野性斯派塞     

CC 《百姓》2011,(10)

苍绿的草原一望无际,起伏的山丘上搭着一道道浓绿的葡萄架,远处成群的牛羊悠闲地吃着草,星星点点的白色房屋,好似一幅静美的天然油画,而澳大利亚五星级牧场斯派塞就坐落于这绿色深处。  相似文献   

Sum rules and interlayer conductivity of high-Tc cuprates     

DN Basov  SI Woods  AS Katz  EJ Singley  RC Dynes  M Xu  DG Hinks  CC Homes  M Strongin 《Science (New York, N.Y.)》1999,283(5398):49-52

Analysis of the interlayer infrared conductivity of cuprate high-transition temperature superconductors reveals an anomalously large energy scale extending up to midinfrared frequencies that can be attributed to formation of the superconducting condensate. This unusual effect is observed in a va- riety of materials, including Tl2Ba2CuO6+x, La2-xSrxCuO4, and YBa2Cu3O6.6, which show an incoherent interlayer response in the normal state. Midinfrared range condensation was examined in the context of sum rules that can be formulated for the complex conductivity. One possible interpretation of these experiments is in terms of a kinetic energy change associated with the superconducting transition.  相似文献   

Bioavailability of magnesium in beef cattle fed magnesium oxide or magnesium hydroxide     

G M Davenport  J A Boling  N Gay 《Journal of animal science》1990,68(11):3765-3772

Two experiments were conducted to compare Mg bioavailability from Mg oxide (MgO) vs Mg hydroxide (Mg(OH)2) fed in either a completely mixed diet or a mineral supplement. In Exp. 1, these Mg sources were incorporated into completely mixed diets and offered to 15 steers (282 kg) allotted to three treatments: control diet containing .19% Mg, control plus .2% added Mg as MgO, or control plus .2% added Mg as Mg(OH)2. Each calf was fed 5 kg/d of the respective diet during 10-d adjustment and 7-d collection periods. Blood samples were collected on d 1, 3 and 7. Mg supplementation increased (P less than .01) fecal and urinary Mg excretions, whereas apparent Mg absorption (%) and retention were similar (P greater than .10) for all treatments. Plasma Mg concentrations were similar (P less than .10) for calves supplemented with MgO and Mg(OH)2 but were higher (P less than .05) for Mg supplemented than for control calves on d 7. In Exp. 2, these Mg sources were incorporated into mineral supplements and offered free choice to 30 spring-calving beef cows gazing tetany-inducing pastures from March 6 to May 1. Each of three groups of 10 cows was assigned to a 5.7-ha tall fescue pasture and offered either a control supplement or a supplement containing 40% MgO or Mg(OH)2. Blood samplers were collected on d 0, 7, 14, 28, 42 and 56. Plasma Mg concentrations were not different (P greater than .10) for cows offered MgO and Mg(OH)2 but were higher (P less than .01) for Mg-supplemented than for control cows on d 28, 42 and 56.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Crooked calf disease: a histological and histochemical examination of eight affected calves     

L C Abbott  R H Finnell  G F Chernoff  S M Parish  C C Gay 《Veterinary pathology》1986,23(6):734-740

Macroscopic, histopathologic, and histochemical investigations were made on a group of eight neonatal Angus X Hereford calves, selected from an ongoing outbreak of crooked calf disease among calving heifers. Arthrogryposis of the forelimbs was seen to varying degrees in all eight animals, and torticollis was present in six calves. Histopathology, using hematoxylin and eosin stain, did not reveal any striking or consistent lesion in the affected animals; the majority of the tissues sampled were normal. Muscle samples were processed for adenosine triphosphatase (ATPase) and NADH-tetrazolium reductase (NADH-tr) histochemistry, and the data suggest that a primary myopathy is not responsible for the congenital anomalies in the affected calves.  相似文献   

Cross-reactive antibody in immunity to colisepticemia in calves   总被引：1，自引：0，他引：1  

M L Wickstrom  C C Gay  J L Hodgson  P R Widders  D Schaeffer  R Lee  L B Corbeil 《Veterinary microbiology》1987,13(3):259-271

Cattle were immunized with a uridine diphosphate galactose epimerase deficient mutant of Escherichia coli to prepare antiserum cross-reactive with different serotypes of E. coli. Hypogammaglobulinemic calves were given bovine anti-J5 serum before oral challenge with virulent E. coli derived from a septicemic calf. Passively immunized calves had delayed and decreased bacteremia compared with calves given saline before challenge. Calves given antiserum also lived longer than control calves. A second experiment using ampicillin and antibody to treat colisepticemia also showed increased survival in anti-serum-treated calves. Decreased bacteremia was probably not due to the killing of the challenge strain by antibody and complement, as the strain was serum-resistant. However, anti-J5 serum did increase phagocytosis of the challenge strain of E. coli (JL9) by bovine neutrophils. Thus, partial protection by antiserum was probably due to increased clearance of bacteria as well as neutralization of endotoxin.  相似文献   

Decreased colostral immunoglobulin absorption in calves with postnatal respiratory acidosis   总被引：3，自引：0，他引：3  

