Evidence that the eumelanin restrictor genes (Co) and (Db) are present in the genome of the Buff Rock bantam     

W. C. Carefoot 《British poultry science》1995,36(2):205-207

1. An investigation was conducted among the progeny from crosses between Buff Rock and Light Sussex bantams, and between Buff Rock and Gold‐Pencilled Hamburgh bantams in order to ascertain whether the eumelanin restrictor genes Columbian (Co) and Dark‐brown (Db) were present in the genome of the Buff Rock.

2. The Light Sussex and Gold‐Pencilled Hamburgh bantams used in this study were known to be Co/ Co db⁺ / db⁺ and co⁺ / co⁺ Db/ Db respectively.

3. In both F₂ generations the least eumelanin restricted segregants were as the parent mated with the Buff Rock, thus demonstrating the Buff Rock bantam tested to be Co/ Co Db/ Db, or possess similar alleles at these loci.

4. The Buff Rock bantam male was found to be heterozygous for a eumelanin inhibitor gene which appears to be dominant white (I).  相似文献   

Efficacy of doramectin against experimental infections by some nematode parasites in cattle in New Zealand     

Watson TG  Hosking BC  Hooke FG 《New Zealand veterinary journal》1995,43(2):67-69

A study was undertaken to determine the efficacy of the novel avermectin, doramectin, against experimental larval and adult infections of three species of nematode parasite important to cattle production in New Zealand. Eighteen worm-free dairy bull beef calves were randomly allocated on live weight to three similar treatment groups. Each calf was given 30,000 Ostertagia ostertagi, 20,000 Cooperia spp. and 10,000 Trichostrongylus axei infective larvae as a single dose. One group was treated with doramectin 6 days after infection while the remaining groups received saline or doramectin 27 days after infection. Given as a single subcutaneous injection behind the ear, doramectin at 200 microg/kg removed 99.9-100% of adult and larval stages of O. ostertagi, Cooperia spp. and T. axei when compared to infections established in untreated controls (p<0.001). No adverse reactions were observed following treatment in the doramectin-treated animals. No injection site lesions were found by palpation following treatment or by injection site examination at necropsy.  相似文献   

Observations on hypoglycaemia associated with a hepatoma in a cat     

Thompson JC  Hickson PC  Johnstone AC  Jones BR 《New Zealand veterinary journal》1995,43(5):186-189

Disorientation, muscle fasciculations and weakness seen in a 12-year-old neutered female domestic shorthaired cat were attributed to hypoglycaemia associated with a large hepatoma. Glucagon tolerance tests on this cat and a healthy cat showed that their plasma glucose concentrations increased and decreased at about the same rate. Plasma insulin concentrations in the healthy cat increased and decreased in parallel with the plasma glucose concentration. In the affected cat, plasma insulin concentrations increased initially but decreased more rapidly. Reflecting these observations, the amended insulin to glucose ratios in the affected cat were much lower than those of the healthy cat, until the 4-hour sample. Serum somatostatin, somatomedin and gastrin concentrations were measured but no conclusions as to pathogenesis of the hypoglycaemia could be made. The alterations in insulin secretion in the affected cat suggested that altered hormonal control of glucose homeostasis may have occurred with this tumour.  相似文献   

Engineering and the national science foundation     

Willenbrock FK 《Science (New York, N.Y.)》1984,223(4634):345

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Large yearly production of phytoplankton in the Western bering strait   总被引：1，自引：0，他引：1  

Sambrotto RN  Goering JJ  McRoy CP 《Science (New York, N.Y.)》1984,225(4667):1147-1150

Production in the western Bering Strait is estimated at 324 grams of carbon per square meter per year over 2.12x 10(4) square kilometers. An ice-reduced growing season makes this large amount of primary production unexpected, but it is consistent with the area's large upper trophic level stocks. The productivity is fueled by a cross-shelf flow of nutrient-rich water from the Bering Sea continental slope. This phytoplankton production system from June through September is analogous to a laboratory continuous culture.  相似文献   

Navy scuttles disposal plan for nuclear subs     

Norman C 《Science (New York, N.Y.)》1984,224(4656):1412

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Pork barrel scorecard     

Norman C 《Science (New York, N.Y.)》1984,226(4674):519

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Preventing nuclear war     

Malone TF 《Science (New York, N.Y.)》1984,223(4634):340

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Universities gag on research controls     

Norman C 《Science (New York, N.Y.)》1984,224(4645):134

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Companies Move to Rescue School Science: Corporate partnerships with high schools as well, as donations of equipment and training, have been spreading rapidly     

Holden C 《Science (New York, N.Y.)》1984,225(4669):1456-1457

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