Significance for exercise capacity of some electrocardiographic findings in racehorses     

CM KING  DL EVANS†  RJ ROSE 《Australian veterinary journal》1994,71(7):200-202

Summary Various cardiorespiratory and metabolic indices were assessed during treadmill exercise in Thoroughbred and Standardbred racehorses with T wave changes in 4 or more leads on the electrocardiogram or second-degree atrio-ventricular (AV) block, and in horses that had no abnormalities on clinical examination, resting electrocardiography or upper respiratory tract endoscopy. No significant differences in heart rate, plasma lactate concentration, arterial blood gases, oxygen uptake, run time, peak velocity, or blood and red cell volumes were found between normal horses and horses with T wave changes or second-degree AV block. These results indicate that some electrocardiographic findings that are considered by some clinicians to indicate cardiac dysfunction, may have little effect on exercise capacity.  相似文献   

Infectivity of Cryptosporidium sp isolated from wild mice for calves and mice   总被引：4，自引：0，他引：4  

P H Klesius  T B Haynes  L K Malo 《Journal of the American Veterinary Medical Association》1986,189(2):192-193

A study was conducted to determine the incidence of cryptosporidiosis in wild mice (Mus musculus) and the infectivity of oocysts from their feces for susceptible calves. The presence of oocysts and the duration of shedding of oocysts in the feces were evaluated in 115 wild mice. Approximately 30% of the mice shed Cryptosporidium sp oocysts, without evidence of clinical infection; recurrence of oocyst shedding was found in about 50% of the mice. Oocysts from the feces of naturally infected mice were infective for calves and mice. Calves began shedding oocysts at 7 days and shed oocysts for about 10 days. Nonfatal, clinical cryptosporidiosis developed in 7 infected calves. The mice began shedding oocysts at 6 days and shed oocysts for 12 days. Fatalities or clinical infection did not develop in 5 infected mice. The results indicated that Cryptosporidium-infected wild mice may be a source of cryptosporidiosis in susceptible calves.  相似文献   

Effect of intracarotid infusion of prostaglandin F2alpha on plasma luteinizing hormone, testosterone and glucocorticoid concentrations in bulls     

N B Haynes  T E Kiser  H D Hafs  T D Carruthers  W D Oxender  M S McCarthy 《Journal of animal science》1977,45(5):1102-1107

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Review on physiological pathways of foliar absorption     

R.J. Haynes  K.M. Goh 《Scientia Horticulturae》1977,7(4):291-302

This review concerns the movement of foliar-applied substances through the leaf with an emphasis on plant nutrients. The movement of substances through the cuticle is well documented and is only outlined here. Knowledge of subsequent movement of substances throughout the leaf is rather sketchy. The various possible pathways of movement are outlined and discussed. Both symplastic and apoplastic movement seem possible. Ionic uptake and movement within leaves is complicated by photosynthesis which is occurring within many of the cells and by complex ionic movement associated with stomatal movement.  相似文献   

Dermal cellular responses of helminth-free and Ostertagia ostertagi-infected calves to intradermal injections of soluble extracts from O. ostertagi L3 larvae     

D A Cross  P H Klesius  L A Hanrahan  T B Haynes 《Veterinary parasitology》1987,23(3-4):257-264

Twelve calves were raised helminth-free until 9 weeks of age when six were orally inoculated with 100,000 Ostertagia ostertagi infective stage larvae (L3). Three uninfected and three experimentally infected calves received intradermal injections of sterile saline and soluble larval extract (SLE) from O. ostertagi L3 with a protein concentration ranging from 1 to 200 micrograms ml-1. Biopsies were performed 48 h post-injection. A kinetic study was performed on the remaining six calves, three infected and three uninfected, using a 100 micrograms ml-1 concentration of SLE and taking biopsies 1, 4, 8, 12, 24, and 72 h post-injection at both the saline and SLE-injected sites. All calves had an immediate wheal and increase in skin thickness at the SLE-injected sites. The numbers of eosinophils infiltrating SLE-injected sites as compared to saline-injected sites were significant in both uninfected and infected calves, but the infected calves had significant numbers to a wider range of SLE concentrations and had significantly higher numbers than uninfected calves in the kinetic study. Infected calves also had significant numbers of basophils in the dose response study at concentrations of 5 and 100 micrograms ml-1 SLE. Neutrophil infiltration was similar in both groups and was significant at SLE-injected sites early in the kinetic study. Detectable mast cells were decreased in SLE-injected sites of infected animals and perivascular accumulation of mononuclear and some polymorphonuclear cells was observed in the deep dermis of infected animals.  相似文献   

