Effects of intraovarian infusion of insulin-like growth factor-I on ovarian follicular function in cattle     

Spicer LJ  Alvarez P  Prado TM  Morgan GL  Hamilton TD 《Domestic animal endocrinology》2000,18(2):265-278

The objective of this study was to determine if increased secretion of intraovarian insulin-like growth factor-I (IGF-I), experimentally induced via minipumps, affects follicular function in cattle. Fourteen cycling Holstein cows were divided equally into two groups: Control, osmotic minipumps (containing vehicle) surgically inserted into each ovary, or IGF-I treated, osmotic minipumps as in Controls but pumping 2.0 microg of recombinant human IGF-I per hr for 7 days. All cows were synchronized with prostaglandin F(2alpha) 0.10) between Control and IGF-I-treated cows during Days 2 to 6 of treatment. IGF-I treatment increased (P<0.05) estradiol concentrations in follicular fluid of small follicles, but had no effect (P<0.10) on estradiol concentrations in follicular fluid of large follicles, or on progesterone, androstenedione, or IGF binding protein concentrations in small or large follicles. We conclude that a 7-day infusion of IGF-I directly into the stroma of the ovary altered follicular growth and follicular fluid estradiol concentrations.  相似文献   

Phenotypic variability in different strains of Pseudomonas syringae subsp. savastanoi isolated from different hosts     

F. Alvarez  J.E. García de los Ríos  P. Jimenez  A. Rojas  P. Reche  M.T. Troya 《European journal of plant pathology / European Foundation for Plant Pathology》1998,104(6):603-609

One hundred and sixty strains of Pseudomonas syringae subsp. savastanoi from Olea europaea, Olea europaea var. sylvestris, Nerium oleander, Fraxinus angustifolia and Retama sphaerocarpa, and four type strains of other pathovars were studied, investigating 102 phenotypic traits, among which we include biochemical characteristics, assimilation of different carbon sources, sensitivity or resistance to antibiotics and indoleacetic acid (IAA) production. Results were analysed with an affinity dendrogram via the Jaccard coefficient. They indicate an influence of environmental factors on the formation of the 15 phenons obtained, since isolated (knot) strains from the same species but different geographical areas are segregated. Segregation, also detected in strains from different hosts within the same area, added to the pathogenicity test helps to characterise these strains as different pathovars.  相似文献   

Anatomicohistological Characteristics of Female Genital Tubular Organs of the South American Nutria (Myocastor coypus)     

A. Felipe  S. Callejas  J. Cabodevila 《Anatomia, histologia, embryologia》1998,27(4):245-250

Morphohistological features of the tubular organs of the Myocastor coypus (coypu) female reproductive tract were studied. Specimens came from breeding farms with yard breeding systems. The analysis of the organs was made by histological methods and by macro and microscopic measurement techniques. The animals showed oviducts with macro and microscopically differentiable regions. Their mucosa showed primary branched folds in the ampullar sector. In the rest of the oviduct tract these folds were only of the primary type. The double uterus showed regional variations in the lumen, endometrial glands along the whole surface and a wide fibromuscular cervix with pseudoglands. The endocervical mucosa made clear a complex system of folds covered by a mucus-secreting epithelium. In the long vagina of the coypu a folded, rugose and irregular mucosa was observed.  相似文献   

hCG is more effective than the GnRH agonist buserelin for inducing the first ovulation of the breeding season in mares     

Diana Fanelli  Matteo Tesi  Alessandra Rota  Massimiliano Beltramo  Giuseppe Conte  Mario Giorgi  Giovanni Barsotti  Francesco Camillo  Duccio Panzani 《Equine veterinary journal》2022,54(2):306-311

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Mild to moderate overweight in dogs: is there an impact on routine hematological and biochemical profiles,echocardiographic parameters and cardiac autonomic modulation?     

Vieira  Aline Bomfim  Restrepo  Mariana Alvarez  Auzenne  Danielle  Molina  Kevin  O’Sullivan  Meghan  Machado  Marcus Vinicius  Cavanaugh  Sarah Marie 《Veterinary research communications》2022,46(2):527-535

Veterinary Research Communications - Obesity is considered the most common nutritional disease of dogs. Even though overt obesity is more likely to impair health, even moderately overweight dogs...  相似文献   

The decline of Austrocedrus chilensis forests in Patagonia, Argentina: soil features as predisposing factors     

Ludmila La Manna  Mario Rajchenberg 《Forest Ecology and Management》2004,190(2-3):345-357

