Luteal vascular perfusion and plasma progesterone concentration are not affected by the vascularity of preovulatory follicle     

Rafael Mide RomanoJair Camargo Ferreira  Heloísa de Siqueira CanesinFernanda Saules Ignácio  Luiz Fernando Novaes FilhoCezinande de Meira 《Journal of Equine Veterinary Science》2012

  相似文献   

Commercial Breeding with Sexed Stallion Semen: Reality or Fiction?     

Juan C. Samper  Lee Morris  Fernando J. Peña  Tracy A. Plough 《Journal of Equine Veterinary Science》2012

Sorting stallion spermatozoa for the purpose of separating X- and Y-bearing spermatozoal populations has had significant advances in the past 10 years. However, current technology requires that the mare be close to the laboratory processing the semen. The development of procedures to cool and freeze sex-sorted sperm will be critical if this technology is to be embraced by the equine industry worldwide.  相似文献   

The effect of using an impedance threshold device on hemodynamic parameters during cardiopulmonary resuscitation in dogs     

Gareth J. Buckley MA  VetMB  MRCVS  DACVECC  Andre Shih DVM  DACVA  Fernando L. Garcia‐Pereira DVM  DACVA  Carsten Bandt DVM  DACVECC 《Journal of Veterinary Emergency and Critical Care》2012,22(4):435-440

  相似文献   

Biological characteristics and pathogenicity of avian Escherichia coli strains.     

Wanderley Dias da Silveira  Alessandra Ferreira  Marcelo Brocchi  Luciana Maria de Hollanda  Antonio Fernando Pestana de Castro  Aureo Tatsumi Yamada  Marcelo Lancellotti 《Veterinary microbiology》2002,85(1):47-53

Fifty avian (chicken) pathogenic Escherichia coli strains (APEC) isolated from individuals suffering from omphalitis, septicaemia and swollen head syndrome, and 30 strains isolated from healthy chickens were studied regarding their biological characteristics such as serogroups, haemolysin, colicin, cytotoxin, toxin and siderophore production, adhesion capacity to in vitro cultivated cells, and absorption of Congo red dye. Serotyping demonstrated that most of the omphalitis and normal strains were untypable, whereas most of the septicaemic strains were either untypable or rough. There was no prevalent serogroup among the pathogenic strains studied. The capacity for adhesion and invasion of in vitro cultured cells (HeLa, HEp-2, KPCC), as well as the agglutination of different types of red blood cells and the LD50 of each strain were also evaluated. No correlation was observed between the biological characteristics and pathogenicity, except that colicin was characteristically produced by swollen head syndrome E. coli strains. No correlation was found between adhesion or haemagglutination patterns and pathogenicity. Only six of the 50 strains revealed invasive capacity and the strain that best invaded the cell lines was the one with the lowest LD50.  相似文献   

Assessing foraging strategies of herbivores in Mediterranean oak woodlands: a review of key issues and selected methodologies     

Maria Isabel Ferraz de Oliveira  Elsa Lamy  Miguel N. Bugalho  Margarida Vaz  Cristina Pinheiro  Manuel Cancela d’Abreu  Fernando Capela e Silva  Elvira Sales-Baptista 《Agroforestry Systems》2013,87(6):1421-1437

Montados are agro-silvo-pastoral ecosystems, typical of the Southwest Iberian Peninsula, of high socio-economic and conservation importance, where grazing is a dominant activity. Montados are characterized by an open tree canopy of Quercus sp. and a diverse undercover of shrubs and grasslands that constitute the plant food resources for grazing animals. Plant food resources of Montados are highly variable, both spatially and seasonally, in quantity and quality. Reliable and easy to use methods to monitor grazing are necessary to allow proper understanding of foraging strategies of grazing animals and to set sustainable grazing management. We describe the main characteristics of the plant food resources available for grazing animals, striking its variability, and revise the potential of using N-alkanes and saliva proteome methods to assess foraging strategies in Montados. In a scenario of dynamic multiple choices, we discuss the use of n-alkane methodology for the simultaneous estimation of diet composition and voluntary intake and saliva proteome as a mean of increasing the knowledge on diet adjustments.  相似文献   

Evaluation of electrical nerve stimulation for epidural catheter positioning in the dog     

Fernando L Garcia‐Pereira  Robert Sanders  Andre C Shih  Ioana M Sonea  Joseph G Hauptman 《Veterinary anaesthesia and analgesia》2013,40(5):546-550

ObjectiveTo evaluate the accuracy of epidural catheter placement at different levels of the spinal cord guided solely by electrical nerve stimulation and resultant segmental muscle contraction.Study designProspective, experiment.AnimalsSix male and two female Beagles, age (1 ± 0.17 years) and weight (12.9 ± 1.1 kg).MethodsAnimals were anesthetized with propofol and maintained with isoflurane. An insulated epidural needle was used to reach the lumbosacral epidural space. A Tsui epidural catheter was inserted and connected to a nerve stimulator (1.0 mA, 0.1 ms, 2 Hz) to assess positioning of the tip at specific spinal cord segments. The catheter was advanced to three different levels of the spinal cord: lumbar (L2–L5), thoracic (T5–T10) and cervical (C4–C6). Subcutaneous needles were previously placed at these spinal levels and the catheter was advanced to match the needle location, guided only by corresponding muscle contractions. Catheter position was verified by fluoroscopy. If catheter tip and needle were at the same vertebral body a score of zero was assigned. When catheter tip was cranial or caudal to the needle, positive or negative numbers, respectively, corresponding to the number of vertebrae between them, were assigned. The mean and standard deviation of the number of vertebrae between catheter tip and needle were calculated to assess accuracy. Results are given as mean ± SD.ResultsThe catheter position in relation to the needle was within 0.3 ± 2.0 vertebral bodies. Positive predictive values (PPV) were 57%, 83% and 71% for lumbar, thoracic and cervical regions respectively. Overall PPV was 70%. No significant difference in PPV among regions was found.Conclusion and clinical relevancePlacement of an epidural catheter at specific spinal levels using electrical nerve stimulation was feasible without radiographic assistance in dogs. Two vertebral bodies difference from the target site may be clinically acceptable when performing segmental epidural regional anesthesia.  相似文献   

