INFLUENCE OF MATERNAL COMMON ENVIRONMENTAL EFFECTS ON GENETIC PARAMETERS OF BODY WEIGHT IN DIFFERENT AGES IN BALUCHI LAMBS BREED

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ABBASI M.A.; VAEZ TORSHIZI R.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2008 | Volume:15 | Issue:1 Page(s): 39-46

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Title

INFLUENCE OF MATERNAL COMMON ENVIRONMENTAL EFFECTS ON GENETIC PARAMETERS OF BODY WEIGHT IN DIFFERENT AGES IN BALUCHI LAMBS BREED

Author(s)

ABBASI M.A. | VAEZ TORSHIZI R. | Issue Writer Certificate

Keywords

MATERNAL COMMON ENVIRONEMENTAL EFFECTSQ3

GENETIC PARAMETERSQ3

BODY WEIGHTQ4

BALUCHI BREEDQ3

Abstract

The objective of this study was to estimate maternal common environmental effects on (co) variances and GENETIC PARAMETERS of birth weight (BW), weaning weight (WW) and live weights in six months (SW) in two flocks of Baluchi lambs breed in Abbas-Abad sheep breeding station in Mashhad. Data were analyzed using two animal models without (model 1) and with (model 2) maternal common environmental effect. The proportions of maternal common environmental effect to phenotypic variance (t2) were estimated as 0.14, 0.068 and 0.099 for BW, WW and SW, respectively, in flock 1. The estimates for these traits were 0.246, 0.038 and 0.040 in flock 2. Including t2 in animal model reduced direct heritability of BW 12.2 and 7.7 percentages in flocks 1 and 2 respectively, but direct heritabilites of WW and SW did not changed. Effects of t2 on maternal heritabilities of all traits were negligible. The inclusion of t2 in model decreased maternal permanent environmental effect as the proportion of phenotypic variance (c2) from 0.104 to 076 for BW, from 0.073 to 0.060 for WW and from 0.056 to 0.043 for SW in flock 1. c2 were also decreased from 0.098 to 0.083, 0.082 to 0.080 and 0.034 to 0.031 for BW, WW, SW in flock 2, resp. Reductions of the residual variances for BW, WW and SW were 17.9, 6.8 and 7 percentages in flock1 and were 35.5, 9.3 and 4 percentages in flock2, resp. The results of current study showed that the effect of t2 on BW was higher than WW and SW. Effect of t2 on weight traits was also higher than c2 effect. Therefore, including t2 in animal models for weight traits especially at early ages is recommended.

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APA: Copy

ABBASI, M.A., & VAEZ TORSHIZI, R.. (2008). INFLUENCE OF MATERNAL COMMON ENVIRONMENTAL EFFECTS ON GENETIC PARAMETERS OF BODY WEIGHT IN DIFFERENT AGES IN BALUCHI LAMBS BREED. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 15(1), 39-46. SID. https://sid.ir/paper/9576/en

Vancouver: Copy

ABBASI M.A., VAEZ TORSHIZI R.. INFLUENCE OF MATERNAL COMMON ENVIRONMENTAL EFFECTS ON GENETIC PARAMETERS OF BODY WEIGHT IN DIFFERENT AGES IN BALUCHI LAMBS BREED. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2008;15(1):39-46. Available from: https://sid.ir/paper/9576/en

IEEE: Copy

M.A. ABBASI, and R. VAEZ TORSHIZI, “INFLUENCE OF MATERNAL COMMON ENVIRONMENTAL EFFECTS ON GENETIC PARAMETERS OF BODY WEIGHT IN DIFFERENT AGES IN BALUCHI LAMBS BREED,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 15, no. 1, pp. 39–46, 2008, [Online]. Available: https://sid.ir/paper/9576/en

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