model. 相似文献
94.
M. Ćurković J. Ramljak S. Ivanković B. Mioč A. Ivanković V. Pavić M. Brka C. Veit‐Kensch I. Medugorac 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2016,133(1):71-80
The phylogenetic layout of the genotyped (30 microsatellite) 18 sheep breeds in this study demands and provides the opportunity to evaluate both neutral and adaptive components of genetic diversity in a naturally and artificially selected and subdivided sheep population. Seven Pramenka strains from Bosnia and Herzegovina and Croatia characterized by a very low intensity of artificial selection, preserved the highest neutral genetic variability. Eight central and north‐western European breeds under considerable artificial isolation and selection preserved the lowest genetic variability. Only combinations of various phylogenetic parameters offer a reasonable explanation for underlying evolutionary forces working in the investigated island and mainland sheep breeds under variable natural and artificial selection. More than 60% of total genetic, diversity was allocated to virtually unselected Pramenka strains, and an additional 25% to native moderately selected Graue Gehoernte Heidschnucke and intensively selected Ostfriesische Milchschafe. Some economically very important breeds and strains did not contribute to a pool with maximal genetic diversity, while they play an important role in the cultural heritage of respective countries. 相似文献
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98.
高产小麦品种模式化选育的初步研究 总被引:4,自引:0,他引:4
本文探讨了高产小麦品种理想模式的概念、特点和品种模式化选育的理论依据及优点。对37个亩产400公斤以上的高产品种的产量与其构成因素、形态性状、生理性状以及这些性状之间的关系进行了多元和简单相关分析。针对山东的生态条件和品种的现状,优化了亩产600-650公斤的品种模式。探讨了各类性状间的有机联系和协调发展产量潜 相似文献
99.
低酚陆地棉育种亲本配合力的研究 总被引:5,自引:1,他引:5
选择8个现代低酚陆地棉育种亲本(包括4个高酚棉和4个低酚棉品种),按4×4不完全双列杂交设计,对16个组合的F×进行了双列分析。结果表明,在所研究的10个性状中,子棉产量、皮棉产量和纤维整齐度主要受非加性基因控制,单铃重、衣分、比强度、2.5%跨长和麦克隆值则主要由加性基因控制,衣指由加性和非加性基因共同控制,而子指受环境的影响较大;在大多数性状上,高酚棉亲本的加性遗传方差比低酚棉亲本贡献大,而在2.5%跨长和麦克隆值2个性状上,低酚棉亲本的加性遗传方差起着更重要的作用;中7886是综合性状比较理想的亲本材料,冀合225是较好的高产亲本,冀无252和中无151是较好的优质低酚棉亲本。综合一般配合力和特殊配合力分析结果,组合中7886×冀无252可具较好的育种潜力。 相似文献
100.