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Calculation of Demographic Parameters in Tropical Livestock Herds
A discrete time approach with LASER animal-based monitoring data
eBook
Sofort lieferbar | Lieferzeit: Sofort lieferbar I
ISBN-13:
9789401790260
Veröffentl:
2014
Einband:
eBook
Seiten:
99
Autor:
Matthieu Lesnoff
eBook Typ:
PDF
eBook Format:
Reflowable eBook
Kopierschutz:
Digital Watermark [Social-DRM]
Sprache:
Englisch
Beschreibung:
Having indicators to assess the effect of zootechnical, sanitary, economic or political intervention or the impact of environmental risks makes it possible to draw up strategies for improving domestic animal populations. This handbook is a compilation of the main concepts relating to the definition and calculation of demographic rates for largely non-intensive tropical animal farms. It is intended to be educational, and should help students, technicians, engineers, researchers and development staff to understand the definitions and formulas encountered in the literature more clearly and make them more self-sufficient in terms of analyses.
Having indicators to assess the effect of zootechnical, sanitary, economic or political intervention or the impact of environmental risks makes it possible to draw up strategies for improving domestic animal populations. This handbook is a compilation of the main concepts relating to the definition and calculation of demographic rates for largely non-intensive tropical animal farms. It is intended to be educational, and should help students, technicians, engineers, researchers and development staff to understand the definitions and formulas encountered in the literature more clearly and make them more self-sufficient in terms of analyses.
1. Introduction.- 1.1. Background and objectives.- 1.2. Animal-based monitoring.- 1.3. A selection of parameters.- 1.4. Organization of the handbook.- 2. Grouping demographic data.- 2.1. Cohort splitting.- 2.2. Pseudo-cohort splitting.- 3. Mortality and offtake rates.- 3.1. One type of removal.- 3.2. Case with two types of removal.- 3.3. Additional points.- 4. Other demographic rates.- 4.1. Reproduction rates.- 4.2. Synthetic rates.- 4.3. Global demographic rates.- 5. Package laserdemog.- 5.1. R software.- 5.2. Functions in laserdemog.- 5.3. Additional points.- 6. Numerical examples.- 6.1. Example 1 – Overall description.- 6.2. Example 2 – More on reproduction rates.- 6.3. Example 3 – Test of a treatment on mortality.- 7. Annexes.- 7.1. Rates p and h in survival analyses.- 7.2. R materials.- 7.3. Structure of tables generated by hsplit and vsplit.- 8. Bibliography.