Document Detail


Genetic and economic analyses of sow replacement rates in the commercial tier of a hierarchical swine breeding structure.
MedLine Citation:
PMID:  8325798     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Commercial-level sow replacement rates were investigated for a 10-yr planning horizon using a stochastic life-cycle swine production model. A three-tiered breeding structure was modeled for the production of market hogs in a three-breed static crossing scheme. Growth and reproductive traits of individual pigs were simulated using genetic, environmental, and economic parameters. Culling was after a maximum of 1, 5, or 10 parities in commercial levels within 1- and 5-parity nucleus and 1-, 5-, and 10-parity multiplier combinations. Yearly changes and average phenotypic levels were computed for pig and sow performance and economic measures. For growth traits, greater commercial level response was for systems with higher sow replacement rates, 110 to 115% of lowest response. Phenotypic changes in net returns ranged from $.85 to 1.01 x pig-1 x yr-1. Average growth performances were highest for systems with greatest genetic trend. Highest kilograms.sow-1 x year-1 finished was for 10-parity commercial alternatives. System differences in total costs and returns per pig resulted primarily from differences in replacement costs. Removal of the gilt system from analyses often reduced ranges among systems for economic measures by more than 70%. Systems with the lowest commercial replacement rates were most profitable. Within these systems, those with higher genetic change had highest net returns. For high replacement rates, no more than 175% of market value could be paid for gilts, but with lower sow replacement rates commercial units could justify as much as 450%.
Authors:
M A Faust; O W Robison; M W Tess
Related Documents :
15696298 - A comprehensive approach to identifying monitoring priorities of small landbirds on mil...
8244868 - Accidental superphosphate fertilizer poisoning in pregnant ewes.
24007358 - Association between out-of-home trips and older adults' functional fitness.
25118838 - Treatment of exertional heat stress developed during low or moderate physical work.
16311928 - Superoxide production and oxygen consumption in endothelium-intact and -denuded artery ...
17299108 - Adipose tissue interleukin-18 mrna and plasma interleukin-18: effect of obesity and exe...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  71     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1993 Jun 
Date Detail:
Created Date:  1993-08-10     Completed Date:  1993-08-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1400-6     Citation Subset:  IM    
Affiliation:
Department of Animal Science, North Carolina State University, Raleigh 27695-7621.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adipose Tissue / growth & development
Animals
Breeding* / economics
Costs and Cost Analysis
Female
Income
Litter Size
Models, Biological
Parity
Regression Analysis
Reproduction / genetics
Swine / genetics*,  growth & development,  physiology
Weight Gain

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Effects of barley variety and restricted versus ad libitum intake on rate, site, and extent of diges...
Next Document:  The effect of United States versus New Zealand Angus germplasm on characteristics of crossbred calve...