rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Heterosis and heterosis retention for measures of female productivity of cattle of diverse biological types
  name:
    name part: Sacco, Randy Eugene.
    role:
      role term: creator
  name:
    name part: Baker, Jerome F.
    role:
      role term: degree supervisor.
  name:
    name part: Cartwright, T. C.
    role:
      role term: degree supervisor.
  name:
    name part: Matis, J. H.
    role:
      role term: degree committee member.
  name:
    name part: Sanders, James O.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1987
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiii, 140 leaves ; 29 cm
  abstract: Breeding, calving and weaning records of cows produced in a diallel of Angus, Brahman, Hereford, Holstein and Jersey were used to characterize these breed types for measures of female productivity. First-generation crossbred females were 35 d younger (P<.05), 18 kg heavier (P<.05) and 2.0 cm taller (P<.01) at first calving than contemporary straightbreds; however, these two groups did not differ for number of services. Second-generation crosses were 16 kg heavier (P<.05) and 2.4 cm taller (P<.01) at first calving than second-generation straightbreds; differences between these two groups for number of services and age at first calving were nonsignificant. Brahman and Brahman crosses tended to exhibit the longest gestation length and calving interval during the inter se phase, but were intermediate for calving interval during the terminal cross phase. Average F₁ and F₂ heterosis estimates for gestation length and calving interval were small and nonsignificant. Second-generation crossbred calves exceeded contemporary straightbreds by.97 kg (P<.01), .34 cm (P<.01) and .15 cm (P<.05) for birth weight and shoulder and hip width, respectively. Estimates of F₃ heterosis for birth characters were nonsignificant. Estimates of average maternal heterosis retained were significant for shoulder and hip width. No differences were detected (P >.05) for birth characters of terminal cross calves out of crossbred and straightbred dams. Holstein cows weaned the largest calves during both phases of this study; Jersey weaned the smallest inter se calves while Hereford weaned the smallest terminal cross calves. Estimates of F₂ heterosis were 14.7 kg (P<.01), 2.10 cm (P<.01) and 9.7% (P<.01) for weaning weight and height and survival to weaning, respectively. Average F₃ heterosis estimates were significant for weaning weight and height while average maternal heterosis retained was significant for weaning height. Calves out of F₁ dams were significantly larger at weaning than calves out of …
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. in Animal Breeding Texas A & M University 1987
  note: Includes bibliographical references (leaves 130-139).
  subject:
    topic: Cattle
    topic: Breeding
  subject:
    topic: Cattle
    topic: Reproduction
  subject:
    topic: Heterosis
  subject:
    topic: Major animal breeding
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-754599
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-754599
  record info:
    record content source: TXA
    record creation date: 890105
    record change date: 20220104090352.0
    record identifier: in00000741716
    language of cataloging:
      language term: eng