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  1. AU="Arango, Jesus"
  2. AU="Scott, C. Tim"
  3. AU="Coelho, Luis Francisco Mello(Universidade Estadual Paulista Instituto de Biociências Departamento de Botânica)"
  4. AU="Hesong Zeng"
  5. AU="Babey, Anna-Marie"
  6. AU="Stich, H"
  7. AU=Kuitunen I
  8. AU="Biscaye Pierre E"
  9. AU="Saha, Somen"
  10. AU="Liu, Weihuang"
  11. AU="Nijhuis, Monique"
  12. AU="Ye, Jin-Rong"
  13. AU="Van Not, Hans Pieter"
  14. AU="Liang, Xiao-Hui"
  15. AU="Romano, Raffaella"
  16. AU="Gilles Subra"
  17. AU="Potocnik, Ana"
  18. AU="Butt, Christine"

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  1. Buch ; Online: On an uncertainty principle for small index subgroups of finite fields

    Padilla, Diego Fernando Díaz / Arango, Jesús Alonso Ochoa

    2023  

    Abstract: In this paper we continue the study of the the nonvanishing minors property (NVM) initiated in [7] by Garcia, Karaali and Katz, for the compressed Fourier matrix attached to a subgroup $H$ of the multiplicative group of a finite field $\mathbb{F}_q$ and ... ...

    Abstract In this paper we continue the study of the the nonvanishing minors property (NVM) initiated in [7] by Garcia, Karaali and Katz, for the compressed Fourier matrix attached to a subgroup $H$ of the multiplicative group of a finite field $\mathbb{F}_q$ and a character $\chi$ defined over $H$. Here we provide a characterization of this aforementioned property for \textit{symmetries} arising from an index-3 subgroup $H$ and nontrivial character $\chi$.

    Comment: 8 pages, Comments wellcome
    Schlagwörter Mathematics - Number Theory ; Computer Science - Information Theory ; Mathematics - Commutative Algebra ; Mathematics - Group Theory
    Erscheinungsdatum 2023-10-15
    Erscheinungsland us
    Dokumenttyp Buch ; Online
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  2. Artikel ; Online: Genome wide association analysis of cuticle deposition in laying hens.

    Wang, Zhang / Dunn, Ian C / Wilson, Peter W / Pertinez, Sandra Poyatos / Fulton, Janet E / Arango, Jesus / Andersson, Björn / Schmutz, Matthias / Wolc, Anna

    Poultry science

    2023  Band 102, Heft 10, Seite(n) 102990

    Abstract: The cuticle is an invisible barrier that protects the internal egg contents from microorganisms entering through gas exchange pores. Eggs which have a good cuticle are least likely to be penetrated by microorganisms and improved cuticle cover should ... ...

    Abstract The cuticle is an invisible barrier that protects the internal egg contents from microorganisms entering through gas exchange pores. Eggs which have a good cuticle are least likely to be penetrated by microorganisms and improved cuticle cover should reduce vertical transmission of microorganisms and improve biosecurity. The aim was to carry out a genome wide association study for cuticle deposition in 3 independent populations of laying hens using tartrazine and lissamine green staining. Eggs from ∼8,000 hens represented 2 White Leghorn and 1 Rhode Island Red breed. Estimates of heritability using pedigree or genomic relationship matrices were in the 0.2 to 0.3 range. The results were breed specific. Across the populations, genomic regions on chromosomes 1, 2, 4, 5, and 8 were identified as significantly associated with cuticle deposition. No single loci had a large effect. A comparison was made with genes differentially expressed in the shell gland when cuticle deposition was manipulated, however none were obvious candidates for cuticle deposition. The results support the polygenic nature of the trait and the information will help in the future to understand the genetic variance and what might control cuticle deposition and the microbiological safety of the egg.
    Mesh-Begriff(e) Animals ; Female ; Genome-Wide Association Study/veterinary ; Chickens/genetics ; Chickens/microbiology ; Ovum ; Genome ; Phenotype ; Egg Shell/microbiology ; Eggs
    Sprache Englisch
    Erscheinungsdatum 2023-08-08
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 242586-5
    ISSN 1525-3171 ; 0032-5791
    ISSN (online) 1525-3171
    ISSN 0032-5791
    DOI 10.1016/j.psj.2023.102990
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  3. Artikel: Genome‐wide association studies for egg quality traits in White Leghorn layers using low‐pass sequencing and SNP chip data

    Li, Jinghui / Wang, Zigui / Lubritz, Danny / Arango, Jesus / Fulton, Janet / Settar, Petek / Rowland, Kaylee / Cheng, Hao / Wolc, Anna

    Journal of animal breeding and genetics. 2022 July, v. 139, no. 4

    2022  

    Abstract: Low‐pass sequencing data have been proposed as an alternative to single nucleotide polymorphism (SNP) chips in genome‐wide association studies (GWAS) of several species. However, it has not been used in layer chickens yet. This study aims at comparing ... ...

