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Genotype and Environmental Interaction in Growth and Milk Yield Traits of Indigenous Red Chittagong Cattle

Farzana Rahman
Dept. of Animal Breeding and Genetics, Faculty of Animal husbandry, Bangladesh Agricultural University, Mymensingh-2202

Md.Parvej Alam
Dept. of Animal Breeding and Genetics, Faculty of Animal husbandry, Bangladesh Agricultural University, Mymensingh-2202

Md. Azharul Hoque
Dept. of Animal Breeding and Genetics, Faculty of Animal husbandry, Bangladesh Agricultural University, Mymensingh-2202

A.K. Fazlul Haque Bhuiyan
Dept. of Animal Breeding and Genetics, Faculty of Animal husbandry, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

The present study was conducted to reveal the G×E interaction in growth and milk yield traits of indigenous Red Chittagong cattle reared in two production environments. Traits included: birth weight (BW), weaning weight (WW), average daily gain (ADG), daily milk yield (DMY), lactation length (LL) and lactation yield (LY). Data accumulated on a total of 161 animals during 2005 to 2012 in growth traits and 76 animals during 2005 to 2008 in milk yield traits. The heritability of BW, WW and ADG were 0.47±0.04, 0.49±0.17, 0.49±0.16 respectively and the heritability of DMY, LL, LY were 0.47± 0.07, 0.47±0.06 and 0.47±0.08, respectively. The effect of genotype x environment interaction was non-significant (p>0.05) on BW, WW and ADG whereas its effect was highly significant (p<0.001)on DMY, LL and LY.Correlations (genetic) between the breeding values of BW, WW and ADG in two production environment were 0.19, 0.13 and 0.11, respectively and correlations (genetic) between breeding values of DMY, LL and LY were 0.07, 0.18 and -0.01, respectively. The said genetic correlation values represented the degree of genotype by environment interaction arising on the RCC in the said two production environments.Traits with positive genetic correlation values indicate their acceptability (no difference) whereas traits with negative correlation values indicate that RCC parents should be selected and used separately in two production environments.

Keywords: Red Chittagong Cattle, Growth,Milk yield, G x E interaction

Location: Department of Animal Breeding and Genetics, Bangladesh Agricultural University (BAU), Mymensingh-2202

Start Date: 00-00-2005

End Date: 00-00-2008

Program Area: Animal Health and Management

Commodity: Cattle

Objectives:

This study aims to estimate the GxE interaction in RCC considering on-farm and on-station as two production environments.

Methodology:

The study was conducted at the Department of Animal Breeding and Genetics, Bangladesh Agricultural University (BAU), Mymensingh-2202. Data used in this study were collected from retrospective RCC Database maintained on two herds, Herd 1: data for growth performance observed on 76 calves and milk production observed on 22 cows were collected from the herd book records maintained at the Nucleus Herd at BAU, Mymensingh during 2005 to 2008, Herd 2:data for growth performance observed on 85 calves and data for milk production observed on 54 cows were collected from rural community herds at Char Jailkhana, Mymensingh Sadar, Mymensingh. Statistical analysis for estimation of G×E Two approaches were used for estimating G x E viz.SPSS 16.0 2007 computer program was used to estimate G×E interaction.In this study,factorial analysis of variance using a linear model, with an environmental factor, a genetic factor and interaction effect between the two factors, was fitted with genetic and interaction effects as random effects.Heritability (h2) was estimated by using VCE¬ 4.2.5 (Groeneveld, 1998) computer software. PEST-13.4.10 (Groeneveld, 1998) program was used to estimate breeding values of individual growth and milk production traits using single trait animal models. Then SAS (2003) computer package program was used to estimate correlations (genetic) of breeding values (obtained from the aforesaid mixed model analysis PEST program) between animals of two herds for the same trait.

Source of Information: J. Biosci. Agric. Res. 11(02): 955-962

Article Link (Online Journal): DOI: 10.18801/jbar.110216.117

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The RCC had almost similar performance in both production systems (intensive management system and traditional management system) and hence be considered as equally suitable breed for both situations. Considering large within population variation in the studied traits, there is opportunity of improvement for RCC if proper selection and breeding methods be applied along with optimum feeding, management and disease control measures.

Knowledge Management: Journal