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Title:The Identification of Risk Factors for Mortality and Respiratory Disease in Lambs: An Evaluation of Risk Factor Based Health Management Strategies
Author(s):Nash, Marilyn Louise
Doctoral Committee Chair(s):Laura Hungerford
Department / Program:Veterinary Clinical Medicine
Discipline:Veterinary Clinical Medicine
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Animal Pathology
Abstract:The production simulation model evaluated two regression based strategies: decreased prevalence of poor milking ability (MLK) to <1% via culling over three years, and decreased prevalence of low birth weights (BWT) to 10% by improved gestational feeding. The comparison flock (BASE) had 15% poor milking ability and 25% low birth weight lambs. MLK strategy decreased POST and RM compared to BASE (0.4% and 0.8% respectively), but early years retained more replacement ewe lambs, lowered the number of market lambs, and initially decreased annual profits. Over ten years, average profits increased 0.7% under MLK, until the last seven years when poor milk prevalence was <1% and profits were 2.7% higher. The BWT strategy lowered PERI, POST, and RM (1%, 0.6%, 0.5% respectively). BWT increased profits by 12.6% over BASE, primarily due to the 2.9% increase in market lamb revenues, and was affected to a lesser extent by the 1% cost reduction associated with the lower mortality.
Issue Date:1999
Description:258 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
Other Identifier(s):(MiAaPQ)AAI9944948
Date Available in IDEALS:2015-09-28
Date Deposited:1999

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