    Abstract Low‐pass sequencing data have been proposed as an alternative to single nucleotide polymorphism (SNP) chips in genome‐wide association studies (GWAS) of several species. However, it has not been used in layer chickens yet. This study aims at comparing the GWAS results of White Leghorn chickens using low‐pass sequencing data (1×) and 54 k SNP chip data. Ten commercially relevant egg quality traits including albumen height, shell strength, shell colour, egg weight and yolk weight collected from up to 1,420 White Leghorn chickens were analysed. The results showed that the genomic heritability estimates based on low‐pass sequencing data were higher than those based on SNP chip data. Although two GWAS analyses showed similar overall landscape for most traits, low‐pass sequencing captured some significant SNPs that were not on the SNP chip. In GWAS analysis using 54 k SNP chip data, after including more individuals (up to 5,700), additional significant SNPs not detected by low‐pass sequencing data were found. In conclusion, GWAS using low‐pass sequencing data showed similar results to those with SNP chip data and may require much larger sample sizes to show measurable advantages.
    Schlagwörter White Leghorn ; color ; egg weight ; genomics ; heritability ; landscapes ; single nucleotide polymorphism
    Sprache Englisch
    Erscheinungsverlauf 2022-07
    Umfang p. 380-397.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 631363-2
    ISSN 0931-2668
    ISSN 0931-2668
    DOI 10.1111/jbg.12679
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  4. Artikel ; Online: A biphasic curve for modeling, classifying, and predicting egg production in single cycle and molted flocks.

    Wolc, Anna / Arango, Jesus / Rubinoff, Ian / Dekkers, Jack C M

    Poultry science

    2020  Band 99, Heft 4, Seite(n) 2007–2010

    Abstract: Egg production on a flock level can be summarized into several phases determined by biology of individual birds: rapid increase in production reflecting achieving sexual maturity, peak production related to maximum laying potential, followed by gradual ... ...

    Abstract Egg production on a flock level can be summarized into several phases determined by biology of individual birds: rapid increase in production reflecting achieving sexual maturity, peak production related to maximum laying potential, followed by gradual decrease in the rate of lay as the birds age. In 1989 Yang et al. proposed a mathematical model (modified compartmental model) to describe this process. In this study a biphasic modified compartmental model was proposed for modeling, classifying, and predicting egg production in single cycle and molted flocks. Goodness-of-fit was high for both single cycle (average R
    Mesh-Begriff(e) Animal Husbandry/methods ; Animals ; Chickens/physiology ; Female ; Models, Biological ; Molting ; Ovum/physiology ; Reproduction
    Sprache Englisch
    Erscheinungsdatum 2020-02-07
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 242586-5
    ISSN 1525-3171 ; 0032-5791
    ISSN (online) 1525-3171
    ISSN 0032-5791
    DOI 10.1016/j.psj.2019.11.037
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  5. Artikel: A biphasic curve for modeling, classifying, and predicting egg production in single cycle and molted flocks

    Wolc, Anna / Arango, Jesus / Rubinoff, Ian / Dekkers, Jack C.M

    Poultry science. 2020 Apr., v. 99, no. 4

    2020  

    Abstract: Egg production on a flock level can be summarized into several phases determined by biology of individual birds: rapid increase in production reflecting achieving sexual maturity, peak production related to maximum laying potential, followed by gradual ... ...

