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• Assessment of Genetic Diversity ofLac Son Chicken using Microsatellite Markers

  Ngo Thi Kim Cuc, Nguyen Van Ba

  Received: 08-04-2019 / Accepted: 22-04-2019

   Abstract PDF (VIETNAMESE)

  The objective of this study was to assess genetic diversity and genetic differentiationbetween Lạc Sơn chicken and other native chicken breeds using 20 microsatellite markers. The resultsindicated that microsatellite markers studied werepolymophic with an average of 6.73 alleles/locus. The genetic diversity of Lạc Sơn chicken was on theaverage level with the expected heterozygosity of 0.60 and the number of alleles/locus was 6.05.The inbreeding coefficient of Lac Son chicken was very low. The lowestgenetic distance was found between Lạc Sơn chicken and Đông Tảo chicken but the highestgenetic distance was found between Lạc Sơn chicken and Tai đỏ chicken.Sub-structuring of the Vietnamese chicken breeds was related to their geographical distributiondistance. Three chicken breeds, viz. Ri, Đong TaoandMia,in the Red River Delta were in the same group, while Lac Son chicken in the northern central region was seperatedand different from Tai Đỏ chicken (Red Jungle Fowl) breed.

• Evaluation of 24-bp Insertion-Deletion and C2402T Polymorphisms of the Prolactin Gene in Two Vietnamese Native Chickens: Riand Mia Chicken

  Nguyen Hoang Thinh, Nguyen Thi Chau Giang

  Received: 01-03-2018 / Accepted: 20-06-2018

   Abstract PDF (VIETNAMESE)

  The Vietnamese native chickens have low egg production so they is difficult to breeding andtheir population is declining.Polymorphisms (24-bp Insertion-Deletetion và C2402T) of Prolactin geneis usually considered as candidate genes in the genetic analysis for the improved performance traits in poultry. The study was conducted to determine two SNPs polymorphisms (24-bp Insertion-Deletetion and C2402T) of Prolactin gene in two Vietnamese native breeds Ri and Mia chicken.For genotyping of individual was identified by PCR and PCR-RFLP methods. The results showed that the individual’s genotype was identified in two Riand Mia chicken breed. For 24-bp Insertion-Deletetion polymorphism, the II genotype in Ri chicken and Mia chicken present at low frequencies, (0.07) whereas for DD genotypes in Ri and Mia chickens occur at high frequencies, 0.68 and 0.82, respectively. For C2402T polymorphism, the study shown that two breeds (Ri and Mia) had the highest TT genotypes, respectively 0.64 and 0.84; The CC genotype in both Ri and Mia chickens appeared at low frequencies of 0.08 and 0.07, respectively.

• ExternalCharacteristicsand Reproductive Performance of Bang Troi Chicken

  Nguyen Hoang Thinh, Nguyen Thi Vinh, Phan Thanh Lam, Mai Thi Thanh Nga, Bui Huu Doan

  Received: 02-07-2020 / Accepted: 12-09-2020

   Abstract PDF (VIETNAMESE)

  The Bang Troi chicken is one of the Vietnamese native chicken breeds, which is raised mainly in Hoang Bo district, Quang Ninh province. The study was conducted to determine external characteristics and reproductive performance of Bang Troi chicken. In experiment 1, 400 chicks from newborn to 20 weeks of age were raised to record the appearance characteristics and some dimensions of Bang Troi chicken. In experiment 2, 171 chickens from 21 to 74 weeks of age were raised to assess their reproductive performances. Results showed that 1 day-old chicks had 71% with pale yellow feathers, 29% darker yellow brown; at 20 weeks of age, 20% of males had yellow mixed with black, 65% of yellow wings account and 15% of yellow apricot flowers; 65% hens had gray feathers, 15% yellow and 20% apricot, 87% single crested, 13% bud crested; Bang Troi chicken legs were small and short, 92% yellow legs, 8% lead legs. At 20 weeks of age, Bang Troi chicken had an average back length of 19.44cm; the breast length was 12.96cm; the wing length was 19.44cm; thigh length was 10.24cm and shin was 4.76cm. The body weight at laying rate of 5% was 1.69kg; peak production was 2.25kg. Egg yield at 74 weeks of age reached 97.87 eggs; the average farrowing rate was 26.38%; The average egg weight was 48.43g. The rate of egg embryos was 94.83%.

