Characteristics of Rice Cultivars with Implications for Crawfish Double Cropping1     

Martin W. Brunson  Richard W. Taylor  Bert J. Hoff 《Journal of the World Aquaculture Society》1988,19(1):8-13

Twenty-five domestic rice (Oryza sativa L.) cultivars were evaluated in a simulated rice/crawfish double cropping system in southwest Louisiana during 1983 and 1984. Wide variation was observed among cultivars in parameters believed to be important for maximizing productivity in such a system. Mean maturity ranged from 99 (Labelle) to 118 days (Starbonnet), while height ranged from 76 (Bellemont) to 130 cm (Della, Nato). Significant differences in grain yield response were observed, with yields ranging from 4,101 (Bluebelle) to 6,665 kg/hectare (Newbonnet). Straw dry matter production varied greatly, from 3,831 (Bellemont) to 9,170 kg/hectare (Della), and was positively correlated with plant height (r = 0.64; P = 0.0001). Ratoon biomass production was negatively correlated with both grain yield (r = -0.39; P = 0.0001) and maturity group (r = -0.69; P = 0.0001). Plant senescence at grain maturity also varied greatly and appears to be a factor in post-harvest ratoon capability. Early or very early maturing cultivars with both proven grain production and good ratooning capability appear best suited. Cultivar selection should be based upon individual farm situations and currently employed agronomic practices.  相似文献   

Legal regulations and practical implementation of inspection of slaughter animals and their meat, concerning fur-bearing game     

F Bert  R M Hadlok 《Tier?rztliche Praxis》1988,16(3):219-226

Meat regulations also involve game inspection. This publication deals with the regulations concerning furred game intended for slaughter and furred game hunted for food.  相似文献   

The Use of an Enzyme-linked Immunosorbent Assay for Diagnosis of Actinobacillus pleuropneumoniae Infection in Pigs   总被引：7，自引：0，他引：7       下载免费PDF全文

Willson PJ  Schipper C  Morgan ED 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(7):583-585

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Determinants of income-earning strategies and adoption of conservation practices in hillside communities in rural Honduras     

Hans G.P. Jansen  Angel Rodriguez  Amy Damon  John Pender  Jacqueline Chenier  Rob Schipper 《Agricultural Systems》2006

Based on the results of participatory diagnostic surveys conducted in 95 rural communities in the hillsides of Honduras, we determine income earning strategies at the community level; identify their main determinants; and analyze the adoption of of conservation practices. Eight income-earning strategies were distinguished that reflect differences in comparative advantage between communities. We explain the choice of income earning strategy using a multinomial logit model that includes biophysical, economic, social and institutional variables. We use a probit model to show that adoption of conservation practices is determined by the type of income earning strategy, population density, market access, and organizational variables.  相似文献   

Revisiting rice breeding methods – evaluating the use of rapid generation advance (RGA) for routine rice breeding     

Bertrand C. Y. Collard  Joseph C. Beredo  Bert Lenaerts  Rhulyx Mendoza  Ronald Santelices  Vitaliano Lopena 《Plant Production Science》2017,20(4):337-352

Rice production needs to increase in the future in order to meet increasing demands. The development of new improved and higher yielding varieties more quickly will be needed to meet this demand. However, most rice breeding programmes in the world have not changed in several decades. In this article, we revisit the evidence in favour of using rapid generation advance (RGA) as a routine breeding method. We describe preliminary activities at the International Rice Research Institute (IRRI) to re-establish RGA on a large scale as the main breeding method for irrigated rice breeding. We also describe experiences from the early adoption at the Bangladesh Rice Research Institute. Evaluation of RGA breeding lines at IRRI for yield, flowering time and plant height indicated transgressive segregation for all traits. Some RGA lines were also higher yielding than the check varieties. The cost advantages of using RGA compared to the pedigree method were also empirically determined by performing an economic analysis. This indicated that RGA is several times more cost effective and advantages will be realized after 1 year even if facilities need to be built. Based on our experience, and previous independent research empirically testing the RGA method in rice, we recommend that this method should be implemented for routine rice breeding in order to improve breeding efficiency.  相似文献   

