Title page for ETD etd-08192011-145148


Type of Document Master's Thesis
Author Albrecht, Heather Nicole
Author's Email Address albrec41@vt.edu
URN etd-08192011-145148
Title Reproductive Soundness and Egg Quality in Chickens Selected for Low and High Antibody Response
Degree Master of Science
Department Animal and Poultry Sciences
Advisory Committee
Advisor Name Title
Lewis, Ronald M. Committee Chair
Pierson, Frank William Committee Member
Siegel, Paul B. Committee Member
Keywords
  • , Mycoplasma gallisepticum
  • Egg Quality
  • Reproductive Soundness
  • Sheep Red Blood Cells
Date of Defense 2011-08-11
Availability unrestricted
Abstract
For 36 generations, White Leghorn chickens were selected for high (HAS) or low (LAS) antibody response to sheep red blood cells. The focus of this thesis was to investigate correlated responses in reproductive soundness and egg quality resulting from that selection. Forty-five hens and 25 roosters from each antibody line were used. In hens, commencement and intensity of lay, and egg quality, were analyzed; in both sexes, length of fertility was considered. Hens and roosters were mated to an intercross line to avoid confounding selection with sex effects. The LAS line was more reproductively sound, commencing lay at a younger age (11.67 ± 3.53 d; P < 0.001), lighter body weight (-169.46 ± 40.20 g; P < 0.001) and with greater intensity (2.68 ± 0.25%; P = 0.001) than the HAS line. Additionally, the LAS line had a greater length of fertility (hens: 2.43 ± 0.55 d; P < 0.001; roosters: 3.11 ± 0.71 d; P < 0.001). In contrast to their poorer reproductive soundness, the HAS line had superior egg quality compared to the LAS line. Egg shape index (4.12 ± 0.55; P < 0.001) and albumen height, measured in both mm (0.27 ± 0.12 mm; P < 0.001) and Haugh units (1.89 ± 0.91; P = 0.04), were superior in HAS hens. Selection for increased antibody response appeared to compromise reproductive soundness, perhaps due to limitations in available resources. However, the selection did not compromise egg quality.
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