Performance, growth, and maturity of Nellore bulls     

Luiz Fernando Costa e Silva  Sebastião de Campos Valadares Filho  Edenio Detmann  Polyana Pizzi Rotta  Diego Zanetti  Faider Alberto Castaño Villadiego  Samantha Gusmão Pellizzoni  Rafael Moura Guimarães Pereira 《Tropical animal health and production》2013,45(3):795-803

The objectives of this study were to evaluate the dry matter intake (DMI), digestibility, average daily gain (ADG), microbial efficiency, empty body weight (EBW) gain, and body composition of Nellore bulls. Additionally, Nellore bull maturity was estimated, and the prediction equation for DMI, suggested by the Brazilian nutrient requirements system (BR CORTE; Azevêdo et al. 2010), was evaluated. Thirty-three Nellore bulls, with a mean initial weight of 259?±?25 kg and age of 14?±?1 months, were used in this study. Five animals were slaughtered at the beginning of the experiment (control group), and the remaining 28 were divided into 4 groups, each slaughtered at 42-day intervals. Their diet was composed of corn silage and concentrate (55:45). The power model was used to estimate muscle tissue, bone tissue, crude protein (CP), mineral matter (MM), and water present in the empty body, while the exponential model was used to estimate adipose tissue and ether extract (EE) present in the empty body. When expressed in kilograms per day, differences were observed (P?<?0.05) only for the intake of EE and neutral detergent fiber as a function of feedlot time periods. Although there was a difference in relation to nutrient intake, it did not affect (P?>?0.05) digestibility, with the exception of EE digestibility. The equation suggested by BR CORTE correctly estimates the DMI of Nellore bulls. ADG was not affected (P?>?0.05) by time spent in the feedlot. No differences were observed (P?>?0.05) for microbial efficiency; a mean value of 142 g microbial crude protein/kg total digestible nutrients was achieved. The muscle and bone tissues, CP, MM, and water present in the empty body increased as the animal grew, although at a lower rate. The adipose tissue and EE present in the empty body increased their deposition rate when the animal reached its mature weight. Maturity is defined as when an animal reaches 22 % EE in the empty body, which corresponds to 456 kg of EBW in Nellore bulls. Therefore, this study can conclude that the feedlot time period does not affect DMI, nutrient intake, ADG, or microbial efficiency. The equation proposed by BR CORTE (Azevêdo et al. 2010) correctly estimates the DMI of Nellore bulls, which reach maturity when an EBW of 456 kg is attained.  相似文献   

Multivariate approach for young bull selection from a performance test using multiple traits of economic importance     

Fernando Brito Lopes  Cláudio Ulhôa Magnabosco  Mariana Márcia Mamede  Marcelo Corrêa da Silva  Eliane Sayuri Myiage  Fernanda Paulini  Raysildo Barbosa Lôbo 《Tropical animal health and production》2013,45(6):1375-1381

This study used multivariate statistics to identify clusters of animals with similar expected progeny difference (EPD) and also identify leading traits that discriminate between bulls. Various linear selection indices based on specific selection criteria were proposed. Records were collected from 880 young Nelore bulls submitted to performance testing in central Brazil between 2001 and 2012. Pre-weaning average daily gain and weights at 210 days with direct and maternal effects were used in the analysis, in addition to post-weaning weight, scrotal circumference at 365 and 450 days, carcass finish and rib eye area. EPDs were classified into three groups, and the EPD means of two of these groups stood out and were considered important based on principal component analysis that associated higher values of direct EPD of weights, average daily weight gain and scrotal circumference. The EPDs for weight at 210, 365 and 450 days, pre- and post-weaning daily gain and scrotal circumference at 365 and 450 days were major causes of variation. Each linear selection index proposed (SI₁, SI₂, SI₃, SI₄ and SI₅) defined a specific approach meaning that a different selection index should be used depending on breeding goals and selection criteria.  相似文献   

Live weight, carcass ultrasound images, and visual scores in Angus cattle under feeding regimes in Brazil     

Luís Fernando Batista Pinto  Jaime Urdapilleta Tarouco  Victor Breno Pedrosa  Adriana de Farias Jucá  André Gustavo Leão  Antonia Kécya França Moita 《Tropical animal health and production》2013,45(6):1281-1287

  相似文献   

Divergence between hepatic insulin-like growth factor (IGF)-I mRNA expression and IGF-I serum levels in Leishmania (Leishmania) infantum chagasi-infected dogs     

Flaviane A. Pinho  Nilton A. Magalhães  Kleverton R. Silva  Aline A. Carvalho  Fernando L.L. Oliveira  Eduardo M. Ramos-Sanchez  Hiro Goto  Francisco A.L. Costa 《Veterinary immunology and immunopathology》2013,151(1-2):163-167

  相似文献