Document Detail


The effect of selection in retrospect on lifetime production efficiency in sheep.
MedLine Citation:
PMID:  6436219     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Within 32 crossbred group-management system-birth year subgroups, "selection in retrospect" was practiced based upon several ewe lamb traits, singly or in combination, to assess what the effect of such selection would have been on ewe lifetime production efficiency. Ewes were from two birth years, eight crossbred groups and two management systems. Ewe's type of birth, date of birth, actual and adjusted weaning weight (WWt and AWWt), postweaning weight (PWWt) and first yr gross income (FGROS) were the ewe lamb traits involved in the single trait paper selection schemes. Only the ewe lamb weights (WWt, AWWt and PWWt) caused a significant increase in the production efficiency of selected populations over those of the corresponding unselected populations. When postweaning weight was used jointly with the ewe's type of birth in an independent culling level selection scheme, both the group composed of heavier multiple-born ewes and the group composed primarily of single-born ewes were more productive than the group composed of lighter weight multiple-born ewes. Backward selection of the elite ewes having the best production efficiency also showed that the heavier the ewe lamb, the more efficient she was expected to be. Examination of ewes surviving the entire duration of the experiment failed to identify any early life trait that predicted longevity. Furthermore, surviving ewes were equally variable in their early life traits to the populations at large. Longevity, however, was positively related to lifetime efficiency.
Authors:
N B Saoud; W D Hohenboken
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  59     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1984 Sep 
Date Detail:
Created Date:  1984-12-05     Completed Date:  1984-12-05     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  620-9     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animal Husbandry / economics*
Animals
Body Weight
Cost-Benefit Analysis
Crosses, Genetic
Female
Parity
Reproduction*
Selection, Genetic
Sheep / genetics*,  physiology
Weaning

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


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