Document Detail


Reproductive traits of ewe lambs representing eight genetic types born in winter, spring, summer and fall.
MedLine Citation:
PMID:  3693146     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Crossbred ewe lambs of eight genetic types (Dorset X 3/4 Dorset, DD; Dorset X 3/4 Finn, DF; Finn X 3/4 Dorset, FD; Finn X 3/4 Finn, FF; Romanov X 3/4 Dorset, RD; Romanov X 3/4 Finn, RF; Romanov X Western, RW; and Western X Western, WW) were used to determine age and weight at conception, conception rate, ovulation rate, litter size and prenatal mortality. Each cross was represented in five different lamb crops born in winter, spring, summer and fall. High conception rates (greater than 88%) were obtained in all crops of ewe lambs, even in those born in June and exposed to rams the same year. Only Western ewe lambs born in June and exposed to rams in year of birth achieved low conception (59%). Ewe lambs born in October and missing the breeding season in the year of birth were more than 100 d older than ewe lambs born earlier in the calendar year and bred the same year. Prenatal mortalities varied widely (8 to 18%) among lamb crops, with management suspected to be a factor. Additive genetic effects in ovulation rate and litter size of the Romanov were similar to that of Finn. Romanov crosses (RF, RD, RW) conceived at the youngest age (226, 227, 231 d), demonstrating that Romanov is an early-maturing breed.
Authors:
J A Vesely; E E Swierstra
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  65     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1987 Nov 
Date Detail:
Created Date:  1988-02-20     Completed Date:  1988-02-20     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1195-200     Citation Subset:  IM    
Affiliation:
Research Station, Lethbridge, Alberta, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Weight
Crosses, Genetic*
Female
Litter Size
Ovulation
Pregnancy
Reproduction*
Seasons*
Sheep / genetics*

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


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