Presumptive 1/29 autosomal translocation in Australian cattle.     

W L Potter  P C Upton  A W Blackshaw 《Australian veterinary journal》1979,55(5):209-213

A cytogenetical study was made of 9 descendants of a Charolais bull, heterozygous for a presumptive 1/29 translocation, three of the dams of some of these descendants, and three unrelated bulls which were mated to some of the descendants. Photographic karyotypes of Giemsa stained and C-banded chromosomes were prepared for each animal. The dams of the progeny showed no chromosomal abnormalities indicating that translocations were inherited from the sire. Three daughters of the Charolais bull and two of his grand daughters were heterozygous for the translocation, with a modal chromosomal number of 59, while the remaining three daughters and their progeny possessed normal karyotypes. No phenotypic abnormalities were observed in the animals examined. Measurements of the arms of the chromosomes suggested that the translocation chromosome (a large submetacentric) contained chromosomes 1 and 29. The submetacentric translocation chromosome had a single C-band, the two submetacentric X chromosomes showed no C-bands and each acrocentric autosome had a single C-band. All cattle heterozygous for the translocation showed normal fertility.  相似文献   

Factors governing the toxicity of putative synaptic transmitters and their analogues when injected into the haemocoel of adult male Lucilia sericata     

Richard J. Hart  Charles Potter  Roger G. Wilson 《Pest management science》1977,8(6):722-734

Acetylocholine, arecoline, 2-(dimethylamino)ethyl acetate, L-glutamic acid, L-4-methyl-eneglutamic acid, (±)-quisqualic acid, 4-aminobutyric acid, and dicrotophos were injected into the haemocoel of adult male Lucilia sericata. Large doses of the putative transmitters and their analogues were required for toxicity. The water soluble organo-phosphate dicrotophos was much more toxic than any of the other compounds. Electrophysiological experiments indicated that the putative transmitters were reaching their presumed site of action in the nervous system and that their toxicity could be correlated with the intensity and duration of their effect at this site. Biochemical measurements of the rate of loss of the putative transmitters from the haemolymph indicate that, in vivo, the test insect possesses efficient mechanisms for removing these compounds from the system being studied. It is concluded that the low toxicity of the putative transmitters, which are presumed to interact reversibly with post synaptic receptor sites, may be largely due to their rapid removal from the system, resulting in a rapid fall in concentration at the receptor site.  相似文献   

Relationship between condition score, physical measurements and body fat percentage in mares   总被引：15，自引：0，他引：15  

D R Henneke  G D Potter  J L Kreider  B F Yeates 《Equine veterinary journal》1983,15(4):371-372

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4 THE EFFECTS OF EXERCISE AND INJURY ON CHONDROITIN SULFATE AND KERATAN SULFATE CONTENT IN EQUINE SYNOVIAL FLUID.     

MP  Brown  AHK Plaas  JD Sandy  JA Hernandez  KA Merritt  . 《Veterinary surgery : VS》2003,32(6):599-599

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Effect of oral Escherichia coli inoculation on performance of young turkeys     

G P Schmidt  C H Domermuth  L M Potter 《Avian diseases》1988,32(1):103-107

A strain of Escherichia coli isolated from the yolk sac of stunted turkey poults was administered orally to day-old large white poults. Poults were inoculated with either 0.1 ml of sterile broth or 0.1 ml of a 10(-2) dilution of a 24-hr E. coli culture containing 3.4 x 10(8) viable bacteria per ml. Two levels of dietary protein (28 or 22%) were fed from 1 day to 3 weeks of age. Following E. coli inoculation of 3.4 x 10(5) viable bacteria at day one, body weight gain and feed consumption from 0 to 3 weeks of age were numerically increased 4.5 and 2.1%, respectively, and feed efficiency was significantly increased 2.4%. E. coli had a greater effect on performance of poults fed the 28% protein diet than on poults fed the 22% protein diet. Metabolism studies, conducted from 7 to 10 and from 17 to 20 days postinoculation, showed no significant changes in the measurements of nutrient utilization due to E. coli other than a 17% increase in nitrogen retention from 17 to 20 days by those poults fed the 28% protein diet.  相似文献   

Effects of cecal fistulation upon nutrient digestion and indicator retention in horses     

R E Pulse  J P Baker  G D Potter 《Journal of animal science》1973,37(2):488-492

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A plasma reference index for predicting limiting amino acids of sheep and rats     

E L Potter  D B Purser  W G Bergen 《Journal of animal science》1972,34(4):660-671

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The changing face of foodborne disease.     

M E Potter 《Journal of the American Veterinary Medical Association》1992,201(2):250-253

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Fertility of stallion spermatozoa isolated on albumin gradients     

J.A. Pruitt MS  J.L. Kreider PhD  G.D. Potter PhD  J.M. Bowen MS  DVM  J.W. Evans PhD 《Journal of Equine Veterinary Science》1988,8(2)

Fertility of stallion semen extended with bovine serum albumin (BSA) sucrose extender or cream-gelatin extender was compared. Pregnancy rates were 95% of 47 mares and 86% of 46 mares inseminated with BSA-sucrose and creamgelatin extended semen, respectively. Foaling rates and cycles per conception were not significantly different between treatment groups.Semen from 5 mature stallions was used in an attempt to isolate a population of highly motile spermatozoa. Immediately following collection, samples were evaluated for motility and forward movement. Seven to 10 ml of semen, extended 1:1 with BSA-sucrose extender, were pipetted onto BSA medium separation columns. After 1 hour incubation at 37°C, the top, middle and bottom layers were separately withdrawn from each separation column and pooled, respectively. A marked decrease (P<.001) was noted in the mean motility of spermatozoa in the top layer (35%) as compared to the mean pre-incubation motility (59%). Spermatozoa from middle and bottom layers were significantly (P<.001) more motile (70.6 and 87%) than those from the top layer and pre-incubation samples. Rate of forward movement (RFM) of spermatozoa in lower fractions was higher (P<.001) than RFM of spermatozoa in the top layer. Concentration of spermatozoa decreased (P<.001) as the concentration of BSA in the medium increased.  相似文献   

Effects of insulation on the temperature within farrowing huts and the weaning weights of piglets reared on a commercial outdoor pig unit     

Randolph CE  O'Gorman AJ  Potter RA  Jones PH  Miller BG 《The Veterinary record》2005,157(25):800-805

The air temperatures inside uninsulated and insulated huts were recorded on an outdoor pig unit in the south of England between September 1997 and September 1998, and the herd's production parameters were also recorded. During the summer the temperatures inside some of the uninsulated huts exceeded 45 degrees C, but the temperatures inside the insulated huts were lower and fluctuated less. Despite the high temperatures, the weaning weight of piglets reared in the uninsulated huts were often higher than those of the piglets reared in the insulated huts, possibly as a result of the higher mortality of small piglets in the uninsulated huts, especially during the winter. The weaning weights of the piglets were higher during the summer.  相似文献