Amyloidosis in an Angora goat     

VL THAM  CM BUNN 《Australian veterinary journal》1992,69(2):40-41

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Effect of third carpal slab fracture and repair on racing performance in Thoroughbred horses: 31 cases (1977-1984)     

G S Martin  P F Haynes  J R McClure 《Journal of the American Veterinary Medical Association》1988,193(1):107-110

Between 1977 and 1984, 31 Thoroughbred horses (mean age, 2.8 years) were surgically treated for slab fractures of the third carpal bone. All fractures involved the articular surfaces of the intercarpal and the carpometacarpal joints in a frontal plane and had a cuboidal or slab shape. In 20 of the horses, the bone was fractured during racing and in 8 of the horses, the bone was fractured during race training. The right limb was affected more frequently than was the left limb (24 vs 7, P less than 0.05). Twenty-one (67.6%) horses raced at least once after recovery from the surgery. Data were available from 11 claiming horses that had raced at least twice before their injuries and 4 times after recovery. A claiming horse is one that competes where any horse entered is subject to being purchased for the designated amount of the claiming race; therefore, each race tends to automatically attract entrants of similar ability. In this group of 11 horses, claiming value decreased from a mean of $13,900 to a mean of $6,500 (P less than 0.05), and the mean finish position was 5.8 +/- 3.16 before injury and 5.8 +/- 3.30 after recovery. The mean claiming value for horses that had not raced before injury, but had raced after recovery (n = 5) was $8,150.  相似文献   

From the editor     

Richard P. Haynes 《Agriculture and Human Values》1984,1(4):1-2

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α‐6 Integrin Expression in Bovine Spermatogonial Cells Purified by Discontinuous Percoll Density Gradient     

FRO de Barros  RA Worst  GCP Saurin  CM Mendes  MEOA Assumpção  JA Visintin 《Reproduction in domestic animals》2012,47(6):887-890

The study of spermatogonial stem cells (SSCs) provides a model to better understand adult stem cell biology. Besides the biomedical potential to perform studies of infertility in many species, SSCs hold a promising application at animal transgenesis. Because stem cells are thought to be associated with basement membranes, expression of α‐6 integrin has been investigated as a marker of type A spermatogonial cells, which are considered SSCs because of their undifferentiated status and self‐renewal ability. In this manner, the aim of this study was to isolate type A SSCs from adult bulls by a two‐step enzymatic procedure followed by a discontinuous Percoll density gradient purification and verify the expression of α‐6 integrin by flow cytometry and real‐time RT‐PCR before and after Percoll purification. Spermatogonial cells were successfully obtained using the two‐step enzymatic digestion. An average of 1 × 10⁵ viable cells per gram of testis was isolated. However, the discontinuous Percoll did not purify isolated cells regarding α‐6 integrin expression. Flow cytometry analysis demonstrated no differences in the α‐6 integrin expression between cell samples before and after Percoll purification (p = 0.5636). The same was observed in the real‐time PCR analysis (p > 0.05). In addition to α‐6 integrin, the expression of GFRa‐1 and PGP9.5, known bovine SSCs markers, was detected in all samples studied. Considering that Percoll can reduce cell viability, it is possible to conclude that Percoll density gradient is not suitable to purify bovine SSC, according to α‐6 integrin expression.  相似文献   

樱类品种观赏性状初步研究     

刘晓莉  赵绮  舒美英  蔡建国 《福建林业科技》2012,39(2):123-127

以宁波仗锡樱花基地引种的15个樱类品种为试材,研究其在宁波地区的开花物候期和观赏性状表现。结果表明:在宁波露地栽植条件下,多数品种的始花期集中在3月下旬—4月中旬,各品种单株花期12～21 d不等,总花期维持20～35 d之间。始花期以东京樱最早,虎尾樱最晚,红叶樱、冈目、关山较晚;花期以关山最长,八重红大岛次之,虎尾樱最短。重瓣品种中白菊樱、关山、八重红大岛和普贤象花大、色艳、花型美丽、花量大、植株健壮;单瓣品种中一叶樱、染井吉野和东京樱花量大、开花时间早、生长势好,可推广种植。  相似文献