    Abstract Egg production on a flock level can be summarized into several phases determined by biology of individual birds: rapid increase in production reflecting achieving sexual maturity, peak production related to maximum laying potential, followed by gradual decrease in the rate of lay as the birds age. In 1989 Yang et al. proposed a mathematical model (modified compartmental model) to describe this process. In this study a biphasic modified compartmental model was proposed for modeling, classifying, and predicting egg production in single cycle and molted flocks. Goodness-of-fit was high for both single cycle (average R² = 0.99) and molted flocks (average R² = 0.97), suggesting that the model could be used for benchmarking molted flocks. The difference in R² between the biphasic model and the model used by Yang et al in 1989 can be used to differentiate between single cycle and molted flocks. The biphasic model was shown to predict future records well up to 8 wk in advance, but as with any regression model, caution is recommended when predicting records outside of the observed age range.
    Schlagwörter birds ; egg production ; flocks ; mathematical models ; prediction ; regression analysis ; sexual maturity
    Sprache Englisch
    Erscheinungsverlauf 2020-04
    Umfang p. 2007-2010.
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    ZDB-ID 242586-5
    ISSN 1525-3171 ; 0032-5791
    ISSN (online) 1525-3171
    ISSN 0032-5791
    DOI 10.1016/j.psj.2019.11.037
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  6. Artikel: Heritability of perching behavior and its genetic relationship with incidence of floor eggs in Rhode Island Red chickens

    Wolc, Anna / Settar, Petek / Fulton, Janet E / Arango, Jesus / Rowland, Kaylee / Lubritz, Danny / Dekkers, Jack C. M

    Genetics, selection, evolution. 2021 Dec., v. 53, no. 1

    2021  

    Abstract: BACKGROUND: As cage-free production systems become increasingly popular, behavioral traits such as nesting behavior and temperament have become more important. The objective of this study was to estimate heritabilities for frequency of perching and ... ...

    Abstract BACKGROUND: As cage-free production systems become increasingly popular, behavioral traits such as nesting behavior and temperament have become more important. The objective of this study was to estimate heritabilities for frequency of perching and proportion of floor eggs and their genetic correlation in two Rhode Island Red lines. RESULTS: The percent of hens observed perching tended to increase and the proportion of eggs laid on the floor tended to decrease as the test progressed. This suggests the ability of hens to learn to use nests and perches. Under the bivariate repeatability model, estimates of heritability in the two lines were 0.22 ± 0.04 and 0.07 ± 0.05 for the percent of hens perching, and 0.52 ± 0.05 and 0.45 ± 0.05 for the percent of floor eggs. Estimates of the genetic correlation between perching and floor eggs were − 0.26 ± 0.14 and − 0.19 ± 0.27 for the two lines, suggesting that, genetically, there was some tendency for hens that better use perches to also use nests; but the phenotypic correlation was close to zero. Random regression models indicated the presence of a genetic component for learning ability. CONCLUSIONS: In conclusion, perching and tendency to lay floor eggs were shown to be a learned behavior, which stresses the importance of proper management and training of pullets and young hens. A significant genetic component was found, confirming the possibility to improve nesting behavior for cage-free systems through genetic selection.
    Schlagwörter Rhode Island Red ; genetic correlation ; genetic relationships ; genetic selection ; heritability ; models ; phenotypic correlation ; temperament
    Sprache Englisch
    Erscheinungsverlauf 2021-12
    Umfang p. 38.
    Erscheinungsort BioMed Central
    Dokumenttyp Artikel
    ZDB-ID 1005838-2
    ISSN 1297-9686 ; 0754-0264 ; 0999-193X
    ISSN (online) 1297-9686
    ISSN 0754-0264 ; 0999-193X
    DOI 10.1186/s12711-021-00630-5
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  7. Artikel: The impact of endogenous Avian Leukosis Viruses (ALVE) on production traits in elite layer lines

    Fulton, Janet E / Mason, Andrew S / Wolc, Anna / Arango, Jesus / Settar, Petek / Lund, Ashlee R / Burt, David W

    Poultry science. 2021 June, v. 100, no. 6

    2021  

    Abstract: Avian Leukosis Virus subgroup E (ALVE) integrations are endogenous retroviral elements found in the chicken genome. The presence of ALVE has been reported to have negative impacts on multiple traits, including egg production and body weight. The recent ... ...

