NDLI: Estimation of genetic parameters for body weight and egg production traits in Mazandaran native chicken

Content Provider	Springer Nature Link
Author	Niknafs, Shahram Nejati Javaremi, Ardeshir Mehrabani Yeganeh, Hassan Fatemi, Seyed Abolghasem
Copyright Year	2012
Abstract	Native chicken breeding station of Mazandaran was established in 1988 with two main objectives: genetic improvement through selection programs and dissemination of indigenous Mazandarani birds. (Co)variance components and genetic parameters for economically important traits were estimated using (bi) univariate animal models with ASREML procedure in Mazandarani native chicken. The data were from 18 generations of selection (1988–2009). Heritability estimates for body weight at different ages [at hatch (bw1), 8 (bw8), 12 (bw12) weeks of ages and sex maturation (wsm)] ranged from 0.24 ± 0.00 to 0.47 ± 0.01. Heritability for reproductive traits including age at sex maturation (asm); egg number (en); weight of first egg (ew1); average egg weight at 28 (ew28), 30 (ew30), and 32 (ew32) weeks of age; their averages (av); average egg weight for the first 12 weeks of production (ew12); egg mass (em); and egg intensity (eint) varied from 0.16 ± 0.01 to 0.43 ± 0.01. Generally, the magnitudes of heritability for the investigated traits were moderate. However, egg production traits showed smaller heritability compared with growth traits. Genetic correlations among egg weight at different ages were mostly higher than 0.8. On the one hand, body weight at different ages showed positive and relatively moderate genetic correlations with egg weight traits (ew1, ew28, ew30, ew32, ew12, and av) and varied from 0.30 ± 0.03 to 0.59 ± 0.02. On the other hand, low negative genetic correlations were obtained between body weight traits (bw1, bw8, bw12, and wsm) and egg number (en). Also, there is low negative genetic correlation (−24 ± 0.04 to −29 ± 0.05) between egg number and egg weight. Therefore, during simultaneous selection process for both growth and egg production traits, probable reduction in egg production due to low reduction in egg number may be compensated by increases in egg weight.
Starting Page	1437
Ending Page	1443
Page Count	7
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	44
Issue Number	7
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heritability Genetic correlation Chicken Economic traits Zoology Veterinary Medicine
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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