Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Galleher, Catherine ElizabethSubject: search.filters.subject.Endocrinology

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    Characterizing the hypothalamic-pituitary-gonadal axis in turkeys genetically selected for increased egg production
    (2020) Galleher, Catherine Elizabeth; Porter, Tom E; Animal Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Within the United States, the turkey industry has historically focused on increased meat production. Studies have shown that there is a negative correlation between meat and egg production. Previous research in our laboratory compared high egg producing hens (HEPH) to low egg producing hens (LEPH). It was found that HEPH express increased levels of mRNA for genes associated with stimulating the hypothalamic-pituitary-gonadal (HPG) axis. We also demonstrated that the hypothalamic-pituitary-thyroid (HPT) axis exerts some effect on egg production. In order to increase our understanding of differences in egg production, we focused on a genetically selected line with increased egg production (E line) and a random bred control line (RBC1). Related to the HPG axis, differences were found related to steroidogenesis and feedback mechanisms. Within the HPT axis, the RBC1 line tended to have increased mRNA levels of genes associated with stimulation of the axis compared to E line.