氧化应激与疾病     

Clifford A Adams  武书庚  齐广海  李海涛 《饲料与畜牧》2009,(4):20-22

2．4胎衣不下（RIM） 该症是导致抗氧化状况衰竭的第一步。奶牛RFM可引起子宫内膜炎、连续的卵巢周期延误、妊娠推迟等系列损失。  相似文献   

Evaluation of an enzyme-linked immunosorbent assay for diagnosis of trichinellosis in swine.     

M L van der Leek  J B Dame  C L Adams  K D Gillis  R C Littell 《American journal of veterinary research》1992,53(6):877-882

Experimental and field trials were conducted to evaluate an ELISA for its ability to detect Trichinella-infected domestic swine and to compare ELISA results with muscle-digestion test results. The ELISA used was a commercial double-antibody kit, containing an excretory-secretory antigen, and was evaluated principally for epidemiologic use. Experimentally induced infection in swine (4 groups of 3 pigs each; inoculated with 0, 50, 500 or 5,000 larvae) was detected as early as postinoculation week 4, with seroconversion of all inoculated swine by postinoculation week 8. The rate of seroconversion appeared to be affected by initial larval dose, time after inoculation, and immunocompetence of the individual host. Determination of antibody kinetics generally revealed rapidly increasing antibody titer, followed by its steady decrease in most pigs. Once seropositive, however, all pigs remained seropositive for the duration of the 10-week study. Presence of muscle larvae was confirmed in all infected pigs at termination of the study. We recognize that the experimental conditions may not be truly representative of those under which natural infection develops in pigs; however, the ELISA detected an infected pig with muscle larval density of 0.87 larvae/g of tissue. Results of a field trial (n = 310) indicated no muscle digestion test-positive pigs (35 g of diaphragm muscle digested/pig), but 3 samples tested positive by ELISA for specificity of 99.0%.  相似文献   

Bilateral ureterocystostomy in a 450-kg horse with ectopic ureters.     

K R Squire  S B Adams 《Journal of the American Veterinary Medical Association》1992,201(8):1213-1215

A 450-kg yearling Clydesdale filly was determined to have bilateral ectopic ureters. The resulting incontinence caused severe malodorous perineal dermatitis. Bladder capacity was measured at 800 ml. The urethral sphincter lacked tone, and the horse was seen to urinate in a normal manner only 2 or 3 times a week. A midline celiotomy was performed, and the ureters were identified by cannulation from the ectopic openings. The ureters were ligated, and the cut ends were anastomosed to the dorsal bladder surface by an extravesicular end-to-side technique. A partial thickness seromuscular layer of the bladder was sutured over the ureters in a cranial direction from the anastomosis site for 15 mm. This fixed the ureters to the dorsal surface of the bladder and protected the anastomosis site from tension. After surgery, the horse urinated n a normal manner many times a day. Urinary incontinence continued, but gradually improved. Bladder capacity increased over 13 months to 4.3 L. Surgical (urethral extension) and medical (phenylpropanolamine and estrogen) treatments were instigated to increase urethral sphincter tone. Urinary incontinence continued to improve and, at 11 months after surgery, incontinence was negligible, and the perineal dermatitis had healed.  相似文献   

Selenium levels of beef cattle in southeastern british columbia relative to supplementation and type of pasture     

Fenimore RL  Adams DS  Puls R 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(2):41-45

Moderate to extremely low levels of selenium in hay were related to marginally deficient levels of selenium in sera from cattle in the Windermere Valley of southeastern British Columbia. Deficiency was most pronounced in cattle fed local hay during the winter or grazed on fertilized/irrigated pastures. Cattle on range had adequate levels of serum selenium. When sodium selenite was fed at 1.0 and 3.5 mg per head per day, serum selenium levels increased commensurate with the dose. Clinical observations indicated that a variety of clinical problems disappeared after injection or supplementation with selenium/vitamin E.  相似文献   

