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Noi chicken is one of the indigenous fighting-cock breeds of Vietnam with many valuable properties. In chicken, the Golgin subfamily B member 1 (GOLGB1) gene, which locates on chromosome 1, encodes the coat protein 1 vesicle inhibiting factor. A previous study showed that the 65-bp insertion/deletion in the GOLGB1 gene was significantly associated with chicken body weight, neck weight, abdominal fat weight, abdominal fat percentage and the yellow index b of the breast in Chinese indigenous chicken (N409-breed). In this study, 65-bp indel polymorphism in the GOLGB1gene was evaluated in association with body weight in Noi chickens. The live body weight of 170 chickens (90 females, 80 males) at continuous ages of 7-day intervals (from 28 to 84 days) was recorded. A 65-bp indel polymorphism in the GOLGB1 gene was analyzed using the PCR method. The results of PCR and sequencing revealed two alleles (I and D) corresponding to three genotypes: II, ID, DD, in which, the I allele appears with the highest frequency (0.79) in the studied population. An association study using Minitab software showed that genotype was significantly associated with body weight in Noi chickens at days 35 to 84 (P < 0.05). Individuals with more allele “I” have higher live body weight than others. Both factors (sex and genotype) simultaneously affected the body weight of Noi chickens. The results of this study suggested that the 65-bp indel in the GOLGB1 gene could be considered a potential marker for Noi chicken breeding. [ABSTRACT FROM AUTHOR]

Indigenous chicken breeds have both cultural significance and economic value since they possess unique genetic characteristics that enable them to adapt to the local environment and contribute to biodiversity, food security, and sustainable agriculture in Vietnam. To (Tò in Vietnamese) chicken, a Vietnamese indigenous chicken breed, is popularly raised in Thai Binh province; however, little known is about the genetic diversity of this breed. In this study, we sequenced the complete mitochondrial genome of To chicken for a better understanding of the diversity and origin of the breed. The results of sequencing showed that the mitochondrial genome of To chicken spans a total length of 16,784 base pairs and comprises one non-coding control region (known as the displacement-loop (D-loop) region), two ribosomal RNA genes, 13 protein-coding genes, and 22 transfer RNA genes. The phylogenetic tree analyses and estimated genetic distances based on 31 complete mitochondrial genome sequences indicated that To chicken has a close genetic distance with the Laotian native chicken breed, Lv'erwu breed in China, and Nicobari black and Kadaknath breeds in India. The result of the current study might be important for conservation, breeding, and further genetic studies of To chicken. [ABSTRACT FROM AUTHOR]

Chicken growth performance is an important economic trait, so finding the growth curve is essential for the chicken industry including indigenous chicken. Vietnam has many different native chicken breeds and Ri is one of the most famous native chickens. The objective of this study was to find out the best model to estimate the growth of Ri chicken. The body weight of 358 Ri chicken was measured every week until week 20 of age and growth data was analyzed in R using six mathematical functions (Bertalanffy, Bridges, Janoschek, Gompertz, Logistic, and Richards). The results showed that the best models to describe the growth of Ri males and females were Gompertz and Bridges, respectively. The upper asymptotic body weight (a) was estimated for males from 2,130 g (Logistic) to 2,600 g (Bertalanffy), whereas this a value for females was from 1,500 g (Logistic) and 1,816 g (Bertalanffy). Age at the start of the growth acceleration phase was estimated from 2.80 to 3.90 weeks for males and from 2.00 to 3.30 weeks for females. The inflection point for males (7.54 to 9.72 weeks of age) was higher than for females (7.10 to 9.43 weeks of age). Age at the end of the growth deceleration phase was estimated from 16.65 to 24.80 weeks for males and from 12.70 to 25.15 weeks for females. In conclusion, the best model for reporting the Ri chickens' growth curve was the Gompertz for males and Bridges for females. [ABSTRACT FROM AUTHOR]