Linkage disequilibrium, persistence of phase and effective population size estimates in Hereford and Braford cattle.

The objective of this study was to estimate LD levels, persistence of phase and effective population size in Hereford and Braford cattle populations sampled in Brazil.Article 32

Diagnóstico do manejo do carrapato Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) no sistema de produção de pecuária familiar do Alto Camaquã.

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Estimation of linkage disequilibrium, persistence of phase and effective population size of Brazilian Hereford and Braford breeds.

A set of 41,241 SNP genotypes from 2,435 Hereford (HH) and Braford (BO) bovines were analyzed to estimate linkage disequilibrium (LD) levels, persistence of phase and effective population size of these populations. LD levels were estimated using the squared correlation of alleles at two loci (r2) at varying distances. Average r2 between adjacent SNP was 0.21 for HH and 0.16 for BO. Average inter-marker distance was 61 kb in both breeds. Useful LD values (r2>0.2) were observed at 0-60 kb bins in HH and 0-20 kb bins in BO. Breeds demonstrated moderate to strong persistence of phase at all distances (range=0.53- 0.97). The greatest phase correlations (r>0.9) were found in 0-50 kb bins. LD estimates decreased rapidly with increasing distances between SNPs, however, useful LD was observed in genomic regions spanning up to ~50 kb

Blunt traumatic aortic injuries of the ascending aorta and aortic arch: a clinical multicentre study

[Abstract] Objective. To report the clinical and radiological characteristics, management and outcomes of traumatic ascending aorta and aortic arch injuries. Methods. Historic cohort multicentre study including 17 major trauma patients with traumatic aortic injury from January 2000 to January 2011. Results. The most common mechanism of blunt trauma was motor-vehicle crash (47%) followed by motorcycle crash (41%). Patients sustaining traumatic ascending aorta or aortic arch injuries presented a high proportion of myocardial contusion (41%); moderate or greater aortic valve regurgitation (12%); haemopericardium (35%); severe head injuries (65%) and spinal cord injury (23%). The 58.8% of the patients presented a high degree aortic injury (types III and IV). Expected in-hospital mortality was over 50% as defined by mean TRISS 59.7 (SD 38.6) and mean ISS 48.2 (SD 21.6) on admission. Observed in-hospital mortality was 53%. The cause of death was directly related to the ATAI in 45% of cases, head and abdominal injuries being the cause of death in the remaining 55% cases. Long-term survival was 46% at 1 year, 39% at 5 years, and 19% at 10 years. Conclusions. Traumatic aortic injuries of the ascending aorta/arch should be considered in any major thoracic trauma patient presenting cardiac tamponade, aortic valve regurgitation and/or myocardial contusion. These aortic injuries are also associated with a high incidence of neurological injuries, which can be just as lethal as the aortic injury, so treatment priorities should be modulated on an individual basis

Economic value for the trait tick count in Brangus cattle.

Profitability of a beef cattle system may be significantly reduced by the effects of tick (Rhipicephalus (Boophilus) microplus).IMAS. Pôster 45209

Differences in biochemical, gas exchange and hydraulic response to water stress in desiccation tolerant and sensitive fronds of the fern Anemia caffrorum

Desiccation tolerant plants can survive extreme water loss in their vegetative tissues. The fern Anemia caffrorum produces desiccation tolerant (DT) fronds in the dry season and desiccation sensitive (DS) fronds in the wet season, providing a unique opportunity to explore the physiological mechanisms associated with desiccation tolerance. Anemia caffrorum plants with either DT or DS fronds were acclimated in growth chambers. Photosynthesis, frond structure and anatomy, water relations and minimum conductance to water vapour were measured under well-watered conditions. Photosynthesis, hydraulics, frond pigments, antioxidants and abscisic acid contents were monitored under water deficit. A comparison between DT and DS fronds under well-watered conditions showed that the former presented higher leaf mass per area, minimum conductance, tissue elasticity and lower CO2 assimilation. Water deficit resulted in a similar induction of abscisic acid in both frond types, but DT fronds maintained higher stomatal conductance and upregulated more prominently lipophilic antioxidants. The seasonal alternation in production of DT and DS fronds in A. caffrorum represents a mechanism by which carbon gain can be maximized during the rainy season, and a greater investment in protective mechanisms occurs during the hot dry season, enabling the exploitation of episodic water availability.This work was supported by the projects CTM2014-53902-C2-1-P from the Ministerio de Economia y Competitividad (MINECO, Spain) and the European Regional Development Fund (ERDF) and PGC2018-093824-B-C41/PGC2018-093824-B-C44 from the Ministerio de Ciencia, Innovacion y Universidades (MCIU, Spain) and the ERDF; and the Basque Government (grant UPV/EHU IT-1018-16, Spain). MN was supported by the MINECO and the European Social Fund (predoctoral fellowship BES-2015-072578). AVP-C was supported by the Ministerio de Educacion, Cultura y Deporte (MECD; pre-doctoral fellowship FPU-02054). MIA was supported by a pre-doctoral grant from the Basque Government. We thank the technical support for microscopy preparation provided by the Universitat de Valencia (Seccio de Microscopia Electrnica, SCSIE), Dr. Ferran Hierro (UIB, Serveis Cientificotecnics) and Margalida Roig Oliver (UIB). JMF provided funding for work conducted in South Africa from her South African Department of Science and Innovation, National Research Foundation Research Chair, grant no. 9840

Comparação da resposta humoral de bovinos da raça Braford resistentes e sensíveis ao Rhipicephalus (Boophilus) microplus submetidos a infestações artificiais.

Rhipicephalus microplus é responsável por perdas econômicas em rebanhos bovinos, traduzidas, especialmente, em redução na produção e investimentos no controle.Claudia Cristina Gulias Gomes, editora técnica

Tag-SNP selection using Bayesian genome-wide association study for growth and adaptation traits in Hereford and Braford cattle.

The aim of this study was to perform a Bayesian genome-wide association study (GWAS) to identify genomic regions associated with growth and adaptation traits in Hereford and Braford cattle, and to select Tag-SNPs to represent these regions in low-density panels useful for genomic predictions.Digital Archive