ORIGINAL PAPER
Egg specific gravity in improvement of hatchability
in laying hens
| 1 |
University of Life Sciences in Lublin, Chair for Biological Bases of Animal Production,
Akademicka 13, 20-950 Lublin, Poland |
| 2 |
Institute of Genetics and Animal Breeding, Polish Academy of Sciences,
Jastrzębiec, 05-552 Wólka Kosowska, Poland |
J. Anim. Feed Sci. 2011;20(1):84–92
Publication date: 2011-03-12
KEYWORDS
ABSTRACT
The aim of the study was to assess the suitability of egg specific gravity (ESG) as an
accompanying trait in estimation of the birds’ breeding value for hatchability. The study involved 3
generations of performance recorded laying hens Rhode Island White (RIW) and Rhode Island Red
(RIR). The breeding merit for number of chicks hatched from eggs laid (NCH) was estimated with
three different model variants which differed with regard to the information accounted for: 1. all the
standard information plus post factum hatchability record and ESG, 2. no post factum hatchability
data on the last generation but ESG present, and 3. no hatchability data on last generation nor
ESG. In both lines a high positive correlation between the egg specific gravity and hatchability was
observed (0.47 to 0.66). In RIR, when ESG was included in the left-hand-side, a significantly higher
concordance of birds’ NCH breeding value ranking between 2. and 1. than between 3. and 1. were
observed.
CORRESPONDING AUTHOR
I. Rozempolska-Rucińska 
University of Life Sciences in Lublin, Chair for Biological Bases of Animal Production,
Akademicka 13, 20-950 Lublin, Poland
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