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Description
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 |
Degree: | Ph.D. |
Genre: | Dissertation |
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 |
Type: | Text |
Language: | English |
Description: | 258 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. |
URI: | http://hdl.handle.net/2142/87141 |
Other Identifier(s): | (MiAaPQ)AAI9944948 |
Date Available in IDEALS: | 2015-09-28 |
Date Deposited: | 1999 |
This item appears in the following Collection(s)
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Dissertations and Theses - Veterinary Clinical Medicine
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Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois