GENETIC PARAMETERS FOR BODY WEIGHT AND LAYING TRAITS IN MAZANDARAN NATIVE BREEDER HENS

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SHADPARVAR A.A.; ENAYATI B.

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF APPLIED ANIMAL SCIENCE Year:2012 | Volume:2 | Issue:3 Page(s): 251-256

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Title

GENETIC PARAMETERS FOR BODY WEIGHT AND LAYING TRAITS IN MAZANDARAN NATIVE BREEDER HENS

Author(s)

SHADPARVAR A.A. | ENAYATI B. | Issue Writer Certificate

Keywords

AGE AT SEXUAL MATURITY

BODY WEIGHT

EGG WEIGHT

GENETIC PARAMETERS

MAZANDARAN NATIVE BREEDER HENS

Abstract

Heritability, environmental and genetic correlations between BODY WEIGHT at hatch (BW0), eight (BW8) and twelve (BW12) weeks of age, BODY WEIGHT at sexual maturity (BWM), AGE AT SEXUAL MATURITY (AFE), the weight of the first egg laid by the hen (EWM), the mean EGG WEIGHT from 28 to 32 wks (EW28-32) and egg numbers (ENs) were estimated by the restricted maximum likelihood method under an animal model. Data were from six generations (generation ten to fifteen) of hens kept at the Mazandaran Breeding Center of Iran. Heritability estimates for BW0, BW8, BW12, BWM, AFE, EWM, EW28-32 and ENs were 0.134, 0.235, 0.296, 0.247, 0.344, 0.125, 0.240 and 0.156, respectively. Genetic correlations between pairs of BODY WEIGHT measures were moderate with a range from 0.17 to 0.43. Generally, correlations of BODY WEIGHT traits with AFE were weak. Genetic correlation between BW8 and AFE was low, but favorable (-0.17). Egg numbers has unfavorable genetic correlation with BWM (-0.47). However, EGG WEIGHT traits had favorable genetic correlation with BODY WEIGHT traits, except BW0, which was almost equal to zero. Age at first egg had negative genetic correlation with egg numbers, but positive correlations with EGG WEIGHT traits. The absolute value of environmental correlations between traits varied from 0.00 to 0.39. The strongest environmental correlation was found between AFE and EWM. There was moderate and positive environmental correlation between BW8 and BW12 as well as between BW12 and BWM. The results showed that there are considerable genetic variations in important traits of Mazandaran native hens, and that selection on BW8, ENs and EWM, which are the most economically important traits in this breed, could be effective.

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APA: Copy

SHADPARVAR, A.A., & ENAYATI, B.. (2012). GENETIC PARAMETERS FOR BODY WEIGHT AND LAYING TRAITS IN MAZANDARAN NATIVE BREEDER HENS. IRANIAN JOURNAL OF APPLIED ANIMAL SCIENCE, 2(3), 251-256. SID. https://sid.ir/paper/580431/en

Vancouver: Copy

SHADPARVAR A.A., ENAYATI B.. GENETIC PARAMETERS FOR BODY WEIGHT AND LAYING TRAITS IN MAZANDARAN NATIVE BREEDER HENS. IRANIAN JOURNAL OF APPLIED ANIMAL SCIENCE[Internet]. 2012;2(3):251-256. Available from: https://sid.ir/paper/580431/en

IEEE: Copy

A.A. SHADPARVAR, and B. ENAYATI, “GENETIC PARAMETERS FOR BODY WEIGHT AND LAYING TRAITS IN MAZANDARAN NATIVE BREEDER HENS,” IRANIAN JOURNAL OF APPLIED ANIMAL SCIENCE, vol. 2, no. 3, pp. 251–256, 2012, [Online]. Available: https://sid.ir/paper/580431/en

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