Genetic Evaluation Of Bangladesh Livestock Research Institute Cattle Breed-1 : Heritability And Genetic Correlation

Abstract

Heritability and genetic correlation of economic traits of Bangladesh Livestock Research Institute (BLRI) Cattle Breed-1 (BCB-1) were estimated with Residual Maximum Likelihood (REML) principle. The BCB-1 is a native cattle breed developed by BLRI through selective breeding among indigenous cattle of Bangladesh. Data asserted from performance record sheets of 500 animals maintained during 1992 to 2005 were analyzed for estimation of genetic parameters. The heritabilities were estimated with single trait animal model for age at service and age at first calving and those of single trait repeatability model for other traits. However, two traits animal models were used for estimation of genetic correlations among different traits. The model includes sex, season and year of birth, parity, generation and additive genetic merit of each individual. The estimated heritabilities were higher for lactation milk yield (LMY, 0.404) and age at first calving (AFC, 0.404) followed by moderate estimates of daily milk yield (DMY, 0.257), lactation length (LL, 0.333), peak milk yield (PMY, 0.335), milk yield per day of calving interval (MYCI, 0.227), age at first service (AFS, 0.316), calving interval (CI, 0.273), and post partum heat period (PPHP, 0.276). The genetic correlations of lactation milk yield were high with DMY (+0.797), LL (+0.797) and MYCI (+0.876), moderate with CI (+0.399), PPHP (+0.205) and DP (-0.404) and low with AFS (-0.048) and AFC (-0.025). The moderate to high heritabilities for along with high genetic correlations among most of the milk yield traits emphasized continuation of selective breeding program for maximization of genetic improvement of this breed. The information generated in the present study may also be used in planning breeding program for other indigenous cattle germplasm of the country.

Variance components using genomic information for 2 functional traits in Italian Simmental cattle: Calving interval and lactation persistency

“…The magnitude of the estimates obtained in the present study is not far from previous reports of about 0.5-0.6 (Pryce et al, 2000;Dal Zotto et al, 2007;Fu et al, 2017). Deb et al (2008) reported a genetic correlation of 0.4 between CI and MY in a native breed from Bangladesh. Antagonistic genetic correlation between MY and CI was also observed by Haile-Mariam et al (2003) and by Strapáková et al (2016).…”

Genetic evaluation of reproductive traits in Jersey crossbred heifersat an organized farm of eastern India

“…The genetic (r g = 0.81) and phenotypic correlation (r p = 0.75) estimates between age at first service and age at first calving observed were positive and strong (Table 4) that was as expected from close link between their measurements and were quite similar to finding reported by Deb et al, 2008 in crossbred cattle. The result of this study were also consistent with the earlier studies of Saha, 2001 (r g = 0.55, r p = 0.85) and Haile et al, 2009 (r g = 0.88, r p = 0.73) in Karan Fries and Boran crossbred cattle respectively.…”

Genomic Tools and Genetic Improvement of Crossbred Friesian Cattle

“…Estimation of heritability and genetic correlation of economic traits will help in planning further genetic improvement programme of any breed. Accordingly, heritability of production and reproduction traits such as lactation milk yield, lactation length, peak milk yield, dry period, age at first service, age at first calving, post-partum onset of heat, services per conception and calving interval (Aaron et al, 1987, Deb et al, 2008, Verma et al, 2018. Moreover, genetic parameters of Holstein crossbred cows were evaluated in commercial dairy farms in Bangladesh .…”