Tracheal foreign body in a cat          下载免费PDF全文

Levitt L  Clark GR  Adams V 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(3):172-173

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The effect of level of nutrition on the development of resistance to Haemonchus contortus in sheep     

J A Roberts  D B Adams 《Australian veterinary journal》1990,67(3):89-91

Merino wether weaners, 5-months old at the start of the experiment and fed lucerne-based pellets at 600 g per head per day, developed resistance to Haemonchus contortus given as a continuous or "trickle" infection at the rate of 500 larvae 3 times per week over a period of 17 weeks. By contrast, the development of resistance was impaired in weaners fed pellets at 400 g per head per day. Low food intake and protein-energy deprivation, therefore, have a major effect in impairing the development and expression of host-protective immunity against haemonchosis. The point at which low food intake causes outbreaks of haemonchosis in sheep at pasture is critical in determining procedures for prevention and control of the disease.  相似文献   

The effect of dietary bacitracin on the incidence of streptococcus faecalis subspecies liquefaciens and related streptococci in the intestines of young chicks     

Ella M. Barnes  G. C. Mead  G. S. Impey  B. W. Adams 《British poultry science》1978,19(6):713-723

1. A study has been made of changes occurring in the numbers and types of faecal streptococci in the intestines of chicks from hatching to 23 d of age, when fed on a diet containing 50 mg bacitracin/kg.

2. It was found that Streptococcus faecalis sub‐species liquefaciens predominated in chicks prior to feeding and in control birds the organism remained as a significant part of the flora throughout the experiment.

3. Strep. faecalis s.s. liquefaciens was not found after the first week in birds given dietary bacitracin.

4. Although outnumbered initially in the caeca by Strep, faecalis s.s. liquefaciens, other streptococci were present at 10⁶ to 10⁷/g contents from 14 d onwards in both control and bacitracin‐treated birds; these included Strep. faecium biotypes and two other unidentified but related groups.

5. Tests made in vitro showed that Strep. faecalis s.s. liquefaciens was more sensitive to bacitracin than Strep. faecium.

6. The possible effects of Strep. faecalis s.s. liquefaciens on the developing bird are discussed.  相似文献   

Simulating forest cover change in the northeastern U.S.: decreasing forest area and increasing fragmentation     

Adams  Alison B.  Pontius  Jennifer  Galford  Gillian  Gudex-Cross  David 《Landscape Ecology》2019,34(10):2401-2419

Landscape Ecology - Understanding how the Northern Forest landscape has changed and is likely to change, both in terms of forest extent and forest configuration, has important implications for...  相似文献   

Ranch-management factors associated with antibody seropositivity for Neospora caninum in consignments of beef calves in Texas, USA     

Barling KS  McNeill JW  Paschal JC  McCollum FT  Craig TM  Adams LG  Thompson JA 《Preventive veterinary medicine》2001,52(1):53-61

A study was conducted with a 1998 retained-ownership population of Texas (USA) beef calves to determine the ranch-management practices associated with calf seroprevalence to Neospora caninum. Management practices of 76 Texas ranches that consigned 760 calves to a retained-ownership feedlot program were reviewed from a mailed questionnaire. Ninety-nine of 760 (13%; 95% CI, 9.4%, 17.7%) calves were positive to N. caninum and 59% of the ranches consigned at least one positive calf. In the logistic multiple-regression model which controlled for overdispersion, increased odds of calf-level seropositivity was associated with seasonal calving patterns, with stocking>1cow/calfunit/2.2ha, using a round-bale feeder, allowing wildlife access to the weaning supplement, and self-reared replacement heifers. However, decreased odds of seropositivity was associated with using a cattle-working dog and with using a self-contained cattle feeder. There was substantial overdispersion due to ranch.  相似文献   

Employment of male and female graduates of US veterinary medical colleges, 1998     

Wise JK  Adams CL 《Journal of the American Veterinary Medical Association》1999,214(6):788-789

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