1. bookVolume 21 (2021): Issue 4 (October 2021)
Journal Details
First Published
25 Nov 2011
Publication timeframe
4 times per year
access type Open Access

Temporal Trends in Performance and Hatchability Traits of Eight Strains of Hens Covered by the Gene Pool Protection Programme in Poland

Published Online: 28 Oct 2021
Page range: 1347 - 1366
Received: 25 Nov 2020
Accepted: 29 Jul 2021
Journal Details
First Published
25 Nov 2011
Publication timeframe
4 times per year

The aim of the study was to determine trends in performance and hatchability traits of eight strains of hens that have been covered by the gene pool protection programme in Poland over ten years/generations. The study involved conservation populations of laying hens: Greenleg Partridge (Z-11), Yellowleg Partridge (Ż-33), Sussex (S-66), Leghorn (H-22, G99), Rhode Island Red (R-11, K-22) and Rhode Island White (A-33), which were maintained at the Experimental Station of the National Research Institute of Animal Production in Chorzelów. The following productive traits were analysed for each population: body weight at 20 wk (g), egg weight at 33 and 53 wk, sexual maturity and number of eggs laid per hen up to 56 wk of age. Mortality and culling were also recorded during rearing and production periods. Furthermore, effective population size (Ne) and inbreeding coefficient in the population (Fx) were calculated for each strain. The analysis of the performance results of the eight strains of hens and their trends indicate that the methods of conservation breeding adopted for these populations enable effective implementation of the conservation programme. The strains were found to differ in all the performance traits subjected to evaluation. Over the 10 generations, the strains examined showed high survival and hatchability parameters during both rearing and production periods. The currently used random mating system proved effective to prevent the populations from an increase of inbreeding. However, a worrying downward trend in body weight was observed in some strains.


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