Rahman et al. (2016) / J. Biosci. Agric. Res. 11(02): 955-962 DOI: 10.18801/jbar.110216.117 955 Published with open access at journalbinet.com EISSN: 2312-7945, © Rahman et al. (2016), Research paper Genotype and environmental interaction in growth and milk yield traits of indigenous Red Chittagong cattle Farzana Rahman, Md. Parvej Alam, Md. Azharul Hoque and A. K. Fazlul Haque Bhuiyan Dept. of Animal Breeding and Genetics, Faculty of Animal husbandry, Bangladesh Agricultural University, Mymensingh-2202 ✉ For any information: ask.author@journalbinet.com, Available online: 25 December 2016. ABSTRACT 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) where as traits with negative correlation values indicate that RCC parents should be selected and used separately in two production environments. Key Words: Red Chittagong Cattle, Growth, Milk yield and G x E interaction I. Introduction Bangladesh is an agricultural based country in which livestock contributed 2.67% to the GDP (Bangladesh Economic Review, 2014-2015). The need of per capita meat and milk is 120 g and 250 ml per day, respectively, whereas per capita availability is only 65.03 g and 91.03 ml per day (MoFL, 2013). This illustrates how urgent is the need to increase the production of milk and meat. More than 80% of rural people keep 90% local cattle in Bangladesh and according to Bag (2010) among the different types of local cattle, the RCC is one of the most potential and promising type of Farm Animal Genetic Resource (FAnGR) that are more adaptable in our agro-climate condition for improvement of Published with Open Access at Journal BiNET Vol. 11, Issue 02: 955-962 Journal of Bioscience and Agriculture Research Journal Home: www.journalbinet.com/jbar-journal.html Cite article: Rahman, F., Alam, M. P., Hoque, M. A. & Bhuiyan, A. K. F. H. (2016). Genotype x environment interaction in growth and milk yield traits of indigenous Red Chittagong cattle. Journal of Bioscience and Agriculture Research, 11(02), 955-962. Article distributed under terms of a Creative Common Attribution 4.0 International License.