Demographics,farm and reproductive management strategies used in Australian automatic milking systems compared with regionally proximal conventional milking systems          下载免费PDF全文

DM Keeper  KL Kerrisk  JK House  SC Garcia  P Thomson 《Australian veterinary journal》2017,95(9):325-332

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Effect of insemination site and diameter of the pre‐ovulatory follicle on the odds of pregnancy in heifers using sexed or non‐sexed semen          下载免费PDF全文

L Ingenhoff  E Hall  S Ranjbar NI  JK House 《Australian veterinary journal》2017,95(9):317-324

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Haemolytic anaemia in cattle in NSW associated with Theileria infections     

MM Izzo  I Poe  N Horadagoda  AJ De Vos  JK House 《Australian veterinary journal》2010,88(1-2):45-51

Several outbreaks of anaemia, jaundice, abortion and mortality in cattle in New South Wales were attributed to the intracellular parasite, Theileria buffeli . Disease occurred predominantly in periparturient animals that had been moved from inland to coastal areas. Diagnosis was made via exclusion of other causes of haemolytic anaemia and observation of the parasite in blood smears. Treatments included both registered and non-registered products. There is a possibility of a new strain of Theileria sp. in Australia and the possible vectors encountered in NSW are discussed.  相似文献   

Grassland vegetation changes and nocturnal global warming   总被引：4，自引：0，他引：4  

RD Alward  JK Detling  DG Milchunas 《Science (New York, N.Y.)》1999,283(5399):229-231

Global minimum temperatures (TMIN) are increasing faster than maximum temperatures, but the ecological consequences of this are largely unexplored. Long-term data sets from the shortgrass steppe were used to identify correlations between TMIN and several vegetation variables. This ecosystem is potentially sensitive to increases in TMIN. Most notably, increased spring TMIN was correlated with decreased net primary production by the dominant C4 grass (Bouteloua gracilis) and with increased abundance and production by exotic and native C3 forbs. Reductions in B. gracilis may make this system more vulnerable to invasion by exotic species and less tolerant of drought and grazing.  相似文献   

Rotation of a single molecule within a supramolecular bearing     

JK Gimzewski  C Joachim  RR Schlittler  V Langlais  H Tang  I Johannsen 《Science (New York, N.Y.)》1998,281(5376):531-533

Experimental visualization and verification of a single-molecule rotor operating within a supramolecular bearing is reported. Using a scanning tunneling microscope, single molecules were observed to exist in one of two spatially defined states laterally separated by 0.26 nanometers. One was identified as a rotating state and the other as an immobilized state. Calculations of the energy barrier for rotation of these two states show that it is below the thermal energy at room temperature for the rotating state and above it for the immobilized state.  相似文献   

Design of a surface alloy catalyst for steam reforming   总被引：1，自引：0，他引：1  

F Besenbacher  I Chorkendorff  BS Clausen  B Hammer  AM Molenbroek  JK Norskov  I Stensgaard 《Science (New York, N.Y.)》1998,279(5358):1913-1915

Detailed studies of elementary chemical processes on well-characterized single crystal surfaces have contributed substantially to the understanding of heterogeneous catalysis. Insight into the structure of surface alloys combined with an understanding of the relation between the surface composition and reactivity is shown to lead directly to new ideas for catalyst design. The feasibility of such an approach is illustrated by the synthesis, characterization, and tests of a high-surface area gold-nickel catalyst for steam reforming.  相似文献   

Plant availability of phosphorus in dead herbage ingested by surface-casting earthworms     

G.P. Mansell  J.K. Syers  P.E.H. Gregg 《Soil biology & biochemistry》1981,13(2):163-167

A combined field and glasshouse technique was developed to evaluate the plant-availability of phosphorus from two sources. The first source was ryegrass which had been ingested by earthworms and excreted in surface casts, and the second was untreated ryegrass. Surface casts labelled with ³²P were obtained in the field from earthworms fed with ³²P-labelled ryegrass. In a glasshouse study, labelled casts or labelled herbage were placed on the surface of soil in which ryegrass was growing. Ryegrass recovered proportionately more ³²P from cast material than from dead herbage. The results suggest that earthworms increase the short-term plant availability of P derived from plant litter by two to three fold. The effect of surface-casting earthworms on the rate of cycling of P in soils of different P status is discussed.  相似文献   

Genotypes of Leptospira isolated from Queensland cattle     

BG CORNEY  CS McCLINTOCK  J. COLLEY  JK ELDER 《Australian veterinary journal》1996,73(2):75-76

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Performance Recording of Animals: State of the Art, 1992     

Peter Mansell 《Australian veterinary journal》1994,71(6):189-189

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Ulcerative pododermatitis in a cat associated with Anatrichosoma sp.     

F Ramiro-Iba?ez  J Winston  E O'Donnell  J Mansell 《Journal of veterinary diagnostic investigation》2002,14(1):80-83

A 9-year-old castrated male Chartreaux cat was presented for an ulcerative pododermatitis of all 4 paws. A clinical exam was inconclusive and supportive therapy did not improve the condition. Histologic examination revealed an ulcerative and eosinophilic dermatitis associated with epidermal and dermal nematodes and ova consistent with the aphasmid Anatrichosoma sp. Treatment with ivermectin completely resolved the skin lesions. Anatrichosomiasis should be included in the differential diagnosis of ulcerative pododermatitis in cats, at least in the southwestern United States.  相似文献