    Abstract Avian Leukosis Virus subgroup E (ALVE) integrations are endogenous retroviral elements found in the chicken genome. The presence of ALVE has been reported to have negative impacts on multiple traits, including egg production and body weight. The recent development of rapid, inexpensive and specific ALVE detection methods has facilitated their characterization in elite commercial egg production lines across multiple generations. The presence of 20 ALVE was examined in 8 elite lines, from 3 different breeds. Seventeen of these ALVE (85%) were informative and found to be segregating in at least one of the lines. To test for an association between specific ALVE inserts and traits, a large genotype by phenotype study was undertaken. Genotypes were obtained for 500 to 1500 males per line, and the phenotypes used were sire-daughter averages. Phenotype data were analyzed by line with a linear model that included the effects of generation, ALVE genotype and their interaction. If genotype effect was significant, the number of ALVE copies was fitted as a regression to estimate additive ALVE gene substitution effect. Significant associations between the presence of specific ALVE inserts and 18 commercially relevant performance and egg quality traits, including egg production, egg weight and albumen height, were observed. When an ALVE was segregating in more than one line, these associations did not always have the same impact (negative, positive or none) in each line. It is hypothesized that the presence of ALVE in the chicken genome may influence production traits by 3 mechanisms: viral protein production may modulate the immune system and impact overall production performance (virus effect); insertional mutagenesis caused by viral integration may cause direct gene alterations or affect gene regulation (gene effect); or the integration site may be within or adjacent to a quantitative trait region which impacts a performance trait (linkage disequilibrium, marker effect).
    Schlagwörter Avian leukosis virus ; avian leukosis ; body weight ; chickens ; egg production ; egg weight ; genes ; genotype ; immune system ; insertional mutagenesis ; linear models ; linkage disequilibrium ; phenotype ; protein synthesis ; quantitative traits ; viruses
    Sprache Englisch
    Erscheinungsverlauf 2021-06
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    ZDB-ID 242586-5
    ISSN 1525-3171 ; 0032-5791
    ISSN (online) 1525-3171
    ISSN 0032-5791
    DOI 10.1016/j.psj.2021.101121
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  8. Artikel ; Online: Genome-wide association studies for egg quality traits in White Leghorn layers using low-pass sequencing and SNP chip data.

    Li, Jinghui / Wang, Zigui / Lubritz, Danny / Arango, Jesus / Fulton, Janet / Settar, Petek / Rowland, Kaylee / Cheng, Hao / Wolc, Anna

    Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie

    2022  Band 139, Heft 4, Seite(n) 380–397

    Abstract: Low-pass sequencing data have been proposed as an alternative to single nucleotide polymorphism (SNP) chips in genome-wide association studies (GWAS) of several species. However, it has not been used in layer chickens yet. This study aims at comparing ... ...

    Abstract Low-pass sequencing data have been proposed as an alternative to single nucleotide polymorphism (SNP) chips in genome-wide association studies (GWAS) of several species. However, it has not been used in layer chickens yet. This study aims at comparing the GWAS results of White Leghorn chickens using low-pass sequencing data (1×) and 54 k SNP chip data. Ten commercially relevant egg quality traits including albumen height, shell strength, shell colour, egg weight and yolk weight collected from up to 1,420 White Leghorn chickens were analysed. The results showed that the genomic heritability estimates based on low-pass sequencing data were higher than those based on SNP chip data. Although two GWAS analyses showed similar overall landscape for most traits, low-pass sequencing captured some significant SNPs that were not on the SNP chip. In GWAS analysis using 54 k SNP chip data, after including more individuals (up to 5,700), additional significant SNPs not detected by low-pass sequencing data were found. In conclusion, GWAS using low-pass sequencing data showed similar results to those with SNP chip data and may require much larger sample sizes to show measurable advantages.
    Mesh-Begriff(e) Animals ; Chickens/genetics ; Genome-Wide Association Study/veterinary ; Oligonucleotide Array Sequence Analysis/veterinary ; Phenotype ; Polymorphism, Single Nucleotide
    Sprache Englisch
    Erscheinungsdatum 2022-04-11
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 631363-2
    ISSN 1439-0388 ; 0044-3581 ; 0931-2668 ; 1742-4488
    ISSN (online) 1439-0388
    ISSN 0044-3581 ; 0931-2668 ; 1742-4488
    DOI 10.1111/jbg.12679
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  9. Artikel ; Online: Flora and vegetation of the province of Huamanga (Ayacucho-Peru)

    De la Cruz-Arango Jesús / Gómez-Carrión José / Chanco-Estela Magda / Carrillo-Fuentes Elida Paulina / Aucasime-Medina Laura

    Journal of the Selva Andina Biosphere, Vol 8, Iss 1, Pp 3-

    2020  Band 18

    Abstract: The flora and vegetation of the province of Huamanga (Peru) was studied, with the purpose of knowing the diversity of species, plant formations, as well as the endemicity and degree of threat of the registered species. Intensive botanical collections ... ...

