Document Detail

A further look at evidence for cytoplasmic inheritance of production traits in dairy cattle.
MedLine Citation:
PMID:  3558924     Owner:  NLM     Status:  MEDLINE    
A recent study interpreted significant effects of source of cytoplasm as evidence for cytoplasmic inheritance. An alternative interpretation that observed results reflected residual additive genetic effects unaccounted for by statistical models used was tested by computer simulation of records over 60 yr for milk yield (h2 = .30) and fat percentage (h2 = .60) under an additive genetic model with no cytoplasmic effects. First lactation records for the last 30 yr were analyzed by least squares according to models that included effects of cytoplasmic source, generations to cytoplasmic source, herd, and year as well as effects of sire (model 1), sire and record of dam (model 2), Predicted Difference of sire (model 3), or Predicted Difference of sire and 1/2 Predicted Difference of maternal grandsire (model 4). Ten replicates were performed. Significant cytoplasmic effects were observed for all models in at least 8 of 10 replicates for milk yield and in all replicates for fat percentage. Average F ratios for cytoplasmic effects were 1.43, 1.25, 1.46, and 1.43 for milk yield and 2.00, 1.29, 2.04, and 1.96 for fat percentage for models 1, 2, 3, and 4. Cytoplasmic variances were 1.4 and 3.2% of residual variances for milk yield and fat percentage for model 1. Unaccounted for additive genetic effects can produce spurious cytoplasmic effects.
B W Kennedy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  69     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1986 Dec 
Date Detail:
Created Date:  1987-05-21     Completed Date:  1987-05-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3100-5     Citation Subset:  IM    
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MeSH Terms
Cattle / genetics*
Cytoplasm / physiology*
Extrachromosomal Inheritance*
Lactation / physiology*

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

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