The forests of Austrocedrus chilensis in southern Argentina suffer mortality from “mal del ciprés”, whose causes remain unknown. The purpose of this work was to establish the relation of soil features with the occurrence of the disease. In Río Grande Valley, Chubut Province, Argentina, 14 areas with “mal del ciprés” were selected for study. The spatial pattern of the decline varied among the different areas and was classified as aggregated and disaggregated. In each area, symptomatic and asymptomatic plots were established and characterized by 11 edaphic and topographic variables. Three forest areas where the disease was totally absent were also included. Site features were related to the occurrence of the decline using principal component analysis and cluster analysis. Results indicated that soil properties related to poor internal drainage, such as the proximity to water streams, non-allophanized soils of fine textures, and redoximorphic features, act as predisposing factors to the development of “mal del ciprés”. Poor soil drainage was strongly associated not only with the occurrence of the disease, but also with its spatial pattern. Symptomatic and asymptomatic plots presented similar edaphic features in areas with a disaggregated distribution of the decline and were grouped together in the multivariate analysis. This result suggests that large areas with such a pattern are prone to develop the decline.  相似文献   

The North American long-term soil productivity experiment: Findings from the first decade of research   总被引：1，自引：0，他引：1  

Robert F. Powers  D. Andrew Scott  Felipe G. Sanchez  Richard A. Voldseth  Deborah Page-Dumroese  John D. Elioff  Douglas M. Stone 《Forest Ecology and Management》2005,220(1-3):31-50

First decade findings on the impacts of organic matter removal and soil compaction are reported for the 26 oldest installations in the nation-wide network of long-term soil productivity sites. Complete removal of surface organic matter led to declines in soil C concentration to 20 cm depth and to reduced nutrient availability. The effect is attributed mainly to the loss of the forest floor. Soil C storage seemed undiminished, but could be explained by bulk density changes following disturbance and to decomposition inputs of organic C from roots remaining from the harvested forest. Biomass removal during harvesting had no influence on forest growth through 10 years. Soil compaction effects depended upon initial bulk density. Soils with densities greater than 1.4 Mg m⁻³ resisted compaction. Density recovery was slow, particularly on soils with frigid temperature regimes. Forest productivity response to soil compaction depended both on soil texture and the degree of understory competition. Production declined on compacted clay soils, increased on sands, and generally was unaffected if an understory was absent.  相似文献   

Stand structure of an uneven-aged fir–beech forest with an irregular diameter structure: modeling the development of the Belevine forest, Croatia     

Juro Čavlović  Mario Božić  Andrej Boncina 《European Journal of Forest Research》2006,125(4):325-333

This study focuses on the problem of irregular diameter structure in a silver fir–beech selection (plenter) forest with a “surplus” of large diameter trees and a lack of natural regeneration and small diameter trees. We sampled 274 plots (900 m² each) in the Belevine research site (266.24 ha) in the mountain region Gorski Kotar (Croatia), where diameter (dbh) distribution, diameter increment, and natural regeneration were analyzed in detail. A low density of natural regeneration, weak annual recruitment of small (10 cm dbh) diameter trees (only five trees per hectare), delayed diameter growth of trees, and a low annual rate of trees reaching the next dbh class were attributed to the current irregular dbh structure. The stand development prediction for the next 50 years is based on a simulation model, which considers the current diameter structure, increment, recruitment, and future cutting regime. Intensive cutting in the first of five 10-year cutting cycles (intensity higher of 25%) is needed to initiate natural regeneration and to accelerate growth of young silver fir trees. In the next 50 years, the irregular diameter structure will be gradually improved.  相似文献   

Bursaphelenchus fungivorus (Nematoda: Aphelenchida) associated with Orthotomicus erosus (Coleoptera: Scolitydae) in Spain     

M. Arias  L. Robertson  A. Garcia‐Alvarez  S. C. Arcos  M. Escuer  R. Sanz  J. P. Mansilla 《Forest Pathology》2005,35(5):375-383

A survey of the xylophagous insects in the conifer forests, mainly Pinus pinaster woodlands, in Spain was carried out in order to study the phoretic vectors of nematodes of the genus Bursaphelenchus. Fifteen environmental sites were characterized on the bases of altitude, rainfall, temperature and conifer species. Specimens of Orthotomicus erosus (n = 3476) were captured of which 59% carried nematodes under their elytrous, most of them were aphelenchid fungal‐feeding nematodes, but B. fungivorus was found on the beetles from Las Cumbres, Villa Blanca, (Huelva), southern Spain, which represent the first record of O. erosus as vector of a Bursaphelenchus sp. The nematode is characterized by morphometric and biomolecular techniques and distribution and ecology of the insect is discussed.  相似文献   

Can the use of large,alternative nursery containers aid in field establishment of Juglans regia and Quercus robur seedlings?     

Barbara Mariotti  Alberto Maltoni  Pier Mario Chiarabaglio  Achille Giorcelli  Douglass F. Jacobs  Roberto Tognetti  Andrea Tani 《New Forests》2015,46(5-6):773-794

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