烟草黑胫病菌(Phytophthora parasitica var. nicotianae)生理小种鉴定技术研究   总被引：1，自引：0，他引：1  

谢成颂  王智发  刘延荣  张广民 《山东农业大学学报(自然科学版)》1989,(1)

在1980-1986年,对烟草黑胫病菌生理小种鉴定技术和方法进行了研究和探讨。结果表明,Nicotiana ncsophil(?),Burley21;Burley37;N.stocktonii是理想的鉴别寄主:整株接种方法优于其他的接种方法;接种物浓度以控制在相同的水平(10~3 ml)为宜。为减小生物测定的差异,所有菌系应一次完成测定。  相似文献   

Inclusion levels and modes of whole grain incorporation into wheat-based rations differentially influence the performance of broiler chickens     

A. F. Moss  H. H. Truong  S. Y. Liu 《British poultry science》2018,59(1):110-120

1. The objective was to compare three whole grain (WG) inclusion levels (7.5, 15 and 30%) offered to broiler chickens by three modes of WG incorporation: (i) pre-pellet WG inclusion, (ii) post-pellet WG inclusion as a blend of WG and pelleted concentrate and (iii) post-pellet WG inclusion where WG and pelleted concentrate were provided in separate feed trays against a ground-grain, wheat-based control diet.

2. Ten dietary treatments were offered to 6 replicate cages (6 birds per cage) of male Ross 308 chickens from 7 to 28 d post-hatch. The effects of treatment on relative gizzard weights, gizzard contents, pancreatic weights and pH of gizzard digesta were monitored. Parameters of growth performance, nutrient utilisation (apparent metabolisable energy [AME], metabolisable to gross energy [ME:GE] ratios, nitrogen [N] retention and N-corrected AME [AMEn]), apparent starch and protein (N) digestibility coefficients and disappearance rates in for small intestinal segments and concentrations of free amino acids in plasma taken from the anterior mesenteric vein were determined.

3. Whole grain feeding (WGF) did not influence weight gain, but 30% post-pellet blended and 15 and 30% post-pellet separated treatments significantly depressed (P < 0.05) feed intakes while the 30% post-pellet separated treatment improved (P < 0.01) feed conversion ratios (FCR). WGF regimes significantly increased relative gizzard weights.

4. Overall, WGF generated profound responses in AME, ME:GE ratios, N retention and AMEn that were highly correlated with relative gizzard weights. In general, WGF improved starch and protein (N) digestibilities and again there were some correlations with these outcomes and relative gizzard weights.

5. Post-pellet WG inclusions where WG and pelleted concentrate were offered separately provided chickens with the opportunity to choice feed. Birds showed a preference for the relatively high-protein pelleted concentrate and at 30% WG, this resulted in an improvement in FCR of 7.69% (1.260 versus 1.365; P < 0.001) relative to the ground-grain control diet.  相似文献   

Development New Molecular Markers for Quantitative Trait Locus (QTL) Analysis of the Seed Protein Content Based on Whole Genome Re-Sequencing in Soybean     

WANG Jia  ZENG ZhaoQiong  LIANG JianQiu  YU XiaoBo  WU HaiYing  ZHANG MingRong 《中国农业科学》2019,52(16):2743-2757

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“四全”育人夯实立德树人德育基础——以苏州工业职业技术学院为例     

邓霞 《湖南农机》2014,(9)

随着社会发展的推动和各种思想文化的交流、交融与交锋,给高职院校的思想政治教育工作带来前所未有的挑战。苏州工业职业技术学院积极探索实践"全员、全程、全方位、全心全意"育人的德育体系,在立德树人背景下,以踏实、务实、求实的作风不断夯实德育基础,努力开创"责任到人,纵向到底,横向到边"的德育工作局面。  相似文献   