    Abstract The flora and vegetation of the province of Huamanga (Peru) was studied, with the purpose of knowing the diversity of species, plant formations, as well as the endemicity and degree of threat of the registered species. Intensive botanical collections were carried out in the vegetal formations and different altitudinal floors, through transects and in different directions, considering the city of Ayacucho as the starting point. 864 species belonging to 454 genera and 108 families were identified among trees, shrubs and herbs. 91 families, 371 genera and 705 species of the Class Magnoliopsida and 17 families with 83 genera and 159 species of the Class Liliopsida. The most represented families, Asteraceae 155 species, followed by Poaceae 98 and Papilionaceae with 44, respectively. The most dominant genera were Senecio with 23 species, Calceolaria 15, Baccharis 14, Solanum 12, Plantago 9, Lupinus, Peperomia and Urtica 8 species each. 60% were herbaceous, followed by arboreal 13% and shrub 11% and the others in smaller percentage. The vegetal formations that exist in the zone of study are the Tunales, Algarrobales, Monte ribereño, Titankales, Quiñuales, Bofedales, Cesped de puna and mixed communities. The distribution of the species according to the altitudinal levels is 30% in the lower part, 28% in the middle part and 27% in the upper part. Only 2% is widely distributed in the three sectors, while in two sectors: Low - Medium 5% and Medium - High 8%. Forty-eight species were found to be threatened, comprising 42 genera and 33 families. Critically Endangered 9 species, Endangered 8, Vulnerable 17. In addition, 20 endemic species were recorded, the Family Asteraceae and Cactaceae with 6 species, followed by Berberidaceae 4, the others with 2 and 1 species respectively.
    Schlagwörter flora and vegetation ; plant formations ; endemic species ; grassland ; bofedal ; xerophytic vegetation ; Forestry ; SD1-669.5 ; Plant culture ; SB1-1110 ; Plant ecology ; QK900-989
    Thema/Rubrik (Code) 590 ; 580
    Sprache Englisch
    Erscheinungsdatum 2020-05-01T00:00:00Z
    Verlag Selva Andina Research Society
    Dokumenttyp Artikel ; Online
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  10. Artikel ; Online: Endemic communities of Cactaceae in danger of extinction. A need for conservation of natural resources in the district of Pacaycasa. Ayacucho-Peru

    Huamaní-Sulca Roxana Erika / De La Cruz-Arango Jesús / Chuchón-Martinez Saúl / Pelaez-Pelaez Freddy

    Journal of the Selva Andina Biosphere, Vol 8, Iss 1, Pp 92-

    2020  Band 109

    Abstract: Endemic cactus communities were studied in San Cristobal hill. It is related to a group of plants that have a series of special morpho-physiological adaptations and play an important role in a xerophytic ecosystem where survival is difficult. It was ... ...

    Abstract Endemic cactus communities were studied in San Cristobal hill. It is related to a group of plants that have a series of special morpho-physiological adaptations and play an important role in a xerophytic ecosystem where survival is difficult. It was carried out during 2013, between altitudes of 2415 and 2750 meters above sea level with the purpose of analyzing its density, structure, and distribution, and conservation status of the species. Important information for decision making regarding these areas and species by the corresponding authorities. The sampling used is aleatory-stratified, with 24 plots of 50 x 50 m, established in three strata: low (< 2500 masl), medium (2500 to 2600 masl), and high (> 2600 masl). In each of the sample units, species were identified using taxonomic keys and population characteristics were evaluated, which were processed and analyzed with the help of computer tools Software R Version 3.0.0 and Microsoft Excel 2013. The results showed 5 endemic species: B. hertlingiana, E. peruviana, C. quadrangularis, C. ayacuchoensis and O. doelzianus, four species have low population densities, O. doelzianus, C. ayacuchoensis, E. peruviana and C. quadrangularis with 16, 14, 9, and 8 plants/ha, while B. hertlingiana has a higher density with 134 plants/ha. According to the conservation status, two endemic species, C. ayacuchoensis and C. quadrangularis, are in the endangered category with a low population density. They present a pattern of crowded distribution and natural regeneration. However, these endemic species are endangered by different threats such as natural and anthropogenic disturbance, mainly because of the population growth that generates logging and destruction of ecosystems for housing construction.
    Schlagwörter cacti ; endemic ; endemism ; flora ; vegetation ; xerophytic ; biodiversity ; andes ; ayacucho ; Forestry ; SD1-669.5 ; Plant culture ; SB1-1110 ; Plant ecology ; QK900-989
    Thema/Rubrik (Code) 580
    Sprache Englisch
    Erscheinungsdatum 2020-11-01T00:00:00Z
    Verlag Selva Andina Research Society
    Dokumenttyp Artikel ; Online
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