Low Temperature Studies with Colloidal Silicic Acid     

Hazel F  Parker JA  Schipper E 《Science (New York, N.Y.)》1949,110(2850):161-162

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Rhinopneumonia or mycotoxin intoxication? Neurologic phenomena in horses from a riding school     

Sloet van Oldruitenborgh-Oosterbaan MM  Schipper FC  Goehring LS  Gremmels JF 《Tijdschrift voor diergeneeskunde》1999,124(22):679-681

In the course of several days most of the 40 riding-school horses turned out in paddocks developed ataxia of variable severity. Five of these horses showed severe ataxia and tremors, became paralyzed and were euthanized. Eleven privately-owned horses which were stabled on the same premises showed no clinical signs. The most likely diagnosis seemed to be the 'neurological form of EHV1', although the signs were not entirely typical. A few weeks later a second outbreak occurred among the riding-school horses and one of the privately-owned horses also showed signs of ataxia. In the meantime it had been shown that EHV1 titers in paired serum samples had not increased and that the cerebrospinal fluid of one of the severely affected horses was normal. Toxicological examination of hay, delivered just before the first outbreak and stored for the winter, showed a significantly increased concentration of lolitrem B mycotoxin (5-6 mg/kg). The hay appeared to have been made of ryegrass used for lawns and playing fields. Retrospectively it became probable that this hay occasionally been fed to the horses just before the onset of clinical problems. It is concluded that the horses showed the 'ryegrass-stagger syndrome'.  相似文献   

Evaluation of pseudorabies viral antigens in the agar gel immunodiffusion test.     

N E Pfeiffer  I A Schipper 《American journal of veterinary research》1979,40(4):595-598

Procedures designed to extract pseudorabies viral (PRV) antigens from PRV-infected tissue cultures were investigated to determine whether differences in extraction method had an effect upon the final concentrated antigenic product. All four of the preparations made from PRV-infected tissue culture cells (trypsin extract and disrupted cells) or entire PRV-infected cultures (polysorbate 80 extract and (NH4)2SO4 precipitate) contained relatively large amounts of the same antigen, whereas cell-free PRV-infected tissue culture fluids did not contain significant amounts of this antigen. Specific antibody directed against this antigen was present in all PRV antisera tested. Two other antigens were observed in some of the preparations, but PRV antisera varied in their ability to precipitate with these antigens. Therefore, the number of precipitation lines observed in agar gel immunodiffusion between PRV preparations and PRV-positive antisera depended both upon the extraction method used to obtain the antigen and upon the specificity of the selected antiserum.  相似文献   

Structure-activity relationship study of alkynyl ether insecticide synergists and the development of MB-599 (verbutin)     

Bertók B  Pap L  Arvai G  Bakonyvári I  Kuruczné Ribai Z 《Pest management science》2003,59(4):377-392

Structure-activity relationships of aryl alkynyl synergists of the general formula of Ar-Q-R, where Q represents a bridging structure, were studied using a standardised testing system and Relative Potency values. Ethers, esters, oxime ethers, amides and amines were prepared and evaluated. The length of the R-alkynyl chain, the role of the bridge and the substitution of the aromatic ring were examined systematically. The most potent compounds possessed an aromatic ring connected via a bridge of three atoms to an alkynyl chain, forming together a linear side-chain of six atoms. Several highly potent compounds were synthesised of which one (MB-599; proposed common name verbutin) was selected for development as a selective insecticide synergist in crop protection. Its high potential at practical insecticide:synergist ratios makes possible the reduction of the total amount of insect-control chemicals applied, and its use as an additive to produce new formulations of existing insecticides makes it highly advantageous in resistance management, giving a new tool to sustain the effectiveness of a wide range of insecticides. A product containing a (1+1) mixture of verbutin and beta-cypermethrin was launched in Hungary in 2002.  相似文献   

Short summary of the final report of the survey, "Name Recognition among Veterinarians." Veterinarians take action in cases of large animal abuse     

Veling J  Muller B 《Tijdschrift voor diergeneeskunde》2003,128(20):632-634

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