Document Detail

The effects of age at photostimulation and dietary protein intake on reproductive efficiency in three strains of broiler breeders varying in breast yield.
MedLine Citation:
PMID:  12033407     Owner:  NLM     Status:  MEDLINE    
The effects of strain, age at photostimulation, and dietary CP intake during the early lay period on sexual maturation and egg production parameters in broiler breeder hens were determined. Three Arbor Acres strains, Classic, Feather Sexable Yield (FSY), and an experimental line (EXP), were reared in floor pens. At 19 wk of age, pullets were moved into individual cages. At 20 wk of age one-half of the birds were photostimulated by increasing the day length from 8L:16D to 15L:9D. The remaining birds were photostimulated at 23 wk of age. The birds were fed 16 or 18% CP diets from 19 to 32 wk of age. The Classic hens achieved sexual maturity 4 d before the EXP hens. Delaying photostimulation to 23 wk of age delayed sexual maturity but the rate of sexual maturation was accelerated after photostimulation occurred. Egg weight at sexual maturity was higher for the later photostimulated birds. The FSY and EXP hens, selected for more white-meat yield than the Classic hens, were heavier in BW but had lower settable egg production than the latter. Feeding 18% CP resulted in a higher BW throughout the trial, as compared to the 16% CP diet. There was a response to dietary CP and photostimulation age on initial egg weight and the number of double-yolked eggs. Early photostimulation was not advantageous because egg production parameters were not affected. Both Classic and FSY strains performed well when fed 18% CP; however, EXP hens benefited from 16% CP intake.
N S Joseph; A A J Dulaney; F E Robinson; R A Renema; M J Zuidhof
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  81     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-29     Completed Date:  2003-01-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  597-607     Citation Subset:  IM    
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada.
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MeSH Terms
Age Factors
Chickens / genetics,  growth & development,  physiology*
Dietary Proteins / administration & dosage*
Eggs / analysis,  standards
Oviposition / genetics,  physiology*,  radiation effects
Photic Stimulation*
Random Allocation
Reproduction / genetics,  physiology,  radiation effects
Sexual Maturation / genetics,  physiology*,  radiation effects
Weight Gain / genetics,  physiology,  radiation effects
Reg. No./Substance:
0/Dietary Proteins

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

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