Survival and dispersal of a defined cohort of Irish cattle     

Ashe S  More S  O'Keeffe J  White P  McGrath G  Aznar I 《Irish veterinary journal》2009,62(1):44-49

An understanding of livestock movement is critical to effective disease prevention, control and prediction. However, livestock movement in Ireland has not yet been quantified. This study has sought to define the survival and dispersal of a defined cohort of cattle born in Co. Kerry during 2000. The cohort was observed for a maximum of four years, from January 1, 2000 to December 31, 2004. Beef and dairy animals moved an average 1.31 and 0.83 times, respectively. At study end, 18.8% of the beef animals remained alive on Irish farms, including 6.7% at the farm-of-birth, compared with 48.6% and 27.7% for dairy animals respectively. Beef animals werae dispersed to all Irish counties, but mainly to Cork, Limerick, Tipperary and Galway. Dairy animals mainly moved to Cork, Limerick, and Tipperary, with less animals going to Galway, Meath and Kilkenny. The four-year survival probability was 0.07 (male beef animals), 0.25 (male dairy), 0.38 (female beef), and 0.72 (female dairy). Although there was considerable dispersal, the number of moves per animal was less than expected.  相似文献   

Farm management factors associated with bulk tank total bacterial count in Irish dairy herds during 2006/07     

Kelly P  O'Sullivan K  Berry D  More S  Meaney W  O'Callaghan E  O'Brien B 《Irish veterinary journal》2009,62(1):36-42

Research has shown that total bacterial count (TBC), which is the bacterial growth per ml of milk over a fixed period of time, can be decreased by good hygiene and farm management practices. The objective of the current study was to quantify the associations between herd management factors and bulk tank TBC in Irish spring calving, grass-based dairy herds. The relationship between bulk tank TBC and farm management and infrastructure was examined using data from 400 randomly selected Irish dairy farms where the basal diet was grazed grass. Herd management factors associated with bulk tank TBC were identified using linear models with herd annual total bacterial score (i.e., arithmetic mean of the natural logarithm of bulk tank TBC) included as the dependent variable. All herd management factors were individually analysed in a separate regression model, that included an adjustment for geographical location of the farm. A multiple stepwise regression model was subsequently developed. Median bulk tank TBC for the sample herds was 18,483 cells/ml ranging from 10,441 to 130,458 cells/ml. Results from the multivariate analysis indicated that the following management practices were associated with low TBC; use of heated water in the milking parlour; participation in a milk recording scheme; and tail clipping of cows at a frequency greater than once per year. Increased level of hygiene of the parlour and cubicles were also associated with lower TBC. Herd management factors associated with bulk tank TBC in Irish grazing herds were generally in agreement with most previous studies from confinement systems of milk production.  相似文献   

Evaluation of ‘Section‐Ligation‐Release (SLR)’ Technique Devised for Castration in the Stallion     

S Saifzadeh  R Hobbenaghi  S Asri‐Rezaei  F Shokouhi SJ  B Dalir‐Naghadeh  M Rohi S 《Reproduction in domestic animals》2008,43(6):678-684

A novel technique [Section‐Ligation‐Release (SLR)] was evaluated for castration in the horse. Clinical traits, serum testosterone concentrations after challenge with human chorionic gonadotrophin (hCG), and histopathological changes of the testicular tissue were assessed. Five stallions, aged 24–48 months, were castrated using SLR technique under general anaesthesia. Both spermatic cords in each stallion were exposed at the scrotal neck by two 5‐cm long incisions, followed by sharp dissection through the parietal vaginal tunic. Both vascular and non‐vascular structures in the cords were triple clamped, transected and ligated. Both testes were left in situ. Serum testosterone concentrations were measured pre‐operatively and at 2 months after castration following IV administration of 1 × 10⁴ IU of hCG. Both testes from each castrate were collected at 2 months for histopathologic examination. SLR castration was successfully achieved. Moderated scrotal and preputial swelling was the only experienced short‐term complication. Serum testosterone concentrations were significantly lower than basal pre‐operative levels at 2 months after castration, and did not respond to hCG. On histopathology, hyalinization of the seminiferous tubules and loss of testicular interstitial tissue were indicative of complete avascular necrosis. This novel primary closure castration technique of stallion is a simple practical method, with minimal post‐operative complications; and could be safely advocated as an alternative to the traditional castration techniques allowing for second intention healing of scrotal wounds.  相似文献   

Paleontology and Chronology of Two Evolutionary Transitions by Hybridization in the Bahamian Land Snail Cerion     

GA Goodfriend  SJ Gould 《Science (New York, N.Y.)》1996,274(5294):1894-1897

The late Quaternary fossil record of the Bahamian land snail Cerion on Great Inagua documents two transitions apparently resulting from hybridization. In the first, a localized modern population represents the hybrid descendants of a 13,000-year-old fossil form from the same area, introgressed with the modern form now characteristic of the adjacent regions. In the second case, a chronocline spanning 15,000 to 20,000 years and expressing the transition of an extinct fossil form to the modern form found on the south coast was documented by morphometry of fossils dated by amino acid racemization and radiocarbon. Hybrid intermediates persisted for many thousands of years.  相似文献   

