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Comparative Study on Growth Patterns of 25 Commercial Strains of Korean Native Chicken
Prabuddha Manjula,Hee-Bok Park,Jaehong Yoo,Samiru Wickramasuriya,Dong-Won Seo,Nu-Ri Choi,Chong Dae Kim,Bo-Seok Kang,Ki-Seok Oh,Sea-Hwan Sohn,Jung-Min Heo,Jun-Heon Lee 한국가금학회 2016 韓國家禽學會誌 Vol.43 No.1
Prediction of growth patterns of commercial chicken strains is important. It can provide visual assessment of growth as function of time and prediction body weight (BW) at a specific age. The aim of current study is to compare the three nonlinear functions (i.e., Logistic, Gompertz, and von Betalanffy) for modeling the growth of twenty five commercial Korean native chicken (KNC) strains reared under a battery cage system until 32 weeks of age and to evaluate the three models with regard to their ability to describe the relationship between BW and age. A clear difference in growth pattern among 25 strains were observed and classified in to the groups according to their growth patterns. The highest and lowest estimated values for asymptotic body weight (C) for 3H and 5W were given by von Bertalanffy and Logistic model 4629.7 g for 2197.8 g respectively. The highest estimated parameter for maturating rate (b) was given by Logistic model 0.249 corresponds to the 2F and lowest in von Bertalanffy model 0.094 for 4Y. According to the coefficient of determination (R2) and mean square of error (MSE), Gompertz and von Bertalanffy models were suitable to describe the growth of Korean native chicken. Moreover, von Bertalannfy model was well described the most of KNC growth with biologically meaningful parameter compared to Gompertz model.
Comparative Study on Growth Patterns of 25 Commercial Strains of Korean Native Chicken
Manjula, Prabuddha,Park, Hee-Bok,Yoo, Jaehong,Wickramasuriya, Samiru,Seo, Dong-Won,Choi, Nu-Ri,Kim, Chong Dae,Kang, Bo-Seok,Oh, Ki-Seok,Sohn, Sea-Hwan,Heo, Jung-Min,Lee, Jun-Heon The Korean Society of Poultry Science 2016 韓國家禽學會誌 Vol.43 No.1
Prediction of growth patterns of commercial chicken strains is important. It can provide visual assessment of growth as function of time and prediction body weight (BW) at a specific age. The aim of current study is to compare the three nonlinear functions (i.e., Logistic, Gompertz, and von Betalanffy) for modeling the growth of twenty five commercial Korean native chicken (KNC) strains reared under a battery cage system until 32 weeks of age and to evaluate the three models with regard to their ability to describe the relationship between BW and age. A clear difference in growth pattern among 25 strains were observed and classified in to the groups according to their growth patterns. The highest and lowest estimated values for asymptotic body weight (C) for 3H and 5W were given by von Bertalanffy and Logistic model 4629.7 g for 2197.8 g respectively. The highest estimated parameter for maturating rate (b) was given by Logistic model 0.249 corresponds to the 2F and lowest in von Bertalanffy model 0.094 for 4Y. According to the coefficient of determination ($R^2$) and mean square of error (MSE), Gompertz and von Bertalanffy models were suitable to describe the growth of Korean native chicken. Moreover, von Bertalannfy model was well described the most of KNC growth with biologically meaningful parameter compared to Gompertz model.
POU class 1 homeobox 1 gene polymorphisms associated with growth traits in Korean native chicken
Manjula, Prabuddha,Choi, Nuri,Seo, Dongwon,Lee, Jun Heon Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.5
Objective: POU class 1 homeobox 1 (POU1F1) mediates growth hormone expression and activity by altering transcription, eventually resulting in growth rate variations. Therefore, we aimed to identify chicken POU1F1 polymorphisms and evaluate the association between single nucleotide polymorphisms (SNPs) and growth-related traits, and logistic growth curve parameter traits (${\alpha}$, ${\beta}$, and ${\gamma}$). Methods: Three SNPs (M_1 to M_3) were used to genotype 585 $F_1$ and 88 $F_0$ birds from five Korean native chicken lines using a polymerase chain reaction-restriction fragment length polymorphism method. Results: Single marker analyses and traits association analyses showed that M_2 was significantly associated with body weight at two weeks, weight gain from hatch to 2 weeks, and weight gain from 16 to 18 weeks (p<0.05). M_3 was significantly associated with weight gain from 14 to 16 weeks and from 16 to 18 weeks, and asymptotic body weight (${\alpha}$) (p<0.05). No traits were associated with M_1. The POU1F1 haplogroups were significantly associated with weight gain from 14 to 16 weeks (p = 0.020). Linkage disequilibrium test and Haploview analysis shown one main haploblock between M_2 and M_3 SNP. Conclusion: Thus, POU1F1 significantly affects the growth of Korean native chickens and their growth curve traits.
