肉用種鷄의 育種開發을 위한 交雜試驗 : I. Selection of Superior Stock in Female Line Ⅰ.母系統 優良 交配 組合 選拔試驗 = A Study on Crossbreeding of Broiler Production in Poultry
저자
발행기관
서울大學校 農科大學(College of Agriculture Seoul National University)
학술지명
권호사항
발행연도
1977
작성언어
Korean
KDC
520.5
자료형태
학술저널
수록면
147-171(25쪽)
제공처
소장기관
A Study on crossbreeding of Broiler Production in Poultry
This study was carried out to improve broiler production and to estimate a genetic value and to select superior broiler breeder stock by means of crossbreeding under domestic feeding and management conditions.
1. Selection of superior stock in females.
The data used in this study were the rocords of two selected superior breeder stocks, one strain of domestic superior broiler parent stock and added one strain of imported parent stock. A total of 1,020 chicks of parent stock were used in this experiment. The results obtained in this study are summarzed as follows; (1) The average viability of brooding period was 95.20% and the highest viability was A strain (98.85%), and lowest viability was D strain. There was significant difference between A and D strains. The death of the chicks was due mainly to paralysis and catarrh of crop.
(2) The average viability of growing period was no singificant difference between experimental strains.
(3) With respect to the laying hen viability, the average viability was 92.71%and the highest viabllity was 96.55% in C strain, and the lowest viability were 91% in A and D strains. The death of the laying hens was due mainly to Lymphoid Leukosis Complex in D strain,
(4) The average body weight at 6 weeks of age was 953g and the highest body weight was 986g in D strain, and the lowest body weight was C strain (936g). The D strain was superior to the other strains in the body weight at 6 weeks of age and there was significant difference between D and others strains.
(5) The average feed conversion at 6 weeks of age was 2.11kg and the highest feed effeciency was A strain (2.06kg). The A strain was improved feed efficiency about 0.1kg compared with D strains.
(6) The growth rate of growing period was normally developed comparing with breeder pullet mean body weight and feed recommendations. There was no significant difference between experimental strains.
(7) The average body weight at 24weeks of age was 2,775g and this body weight was slightly overweighed compared with recommended feeding standard, however there was no signifiicant difference between strains.
(8) The average adult body weight at 58 weeks of age was 3,356g and highest body weight was 3,416g in D strain, and the lowest body weight was 3,296g in A strain. The adult body weight of laying period was normally maintained compared with breeder pullet feeding recommend-ations.
(9) The average date of sexual maturity was 179days and the earlist sexual maturity was 176days in D strain and the latest sexual maturity was 183 days in C strain.
(10) The average hen-day egg production from 24 to 58 weeks of age was 62% and the high-est egg production strain was A strain (66%), and the lowest egg production was D strain (60%). The A strain was about 6% higher than the imported parent stock (D strain). The hen-housed average egg production was 145 eggs and the A strain had about 11 egg higher egg production than the D strain. In statistical analysis for egg production, there was significant difference between A strain and the other strains.
(11) In egg weight, the average egg weight was 61g and the highest egg weight was D strain-(62.7g) and the lowest egg weight strain was A strain (60g). It seems to be important to improve egg weight in domestic strains.
(12) The average conversion of feed into egg production was 219.8g and the lowest feed requirement strain was A strain(206.6g), and the highest feed requirement strain was C strain(227.3g). It seems to be important in economic point and A strain was superior to the imported parent stock (D strain).
(13) In economic analysis of broiler breeder stock, the average net income per layer was 2,661 won and the highest net income was A strain (2,919won) and the lowest net income was imported parent stock (2,402won). With respect to the cost of per egg production, the average egg production cost was 29 won and the lowest production cost was A strain(27.52won). Egg production cost of D strain which was imported broiler breeder stick was 30.29won and the D strain needed more cost 2.77won to produce per egg compared with the A strain.
(14) Average fertility of selected superior stock in female lihe was 98.3% and the lowest fertility was B strain (97.9%). The average of hatchability was 93.8% and the highest hatchability was (B ×Y) crossbreds (96.3%) and the lowest hatchability was(B ×X) crossbred(93.6%) and imported parent stock (90.2%).
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