Eggshell Appearance Does Not Signal Maternal Corticosterone Exposure in Japanese Quail: An Experimental Study with Brown-Spotted Eggs
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{"title"=>"Eggshell appearance does not signal maternal corticosterone exposure in Japanese quail: An experimental study with brown-spotted eggs", "type"=>"journal", "authors"=>[{"first_name"=>"Camille", "last_name"=>"Duval", "scopus_author_id"=>"35956072400"}, {"first_name"=>"Phillip", "last_name"=>"Cassey", "scopus_author_id"=>"6701623283"}, {"first_name"=>"Paul G.", "last_name"=>"Lovell", "scopus_author_id"=>"9639749500"}, {"first_name"=>"Ivan", "last_name"=>"Mikšík", "scopus_author_id"=>"7005959854"}, {"first_name"=>"S. James", "last_name"=>"Reynolds", "scopus_author_id"=>"8862337900"}, {"first_name"=>"Karen A.", "last_name"=>"Spencer", "scopus_author_id"=>"8701423600"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "pui"=>"372069644", "sgr"=>"84891760723", "doi"=>"10.1371/journal.pone.0080485", "scopus"=>"2-s2.0-84891760723", "pmid"=>"24312476"}, "id"=>"c3ef95e9-51ab-3b29-aefd-277e690a2d53", "abstract"=>"Reproduction is a critical period for birds as they have to cope with many stressful events. One consequence of an acute exposure to stress is the release of corticosterone, the avian stress hormone. Prolonged stress can have negative impacts on the immune system, resulting in, for example, increased oxidative stress. Through maternal effects, females are known to modulate their investment in eggs content according to their own physiological condition. Less is known about maternal investment in eggshells, especially in pigments. The two main eggshell pigments may possess opposite antioxidant properties: protoporphyrin (brown) is a pro-oxidant, whereas biliverdin (blue-green) is an antioxidant. In Japanese quail, we know that the deposition of both pigments is related to female body condition. Thus, a chronic stress response may be reflected in eggshell coloration. Using female Japanese quails that lay brown-spotted eggs, we explored whether physiological exposure to corticosterone induces a change in female basal stress and antioxidant factors, and eggshell pigment concentration, spectrophotometric reflectance, and maculation coverage. We supplemented adult females over a 2 week period with either peanut oil (control) or corticosterone (treatment). We collected pre- and post-supplementation eggs and analysed the effect of corticosterone treatment on female physiology and eggshell appearance parameters. Except for corticosterone-fed birds which laid eggs with brighter spots, supplementation had no significant effect on female physiology or eggshell pigment concentration, reflectance and maculation. The change in eggshell spot brightness was not detected by a photoreceptor noise-limited color opponent model of avian visual perception. Our data confirms that eggshell reflectance in spotted eggs varies over the laying sequence, and spot reflectance may be a key factor that is affected by females CORT exposure, even if the changes are not detected by an avian visual model.", "link"=>"http://www.mendeley.com/research/eggshell-appearance-not-signal-maternal-corticosterone-exposure-japanese-quail-experimental-study-br", "reader_count"=>20, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>1, "Researcher"=>3, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>10, "Student > Master"=>1, "Student > Bachelor"=>2, "Professor"=>1}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>1, "Researcher"=>3, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>10, "Student > Master"=>1, "Student > Bachelor"=>2, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>1, "Environmental Science"=>2, "Biochemistry, Genetics and Molecular Biology"=>2, "Agricultural and Biological Sciences"=>14, "Medicine and Dentistry"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>14}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Unspecified"=>{"Unspecified"=>1}, "Environmental Science"=>{"Environmental Science"=>2}}, "reader_count_by_country"=>{"United Kingdom"=>1, "South Africa"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1302058"], "description"=>"<p>Female Japanese quails were either fed with peanut oil alone (controls) or with CORT within peanut oil (see text for details). Open bars and grey bars represent pre-treatment and post-treatment effects, respectively. The boundary of the box closest to zero indicates the 25th percentile, the line within the box marks the median, and the boundary of the box farthest from zero indicates the 75th percentile. Whiskers indicate standard errors. Different lowercase letters reflect statistically significant differences.</p>", "links"=>[], "tags"=>["cort", "supplementation", "eggshell", "brightness"], "article_id"=>867425, "categories"=>["Biological Sciences"], "users"=>["Camille Duval", "Phillip Cassey", "Paul G. Lovell", "Ivan Mikšík", "S. James Reynolds", "Karen A. Spencer"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0080485.g001", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Effect_of_CORT_supplementation_on_eggshell_spot_brightness_mean_177_1_SE_N_8202_8202_123_/867425", "title"=>"Effect of CORT supplementation on eggshell spot brightness (mean±1 SE; N = 123).