Volatiles from the 1994 Eruptions of Rabaul: Understanding Large Caldera Systems     

K Roggensack  SN Williams  SJ Schaefer  RA Parnell 《Science (New York, N.Y.)》1996,273(5274):490-493

The 1994 eruption of Rabaul, in Papua New Guinea, involved a small plinian eruption at Vulcan and a vulcanian eruption on the opposite side of the caldera at Tavurvur. Vulcan's ash leachates indicate seawater interaction that is consistent with earlier observations of low sulfur dioxide emissions and the presence of ice crystals in the initial plinian eruption cloud. In contrast, Tavurvur ash leachates indicate no seawater interaction, and later sulfur dioxide emissions remained high despite low-level eruptive activity. Silicic melt inclusions indicate that the andesitic melt contained about 2 weight percent water and negligible carbon dioxide. Mafic melt inclusions in Tavurvur ash have water and carbon dioxide contents that vary systematically over the course of the eruption. The mafic melt inclusions suggest that a mafic dike intruded from below the silicic chamber and provide further evidence that mafic intrusions drive caldera unrest.  相似文献   

Radar detection of the nucleus and coma of comet hyakutake     

JK Harmon  SJ Ostro  LAM Benner  KD Rosema  RF Jurgens  R Winkler  DK Yeomans  D Choate  R Cormier  JD Giorgini  DL Mitchell  PW Chodas  R Rose  D Kelley  MA Slade  ML Thomas 《Science (New York, N.Y.)》1997,278(5345):1921-1924

Radar observations of comet Hyakutake (C/1996 B2) made at the Goldstone Deep Space Communications Complex in California have detected echoes from the nucleus and from large grains in the inner coma. The nucleus of this bright comet was estimated to be only 2 to 3 kilometers in diameter. Models of the coma echo indicate backscatter from porous, centimeter-size grains ejected anisotropically at velocities of tens of meters per second. The radar observations suggest that a comet's activity may be a poor indicator of its size and provide evidence that large grains constitute an important component of the mass loss from a typical active comet.  相似文献   

Long-term radiographic appearance of a bioabsorbable biocomposite tibial tuberosity advancement cage implant     

CL Ferrell  MD Barnhart  AT Watson  ML Barron-Chapman  SJ Naber 《Australian veterinary journal》2020,98(1-2):26-30

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Valvular endocarditis associated with Helcococcus ovis infection in a bovine.     

Karen W Post  Steven D Rushton  Stephen J Billington 《Journal of veterinary diagnostic investigation》2003,15(5):473-475

A 12-month-old Angus bull calf with a history of fever and lethargy of several weeks' duration was necropsied. Macroscopic findings included general dehydration, congestion, and edema within the craniodorsal lobes of the lung, multifocal ecchymotic hemorrhages on the dorsal epaxial and gluteal muscles, bloody ingesta within the gastrointestinal tract, and a 4- x 4- x 5-cm irregular plaque located on the right atrioventricular heart valve. Microscopically, there were focally extensive pulmonary alveolar infiltrates of histiocytes and neutrophils, large numbers of necrotic hypereosinophilic hepatocytes located within the centrilobular and midzonal regions of the liver, and, within the plaque from the right atrioventricular valve, a large mass formed by abundant laminated fibrin that contained numerous small multifocal aggregates of gram-positive cocci. This report describes the first apparent isolation of Helcococcus ovis from cattle.  相似文献   

Investigations into the toxicity of Echium plantagineum in sheep: 1. Field grazing experiments     

JT SEAMAN  WS TURVEY  SJ OTTAWAY  AR GILMOUR  RJ DIXON† 《Australian veterinary journal》1989,66(9):279-285

A field grazing trial was undertaken to monitor the health and production of crossbred sheep grazing pasture where Echium plantagineum constituted a considerable proportion of the available forage. The trial, conducted for 19 months over successive grazing seasons, demonstrated a significant difference in production, with sheep on the E. plantagineum pasture being lighter and growing less wool compared with sheep on Echium-free pasture. No mortalities involving pyrrolizidine alkaloid poisoning were recorded in sheep grazing E. plantagineum, although there was histological evidence of moderately severe liver damage associated with high liver copper concentrations in at least one sheep following the grazing of large quantities of the plant.  相似文献   

Teaching agricultural history in American universities     

Monroe Billington 《Agriculture and Human Values》1988,5(4):34-39

This paper reports the results of a survey of the teaching of courses in agricultural history in the seventy-four Land Grant institutions in the United States and its territories. It concludes with the expression of concern that the subject matter, agricultural history, is nearly a dying field, and only heroic measures will succeed in rescuing it.  相似文献