Maintenance of acquired immunity to Trichostrongylus colubriformis in Merino sheep that are losing weight     

MFJ VAN  HOUTERT  DL WATSON  IA BARGER 《Australian veterinary journal》1995,72(8):301-303

SUMMARY The effect of loss of weight on maintenance of acquired immunity to Trichostrongylus colubriformis in Merino sheep was assessed in 2 experiments. Adult Merino sheep with previously acquired immunity to T colubriformis were housed in individual pens. Sheep were infected 3 times weekly with 2000 T colubriformis larvae. A diet based on chopped oaten and lucerne hay (experiment 1) or a pelleted diet based on lucerne hay and grain products (experiment 2), was offered in amounts to sustain a moderate gain in body weight, or was reduced step-wise to cause a loss in body weight. Worm egg counts were determined weekly. The reduction in feed on offer resulted in a mean weight loss of 4.0 kg over 9 weeks (experiment 1) or 4.8 kg over 7 weeks (experiment 2). Based on worm egg counts, there was no indication of a change in immunity to T colubriformis in either of the experiments. These results suggest that acquired immunity to T colubriformis in adult sheep that are exposed to infection is maintained during periods of moderate loss of weight associated with inadequate nutrition.  相似文献   

Reducing the effects of clover disease by strategic grazing of pastures     

DL LITTLE 《Australian veterinary journal》1996,73(5):192-193

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Immunomagnetic Selection of Acrosome-reacted Bovine Spermatozoa Using Anti-acrosin Antibodies     

CA Thomas  DL Garner  TV McCormick 《Reproduction in domestic animals》1996,31(2):373-378

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Transmission of bovine viral diarrhea virus to adult goats from persistently infected cattle.   总被引：1，自引：0，他引：1  

Charles C Broaddus  G Reed Holyoak  Lionel Dawson  D L Step  Rebecca A Funk  Sanjay Kapil 《Journal of veterinary diagnostic investigation》2007,19(5):545-548

The transmission of bovine viral diarrhea virus (BVDV) from persistently infected (PI) heifers to adult seronegative goats was examined in this study. Ten seronegative adult goats were exposed to 4 PI heifers. None of the goats developed any clinical signs but all goats seroconverted by 42 days after exposure to the PI cattle. Results indicate that goats are susceptible to BVDV infection when housed with PI cattle.  相似文献   

Number,causes and destinations of horses leaving the Australian Thoroughbred and Standardbred racing industries     

PC Thomson  AR Hayek  B Jones  DL Evans  PD McGreevy 《Australian veterinary journal》2014,92(8):303-311

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Temperature-induced momentum-dependent spectral weight transfer in Bi2Sr2CaCu2O8+delta     

Z Shen  PJ White  DL Feng  C Kim  GD Gu  H Ikeda  R Yoshizaki  N Koshizuka 《Science (New York, N.Y.)》1998,280(5361):259-262

Angle-resolved photoemission data from the cuprate superconductor Bi2Sr2CaCu2O8+delta above and below the superconducting transition temperature Tc reveal momentum-dependent changes that extend up to an energy of about 0.3 electron volt, or 40kTc (where k is the Boltzmann constant). The data suggest an anomalous transfer of spectral weight from one momentum to another, involving a sizable momentum transfer Q approximately (0.45pi, 0). The observed Q is intriguingly near the charge-order periodicity required if fluctuating charge stripes are present.  相似文献