1,721,028 research outputs found
Genetic parameters for body condition score, locomotion, angularity and production traits in Italian Holstein cattle.
No full textUnofficial results of the first international genetic evaluation for body condition score in Italian Holstein Friesian cattle
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Predicting survivors of neonatal calf diarrhea using logistic regression or gradient boosting
No full textGenome wide association analysis of the 16th QTL- MAS Workshop dataset using the Random Forest machine learning approach
Full text linkGenome wide association studies are now widely used in the livestock sector to estimate the association among single nucleotide polymorphisms (SNPs) distributed across the whole genome and one or more trait. As computational power increases, the use of machine learning techniques to analyze large genome wide datasets becomes possible
Genomic approaches to left-sided displacement of the abomasum in Italian Holstein cattle : results from a comprehensive research project
No full textP546 - Genomic Approaches to Left-Sided Abomasal Displacement in Italian Holstein Cattle: Results from a Comprehensive Research Project
A sample of 64 Italian Holstein cows was analysed to investigate the genetic architecture of left-sided abomasal displacement (LDA). LDA is one of the most common disorders of the digestive system in dairy breeds, causing economic losses due to treatment costs, premature culling, and reduction of milk yield. Among predisposing factors, LDA is induced by impaired abomasal motility that causes an accumulation of gas. Moreover, previous studies have shown the existence of a genetic component, with heritabilities estimated between 0.2 and 0.5. A total of 17 cases and 47 controls were available from 5 commercial herds. All cows were genotyped with the Illumina 50k bovine SNP chip. Two methods of analysis were used: a genome-wide association study (GWAS) of cases and controls and the analysis of runs of homozygosity (autozygosity-by-difference). In total, 39 SNPs located on 19 bovine (Bos taurus) chromosomes (BTA) showed associations with LDA (−log10 P-values >3.0). Two of these SNP, located on BTA13 and BTA12, showed genome-wide significant associations with LDA at −log10 P-values > 4. SNP on BTA12 is located in the region of SLITRK5 gene, a member of the SLITRK family. SLITRK genes are expressed predominantly in neural tissues with a neurite-modulating activity. On chromosome 14, a common stretch of homozygosity in cases and controls was detected, in the region close to the DGAT1 mutation
Genetic parameters for milk yield and persistency in Carora dairy cattle breed using random regression model
Full text linkIn tropical environments, lactation curves with lower peaks and higher persistency (PS) might be desirable from both an economical and a physiological point of view. The objective of this study was to obtain genetic parameters for test day (TD) yields, and PS for the tropical breed Carora and to compare these with results from a standard 305-d-milk yield animal model. Four random regression models (RRM) were used on a dataset composed of 95,606 TD records collected in Venezuela and tested to find the best fitting the data. Estimated daily heritabilities for milk yields ranged from 0.21 to 0.30, with the lowest values around the peak of lactation. Lactation repeatabilities ranged from 0.50 to 0.56. Correlations between the breeding values obtained with the RRM and the lactation model currently used in Venezuela [single trait Animal Model (stAM)] are quite high and positive (Pearson correlation=0.71 and Spearman correlation=0.72). Correlations between PS and 305-d-milk yield estimated breeding values (EBV) ranged from -0.18 (PS as the deviation of daily productions in the interval 50-279 days in milk from a point at the end of lactation) to 0.52 (PS as EBV difference between the second and the first stage of lactation). The use of PS indexes accounting for milk yield may allow the selection of individuals able to express their potential genetic values in tropical environment, without incurring in excessive heat stress losses
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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