Prabuddha Manjula,조성현,서국진,서동원,이준헌 한국가금학회 2018 韓國家禽學會誌 Vol.45 No.4
TBC1D1 gene has known functional effects on body energy homeostasis and glucose uptake pathway in skeletal muscle tissue. This biological function is reported to have significant effects on traits of growth and meat quality in chicken. In this study, we focused on two single nucleotide polymorphisms (SNPs) (g.70179137A>G and g.70175861T>C) identified through SNP annotation information of Korean native chicken and previous literature for TBC1D1 in chicken. Association of SNPs in TBC1D1 with growth and serum clinical-chemical traits were evaluated. A total of 584 male and female birds from five Korean native chicken lines were used in the study. The SNP1 (g.70179137A>G) is located in intron 11 and SNP2 (g.70175861T>C) is a non-synonymous missense mutation in exon 10, responsible for the amino acid change from Methionine to Valine. The A allele of SNP1 and T allele of SNP2 had the highest allele frequencies. Both SNPs indicated moderate polymorphism information content values (0.25<PIC<0.5). Association results shown that SNP1 was significantly associated with BW00, BW20, GR14-16 and carcass weight (P<0.05). The AA genotype had higher value for all these traits except BW00. Whereas, genotype GG have lower values for BW20, GR14-16, GR18-20 and carcass weight. The sGOT level was significant with SNP1 but not with the SNP2. The GG genotype had the highest sGOT value and AG reported the lowest. BW20 was significantly associated with SNP2 (P<0.05). The body weight and carcass weight values of CC and TC genotypes were higher than those of TT genotype.
Manjula, Prabuddha,Cho, Sunghuyn,Suh, Kook Jin,Seo, Dongwon,Lee, Jun Heon The Korean Society of Poultry Science 2018 韓國家禽學會誌 Vol.45 No.4
TBC1D1 gene has known functional effects on body energy homeostasis and glucose uptake pathway in skeletal muscle tissue. This biological function is reported to have significant effects on traits of growth and meat quality in chicken. In this study, we focused on two single nucleotide polymorphisms (SNPs) (g.70179137A>G and g.70175861T>C) identified through SNP annotation information of Korean native chicken and previous literature for TBC1D1 in chicken. Association of SNPs in TBC1D1 with growth and serum clinical-chemical traits were evaluated. A total of 584 male and female birds from five Korean native chicken lines were used in the study. The SNP1 (g.70179137A>G) is located in intron 11 and SNP2 (g.70175861T>C) is a non-synonymous missense mutation in exon 10, responsible for the amino acid change from Methionine to Valine. The A allele of SNP1 and T allele of SNP2 had the highest allele frequencies. Both SNPs indicated moderate polymorphism information content values (0.25<PIC<0.5). Association results shown that SNP1 was significantly associated with BW00, BW20, GR14-16 and carcass weight (P<0.05). The AA genotype had higher value for all these traits except BW00. Whereas, genotype GG have lower values for BW20, GR14-16, GR18-20 and carcass weight. The sGOT level was significant with SNP1 but not with the SNP2. The GG genotype had the highest sGOT value and AG reported the lowest. BW20 was significantly associated with SNP2 (P<0.05). The body weight and carcass weight values of CC and TC genotypes were higher than those of TT genotype.
Prabuddha Manjula,Hee-Bok Park,Dongwon Seo,Nuri Choi,Shil Jin,Sung Jin Ahn,허강녕,Bo Seok Kang,이준헌 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.1
Objective: This study estimated the genetic parameters for body weight gain and growth curve parameter traits in Korean native chicken (KNC). Methods: A total of 585 F1 chickens were used along with 88 of their F0 birds. Body weights were measured every 2 weeks from hatching to 20 weeks of age to measure weight gain at 2-week intervals. For each individual, a logistic growth curve model was fitted to the longitudinal growth dataset to obtain three growth curve parameters (α, asymptotic final body weight; β, inflection point; and γ, constant scale that was proportional to the overall growth rate). Genetic parameters were estimated based on the linear-mixed model using a restricted maximum likelihood method. Results: Heritability estimates of body weight gain traits were low to high (0.057 to 0.458). Heritability estimates for α, β, and γ were 0.211±0.08, 0.249±0.09, and 0.095±0.06, respectively. Both genetic and phenotypic correlations between weight gain traits ranged from –0.527 to 0.993. Genetic and phenotypic correlation between the growth curve parameters and weight gain traits ranged from –0.968 to 0.987. Conclusion: Based on the results of this study population, we suggest that the KNC could be used for selective breeding between 6 and 8 weeks of age to enhance the overall genetic improvement of growth traits. After validation of these results in independent studies, these findings will be useful for further optimization of breeding programs for KNC.