以全产业链思维优化甘肃省“粮改饲”生产力布局     

笪晓军  王兴琪  刘永康  马璐  王凤萍 《中国饲料》2021,1(6):143-146

用全产业链思维优化“粮改饲”生产力布局具有重要的现实意义和理论价值。本文以甘肃省为例,总结甘肃省“粮改饲”工作已取得的工作成效和不足,论述了“粮改饲”构建全产业链的必要性,初步探讨了甘肃省“粮改饲”全产业链模式和布局优化,并提出完善相关支持政策、培育壮大龙头企业、高度重视品牌建设和创新科技带动引领4条对策建议。 [关键词]全产业链|粮改饲|生产力布局|甘肃省  相似文献   

Accuracy of genomic prediction using imputed whole‐genome sequence data in white layers          下载免费PDF全文

M. Heidaritabar  M.P.L. Calus  H‐J. Megens  A. Vereijken  M.A.M. Groenen  J.W.M. Bastiaansen 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2016,133(3):167-179

There is an increasing interest in using whole‐genome sequence data in genomic selection breeding programmes. Prediction of breeding values is expected to be more accurate when whole‐genome sequence is used, because the causal mutations are assumed to be in the data. We performed genomic prediction for the number of eggs in white layers using imputed whole‐genome resequence data including ~4.6 million SNPs. The prediction accuracies based on sequence data were compared with the accuracies from the 60 K SNP panel. Predictions were based on genomic best linear unbiased prediction (GBLUP) as well as a Bayesian variable selection model (BayesC). Moreover, the prediction accuracy from using different types of variants (synonymous, non‐synonymous and non‐coding SNPs) was evaluated. Genomic prediction using the 60 K SNP panel resulted in a prediction accuracy of 0.74 when GBLUP was applied. With sequence data, there was a small increase (~1%) in prediction accuracy over the 60 K genotypes. With both 60 K SNP panel and sequence data, GBLUP slightly outperformed BayesC in predicting the breeding values. Selection of SNPs more likely to affect the phenotype (i.e. non‐synonymous SNPs) did not improve the accuracy of genomic prediction. The fact that sequence data were based on imputation from a small number of sequenced animals may have limited the potential to improve the prediction accuracy. A small reference population (n = 1004) and possible exclusion of many causal SNPs during quality control can be other possible reasons for limited benefit of sequence data. We expect, however, that the limited improvement is because the 60 K SNP panel was already sufficiently dense to accurately determine the relationships between animals in our data.  相似文献   

OPTIMAL DESIGN WITH WHOLE STRUCTURE PARAMETERS OF LOWER PART OF HUGE EXCAVATOR     

Liu Chongde Wang Xiaoming Gu Lan 《保鲜与加工》1992,(6):10-17

A optimal design with whole structure parameters and its program are carried out. A reasonable model is established. Using the method a optimal design with whole structure parameters by original parameters of American P&H2300xp excavator was calculated. The size,carried out by the method,approximates to the size of P&H2300xp excavator very well.  相似文献   

Application of Gestalt Theory in Architecture Esthetics     

《保鲜与加工》2003,(5):12-15

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旱地全膜双垄沟残膜捡拾机的设计   总被引：1，自引：0，他引：1  

王波  韩正晟  王松林  戴飞  高爱民 《农机化研究》2015,(7):109-112

针对我国西北旱地全膜双垄沟残膜捡拾机仿形能力差、拾净率低的问题,设计了一种旱地全膜双垄沟滚筒式残膜捡拾机。同时,阐述了整机结构及工作原理,并通过机构分析和计算确定了关键部件工作参数,旨在为残膜回收提供一种新的机具。  相似文献   

水稻旱作覆膜节水增产试验研究     

吴珠明  时光宇  鲍炳钧 《中国农村水利水电》2001,(2):22-23

通过水稻旱作全程覆膜与半程覆膜、旱作不覆膜及水栽对比试验，研究其耗水规律，计算其节水量与增产量，并进行经济效益分析，提出了适合本地区的栽培模式。  相似文献