• Reproductive Performance and Egg Quality of F1(Dong Tao x Luong Phuong) Crossbred Chickenand Dong Tao Native Chicken Breed

  Nguyen Van Duy, Nguyen Dinh Tien, Nguyen Chi Thanh, Vu Dinh Ton

  Received: 13-04-2020 / Accepted: 04-05-2020

   Abstract PDF (VIETNAMESE)

  This study was carried on15 henDong Tao (ĐT) chicken and 15 hens F1 crossbred Dong Tao breed with Luong Phuong(LP)breed to evaluate the reproductive performance, feedconsumption to ten eggs, egg quality and fertility, hatchingduring 38 laying weeks. These hens were raised individually in battery cage and inseminated artificially. The egg weight and external egg quality were measured on 750 eggs from ĐThens and 1150 eggs from F1(ĐTxLP) hens. The hatching rates in both breeds were collected from 22 incubator runsfor each breed.The reproductive performance of F1(ĐTxLP) henswasbetter than that of ĐT hens.The laying percentage during 38 laying weeks averaged 40.29% forF1(ĐTxLP)hens, 17,98% higher than ĐThens. The total number of eggs laid during 38 laying weeks averaged 107.18 for F1(ĐTxLP) hens and 59.33 eggs for ĐThens. The FCR per 10 eggs ofF1(Dong Tao x Luong Phuong) hens was significantly lower than which calculated on Dong Tao chickens (P<0.001). The chicks malformationpercentage of F1hens (ĐTxLP)was 0.24% lower than thatof Dong Tao hens (1.26%)(P<0.05). The Luong Phuong chickenbreed can be usedto cross with Dong Tao to improve the exploitation and development genetic resources of Dong Tao chicken

• Characteristics of Seroprevalence of Antibodies Against Avian Metapneumovirusin Chickens in some Northern Provinces

  Huynh Thi My Le, Le Ba Hiep, Nguyen Van Giap, Nguyen Thanh Trung, Truong Ha Thai, Chu Thi Thanh Huong, Dang Huu Anh, Mai Thi Ngan, Tran Thi Huong Giang, Le Van Truong, Vu Thi Ngoc, Cao Thi Bich Phuong

  Received: 17-04-2023 / Accepted: 29-08-2023

   Abstract PDF (VIETNAMESE)

  Avian metapneumovirus(aMPV) is a newly recognized respiratory pathogen in Vietnam but has currently received less interest from veterinary scientists. In continuation of the previous published studies, this study aimed to describe some characteristics of seroprevalence of antibodies against Avian metapneumovirus according to flock size, infected breeds, and variation of antibody titers between age- groups. The indirect ELISA technique detected the presence of specific antibodies against aMPV in 130/359 samples (36.2%) randomly collected from 29 chicken farms (without history of using vaccine against aMPV) in 10 provinces in northern Vietnam. Chickens belonging to all flock sizes had specific aMPV antibodies ranging from 24.8%-63.2%. Meat type birds of many breeds had natural antibodies against aMPV of 8.2% for broiler chickens, 35.0% for hybrid chickens and 48.8% for native chickens. Of the sero-positive sera, the antibody titers against aMPV of chickens from 4 age-groups were variable in a relatively wide range, from 102.6to 104.2.

• Growth Performance, Carcass Yield, and Meat Quality of Tien Yen Chicken Fed on Self-mixed Diets from 13 Weeksof Age to Slaughter

  Nguyen Van Duy, Nguyen Dinh Tien, Vu Quynh Huong, Nguyen Thi Nga, Bui Thi Kim Oanh, Vu Dinh Ton

  Received: 20-07-2022 / Accepted: 27-03-2023

   Abstract PDF (VIETNAMESE)

  This study aimed to evaluate the effect of different diets on growth performance, carcass yield, and meat quality of Tien Yenhens andcastrated cocks. The control diet (NH) used feed mixed from corn, rice bran and industrial compound feed. Diet 1 (CT1) was formulated from 11 ingredients (corn, soybean meal, barley bran, rice bran, limestone powder (CaCO3),salt,dicalcium phosphate (DCP), mineral premix, methionine, lysine, and threonine). Diet 2 (CT2) comprised of7 ingredients as indicated in CT1except DCP, methionine, lysine, and threonine. The results showed that CT1 and CT2 improved the growth performance by10.26%and4.32%, respectively,for castrated cocks, and by 6.74%and 5.61%, respectively,for hens compared toNH. Using CT1 and CT2 reduced abdominal fatby 53.79%and 44.51%,respectively,for castrated cocks, and by 44.63%and 21.78%, respectively,for hen compared with the control group. Further research should be conductedto decrease the number of days toslaughter and reduce the abdominal fat of Tien Yen broiler.