Brief information of PHD thesis: Selection and pure breeding of two egg-oriented D629 and D523 chicken lines

Objectives of the study: Selecting and improving the egg yield of the D629 rooster line; selecting and improving the egg weight of the D523 hen line; evaluating the production ability of commercial crossbred chickens created between D629 rooster line and D523 hen line.
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Brief information of PHD thesis: Selection and pure breeding of two egg-oriented D629 and D523 chicken lines MINISTRY OF EDUCATION AND MINISTRY OF AGRICULTURE AND TRAINING RURAL DEVELOPMENT NATIONAL INSTITUTE OF ANIMAL SCIENCE PHAM THUY LINH SELECTION AND PURE BREEDING OF TWO EGG-ORIENTED D629 AND D523 CHICKEN LINES Major : Animal Genetics and Breeding Code number : 9 62 01 08 BRIEF INFORMATION OF PhD THESIS Ha Noi-2021 The work was completed at National institute of animal science Supervisors: Doctor. Nguyen Quy Khiem Assoc Prof. Doctor. Nguyen Huy Dat Reviewer 1: Prof. Doctor. Nguyen Duy Hoan Reviewer 2: Assoc Prof. Doctor. Do Vo Anh Khoa Reviewer 3: Doctor. Ngo Thi Kim Cuc The dissertation will be defended at the National thesis council at: National institute of animal sciences, Time: …h date ….. Month …… year of 20.... The dissertation can be found at: - National library - Library of NIAS INTRODUCTION 1. Problem Statement In order to achieve the strategic goals of livestock development and adaptive production system. In the past, our country has had access to high-yielding poultry genetic resources in the world, conducted selection and breeding and developed some exotic chicken breeds. At the same time, some high-productivity chicken lines, with oriented-eggs, has been selection and breeding. Imported chicken breeds, which have high egg production,have been developed such as: Leghorn white, ISA brown, Brown nick, Goldline 54, Moravia, Hisex whiter, Hyline, etc. From exotic genetic resources, some authors have selected, crossbreeding (using the method of selection based on phenotypic value) to create lines for domestic production such as research Nguyen Huy Dat (1991) white Leghorn chickens; Phung Duc Tien et al. (2012) two chicken lines HA1 and HA2, Nguyen Quy Khiem et cs. (2016) four lines of GT chickens,… In 2016, The framework of the bilateral cooperation program between Vietnam and the Czech Republic to development of Czech egg-oriented chickens in Vietnam have been selected and imported two lines of egg-oriented chickens, the white feathered D629 line and brown feathered D523 series from DOMINANT CZ. These are two purebred chicken lines with high egg production, good egg quality, and the yolk ratio of egg has around 28-30%, which is 2-3% higher than other high-yielding chicken line. According to the company's documents, egg yield/hen/68weeks of age and egg weight of line D629 reached 269.81 eggs and 59.90g, and line D523 reached 258.37 eggs and 61.50g. Through studies on imported chicken breeds in our country, especially purebred lines, both egg yield and weight of these two lines have not been achieved as announced by the company. Thus, in order to effectively exploit the reproductive performance traits and develop the precious genetic resources of these two chicken lines in Vietnam, it is necessary to continue to select and purebred breed to maximize the genetic potential of the yield traits. At the same time, creating a hybrid between two lines with high egg yield and quality, eggshell color suitable to consumer’s tastes. Therefore, the study Selection and pure breeding of two egg- oriented chicken lines D629 and D523 was selected as the thesis topic. 2. Objectives of the study - Selecting and improving the egg yield of the D629 rooster line. - Selecting and improving the egg weight of the D523 hen line. - Evaluating the production ability of commercial crossbred chickens created between D629 rooster line and D523 hen line. 3. Scientific and practical significance of the study 1 3.1. Scientific meanings - Successfully selected the D629 male line with high egg yield; D523 female line had high egg weight. From two egg-oriented D629 and D523 chicken lines, commercial hybrid chicken had been created with heterosisin egg production. - The research results of the topic are a valuable scientific basis for the research on selection and breeding of livestock, as well as a valuable scientific document for teaching, learning, research at training institutions, poultry breeding establishments in general and egg-oriented chickens in particular. 3.2. Practical significance - The research results of the thesis opened the possibility of application from two egg-oriented chicken lines (D629 rooster line and D523 hen line) to produce commercial chickens with high yield egg, good egg quality and high yolk ratio, especially the eggshell with pink-white color, suitable to consumer’s tastes, contributing to providing a valuable food source for the society. - Enrich the genetic resources of our country's egg-oriented chicken breeds. 4. New contributions of the dissertation - The research results of the thesis have contributed to perfecting the method of selecting egg-oriented chicken breeds in our country based on breed value estimated by BLUP, have determined the genetic parameters analyzed by statistical model through the software PEST and VCE, have brought high efficiency in breed selection; - On the basis of the estimated breed value on egg yield trait at 38 weeks of age for D629 rooster and egg weight 38 weeks old for D523 hen, has selected a breed of D629 rooster with high egg yield, reaching 263.87 eggs/hen/68 weeks of age, increasing 11.28 eggs compared to the starting generation and a breed of D523 hen with high egg weight, reaching 64.14g; increasing 2.27g compared to the starting generation; - From 2 chicken lines D629 and D523, a commercial hybrid chicken DTP1 was created, with an outstanding hybrid advantage in egg yield of 4.22%. Eggs had goo ...