T E Besser  O Szenci  C C Gay 《Journal of the American Veterinary Medical Association》1990,196(8):1239-1243

The effect of postnatal acid-base status on the absorption of colostral immunoglobulins by calves was examined in 2 field studies. In study 1, blood pH at 2 and 4 hours after birth was related to serum IgG1 concentration 12 hours after colostrum feeding (P less than 0.05). Decreased IgG1 absorption from colostrum was associated with respiratory, rather than metabolic, acidosis, because blood PCO2 at 2 and 4 hours after birth was negatively related to IgG1 absorption (P less than 0.05), whereas serum bicarbonate concentration was not significantly related to IgG1 absorption. Acidosis was frequently observed in the 30 calves of study 1. At birth, all calves had venous PCO2 value greater than or equal to 60 mm of Hg, 20 of the calves had blood pH less than 7.20, and 8 of the calves had blood bicarbonate concentration less than 24 mEq/L. Blood pH values were considerably improved by 4 hours after birth; only 7 calves had blood pH values less than 7.20. Calves lacking risk factors for acidosis were examined in study 2, and blood pH values at 4 hours after birth ranged from 7.25 to 7.39. Blood pH was unrelated to IgG1 absorption in the calves of study 2. However, blood PCO2 was again found to be negatively related to colostral IgG1 absorption (P less than 0.005). Results indicate that postnatal respiratory acidosis in calves can adversely affect colostral immunoglobulin absorption, despite adequate colostrum intake early in the absorptive period.  相似文献   

Environmental and managerial determinants of somatic cell counts and clinical mastitis incidence in Ohio dairy herds     

Paul C. Bartlett  Gay Y. Miller  Susan E. Lance  Lawrence E. Heider 《Preventive veterinary medicine》1992,14(3-4):195-207

A stratified-random sample of 48 Ohio dairy herds participated in a 1-year disease monitoring survey to study herd management and environmental conditions affecting udder infection and clinical mastitis incidence. The mean monthly bulk-tank somatic cell count was used as an indicator of overall udder infection. Clinical incidence was determined by monthly on-farm interviews with the dairy producers. Management and environmental conditions were assessed by direct observation as well as by personal interview of dairy managers. The final multivariable analysis-of-variance model of log bulk-tank somatic cell count had an R² value of 0.43. Lower log bulk-tank somatic cell count was found in herds with hired milkers, a clean and dry cow exercise area, clean teats following milking and fewer milking cows. The number of months spent on pasture was also significant. The final model for clinical mastitis incidence had an R² value of 0.38. Less clinical mastitis was found on farms where straw bedding was used, pre-dip was not used, where there were fewer cows, fewer person-hours per cow were spent milking cows, a greater percentage of calvings occurred in the designated calving facility, and cows spent fewer months per year on pasture. Other potentially important disease determinants could not be included in the final models because of limited sample size relative to the model degrees of freedom (six each).  相似文献   

Veterinary service usage and animal ownership in Ohio, U.S.A.: Results of telephone surveys in 1983 and 1984     

Gay Y. Miller  Elizabeth Spangler  C. Richard Dorn 《Preventive veterinary medicine》1987,4(5-6):435-446

A telephone survey of three sub-populations in Ohio was conducted to compare the utilization of veterinary services in 1982 with 1983 and to characterize animal ownership. A response rate of approximately 90% was achieved for all three sub-populations namely (1) food-animal producers, (2) horse owners and (3) pet owners. There was no significant difference between the percentage of respondents using veterinary services in 1982 and 1983. In both years, over 85% of dairy producers purchased veterinary services compared with approximately 62% for beef producers, approximately 70% for swine producers, and over 97% for horse owners. In 1983, approximately 69% sheep producers, 50% of goat producers, 81% of dog owners, 67% of cat owners, 12% of bird owners and none of the fish owners used veterinary services during the previous year. The 1983 median expenditures for veterinary services per farm or household using veterinary services were $465 for horses, $450 for dairy cattle, $111 for beef cattle, $115 for swine, $66 for sheep, $0 for goats, $75 for dogs, $44 for cats and $18 for pet birds. The average number of times animals were seen by a veterinarian varied by species but did not vary much from year to year. For all three groups, preventive services were used more frequently than were treatment and surgical services.  相似文献   

Medical Infrared Imaging (Thermography) of Type I Thoracolumbar Disk Disease in Chondrodystrophic Dogs     

Brian P. Grossbard DVM  Catherine A. Loughin DVM  Diplomate ACVS  ACCT  Leonard J. Marino MD  FAAP  Joseph Sackman  Scott E. Umbaugh BSE  MSEE  PhD  Patrick S. Solt BSEE  MSCS  Jakia Afruz BSAPECE  MSAPECE  Peter Leando PhD  DSc  DAc  Martin L. Lesser PhD  EMT‐CC  Meredith Akerman MS 《Veterinary surgery : VS》2014,43(7):869-876

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A nation-wide epidemiological study of acute bovine respiratory disease in France   总被引：1，自引：0，他引：1  

Emilie Gay  Jacques Barnouin   《Preventive veterinary medicine》2009,89(3-4):265-271

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