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-12-03 03:41:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/1302059"], "description"=>"<p>The 22 female Japanese quails were exposed to ad libitum food with peanut oil supplementation or CORT supplementation. Time corresponds to the measurements performed before and after the CORT supplementation, and group corresponds to CORT-fed or control birds. Bold text indicates statistical significance.</p>", "links"=>[], "tags"=>["cort", "supplementation", "eggshell", "japanese", "quail", "df"], "article_id"=>867426, "categories"=>["Biological Sciences"], "users"=>["Camille Duval", "Phillip Cassey", "Paul G. Lovell", "Ivan Mikšík", "S. James Reynolds", "Karen A. Spencer"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0080485.t002", "stats"=>{"downloads"=>0, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Effect_of_CORT_supplementation_see_text_for_details_on_eggshell_color_parameters_descriptive_model_of_Japanese_quail_GLMM_df_8202_8202_1_N_8202_8202_123_/867426", "title"=>"Effect of CORT supplementation (see text for details) on eggshell color parameters (descriptive model) of Japanese quail (GLMM, df  = 1, N = 123).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-12-03 03:41:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/1302061"], "description"=>"<p>All females were exposed to ad libitum food with peanut oil supplementation or CORT supplementation. Time corresponds to the blood sampling performed before and after the CORT supplementation, and group corresponds to CORT-fed or control birds.</p>", "links"=>[], "tags"=>["cort", "supplementation", "physiological", "japanese", "quail"], "article_id"=>867428, "categories"=>["Biological Sciences"], "users"=>["Camille Duval", "Phillip Cassey", "Paul G. Lovell", "Ivan Mikšík", "S. James Reynolds", "Karen A. Spencer"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0080485.t001", "stats"=>{"downloads"=>0, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Effect_of_CORT_supplementation_see_text_for_details_on_female_physiological_parameters_of_Japanese_quail_GLMM_/867428", "title"=>"Effect of CORT supplementation (see text for details) on female physiological parameters of Japanese quail (GLMM).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-12-03 03:41:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/1302062", "https://ndownloader.figshare.com/files/1302063"], "description"=>"<div><p>Reproduction is a critical period for birds as they have to cope with many stressful events. One consequence of an acute exposure to stress is the release of corticosterone, the avian stress hormone. Prolonged stress can have negative impacts on the immune system, resulting in, for example, increased oxidative stress. Through maternal effects, females are known to modulate their investment in eggs content according to their own physiological condition. Less is known about maternal investment in eggshells, especially in pigments. The two main eggshell pigments may possess opposite antioxidant properties: protoporphyrin (brown) is a pro-oxidant, whereas biliverdin (blue-green) is an antioxidant. In Japanese quail, we know that the deposition of both pigments is related to female body condition. Thus, a chronic stress response may be reflected in eggshell coloration. Using female Japanese quails that lay brown-spotted eggs, we explored whether physiological exposure to corticosterone induces a change in female basal stress and antioxidant factors, and eggshell pigment concentration, spectrophotometric reflectance, and maculation coverage. We supplemented adult females over a 2 week period with either peanut oil (control) or corticosterone (treatment). We collected pre- and post-supplementation eggs and analysed the effect of corticosterone treatment on female physiology and eggshell appearance parameters. Except for corticosterone-fed birds which laid eggs with brighter spots, supplementation had no significant effect on female physiology or eggshell pigment concentration, reflectance and maculation. The change in eggshell spot brightness was not detected by a photoreceptor noise-limited color opponent model of avian visual perception. Our data confirms that eggshell reflectance in spotted eggs varies over the laying sequence, and spot reflectance may be a key factor that is affected by females CORT exposure, even if the changes are not detected by an avian visual model.</p></div>", "links"=>[], "tags"=>["maternal", "corticosterone", "japanese", "brown-spotted"], "article_id"=>867429, "categories"=>["Biological Sciences"], "users"=>["Camille Duval", "Phillip Cassey", "Paul G. Lovell", "Ivan Mikšík", "S. James Reynolds", "Karen A. Spencer"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0080485.s001", "https://dx.doi.org/10.1371/journal.pone.0080485.s002"], "stats"=>{"downloads"=>1, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Eggshell_Appearance_Does_Not_Signal_Maternal_Corticosterone_Exposure_in_Japanese_Quail_An_Experimental_Study_with_Brown_Spotted_Eggs_/867429", "title"=>"Eggshell Appearance Does Not Signal Maternal Corticosterone Exposure in Japanese Quail: An Experimental Study with Brown-Spotted Eggs", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2013-12-03 03:41:29"}

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