UNIVERSITY AND EDUCATIONAL NEWS     

Reagan AB 《Science (New York, N.Y.)》1911,34(870):271-272

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A high-resolution record of holocene climate change in speleothem calcite from cold water cave, northeast iowa   总被引：2，自引：0，他引：2  

Dorale JA  González LA  Reagan MK  Pickett DA  Murrell MT  Baker RG 《Science (New York, N.Y.)》1992,258(5088):1626-1630

High-precision uranium-thorium mass spectrometric chronology and (18)O-(13)C isotopic analysis of speleothem calcite from Cold Water Cave in northeast Iowa have been used to chart mid-Holocene climate change. Significant shifts in dagger(18)O and dagger(13)C isotopic values coincide with well-documented Holocene vegetation changes. Temperature estimates based on (18)O/(16)O ratios suggest that the climate warmed rapidly by about 3 degrees C at 5900 years before present and then cooled by 4 degrees C at 3600 years before present. Initiation of a gradual increase in dagger(13)C at 5900 years before present suggests that turnover of the forest soil biomass was slow and that equilibrium with prairie vegetation was not attained by 3600 years before present.  相似文献   

BOOK REVIEW     

WJ Pryor 《Australian veterinary journal》1991,68(6):219-219

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An evaluation of tenderness of the longissimus muscle of Angus by Hereford versus Brahman crossbred heifers   总被引：2，自引：0，他引：2  

S D Shackelford  M Koohmaraie  M F Miller  J D Crouse  J O Reagan 《Journal of animal science》1991,69(1):171-177

Postmortem aging of carcasses obtained from Angus-Hereford (n = 8) and 5/8 Brahman crossbred (n = 8) heifers was investigated to determine the cause of variation in meat tenderness. Raw longissimus muscle (LM) myofibril fragmentation index was lower and cooked LM Warner-Bratzler shear force was greater for the 5/8 Brahman crossbreds (P less than .05). The activities of calcium-dependent protease (CDP) -I and -II were not affected (P greater than .05) by breed; however, CDP inhibitor activity was higher (P less than .05) in the 5/8 Brahman carcasses. The activities of cathepsins B and B + L were not affected by breed or postmortem storage time (0, 1, 3, 7 or 14 d). Hereford-Angus carcasses were fatter opposite the 12th rib and had higher USDA yield grades and marbling scores (P less than .05). Hereford-Angus crossbreds had less dark, coarse band formation around the exterior of the LM and lighter, finer-textured lean (P less than .05). Cooking loss (%) and cooking rate (g/min) were not affected by breed or postmortem aging (P greater than .05). The increased toughness in the 5/8 Brahman carcasses may be due to increased CDP inhibitor activity.  相似文献   

Injectable abamectin causes a delay in scarabaeine dung beetle egg-laying in cattle dung     

B. HOULDING  TJ RIDSDILL-SMITH  WJ BAILEY 《Australian veterinary journal》1991,68(5):185-186

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The prediction of percentage of protein in pork carcasses     

L P Johnson  J O Reagan  K D Haydon  M F Miller 《Journal of animal science》1990,68(12):4176-4184

Determination of percentage of protein in a pork carcass is a very costly and lengthy process. Therefore, we attempted to identify an easy and economical means to predict protein content of pork carcasses. Forty-seven market-weight pigs were slaughtered. The right side of each carcass was skinned, deboned and ground for composition analysis. Carcass data were collected on the left side and specific gravity analysis was performed on the side, ham and 8-9-10 rib loin section of each carcass. The hams and loin sections were dissected into skin, bone, subcutaneous fat, seam fat and individual muscles. After these components were weighted, they were analyzed for chemical composition. Percentage of chemical protein of each animal was determined and correlated with each of the weights and measurements taken on the carcass, ham and loin sections. Stepwise regression was used to predict decimal fraction of protein using either the carcass data, specific gravity ham measurements, loin section measurements or various combinations of these. In prediction equation, specific gravity of the carcass accounted for 73.4% of the variation found in percentage of protein. Prediction equations using indicators from the ham and loin section resulted in equations with R-square values as high as .783. These results suggest that specific gravity or indicators from the carcass, ham or loin section can be employed to predict percentage of protein in pork carcasses.  相似文献   

A lupinosis-associated myopathy in sheep and the effectiveness of treatments to prevent it     

JG ALLEN  P. STEELE  HG MASTERS  WJ LAMBE 《Australian veterinary journal》1992,69(4):75-81

A lupinosis-associated myopathy occurred in 26 of 48 sheep given a crude toxic extract of Phomopsis leptostromiformis, and in 18 of 34 sheep that grazed a toxic lupin stubble. Treatment with selenium or alpha-tocopherol alone neither prevented nor cured the myopathy, but selenium and alpha-tocopherol together may have been partially effective. Among the group of 48 intoxicated sheep, those with myopathy had a significantly lower mean terminal concentration of alpha-tocopherol in their livers than those with no myopathy. There was no relationship between the severity of liver injury and the occurrence of the myopathy. It was considered that this lupinosis-associated myopathy may have a similar pathogenesis to nutritional myopathy. Data on plasma creatine phosphokinase and erythrocyte glutathione peroxidase activities, plasma alpha-tocopherol concentrations and terminal tissue concentrations of selenium and alpha-tocopherol are presented.  相似文献   

The American Society for Veterinary Clinical Pathology Regulatory Affairs Committee's clinical pathology best practices recommendations will impact the discipline of veterinary toxicologic clinical pathology     

William J. Reagan 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2013,42(3):247-249

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The effect of an intraoperative infusion of amino acids on body temperature,serum biochemistry,serum insulin,and recovery parameters in healthy dogs undergoing ovariohysterectomy     

S. Clark-Price  H. Phillips  L. Selmic  S. Keating  J. Reagan 《Veterinary anaesthesia and analgesia》2017,44(5):1262.e1-1262.e2

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Farm management factors associated with bulk tank somatic cell count in Irish dairy herds     

PT Kelly  K O'Sullivan  DP Berry  SJ More  WJ Meaney  EJ O'Callaghan  B O'Brien 《Irish veterinary journal》2009,62(Z4):S45

The relationship between bulk tank somatic cell count (SCC) and farm management and infrastructure was examined using data from 398 randomly selected, yet representative, Irish dairy farms where the basal diet is grazed grass. Median bulk tank SCC for the farms was 282,887 cells/ml ranging from 82,209 to 773,028 cells/ml. Two questionnaires were administered through face-to-face contact with each farmer. Herd-level factors associated with bulk tank SCC were determined using linear models with annual somatic cell score (i.e., arithmetic mean of the natural logarithm of bulk tank SCC) included as the dependent variable. All herd level factors were analysed individually in separate regression models, which included an adjustment for geographical location of the farm; a multiple regression model was subsequently developed. Management practices associated with low SCC included the use of dry cow therapy, participation in a milk recording scheme and the use of teat disinfection post-milking. There was an association between low SCC and an increased level of hygiene and frequency of cleaning of the holding yard, passageways and cubicles. Herd management factors associated with bulk tank SCC in Irish grazing herds are generally in agreement with most previous studies from confinement systems of milk production.  相似文献