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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Poultry Science
Journal Basic Information
Journal DOI :
The Korean Society of Poultry Science
Editor in Chief :
Volume & Issues
Volume 7, Issue 2 - Nov 1980
Volume 7, Issue 1 - Apr 1980
Selecting the target year
Relationship Between Egg Shell Quality and Shell Breakage and Factors that Affect Shell Breakage
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 1~11
About 6 to 8% of the eggs annually produced are broken or cracked between the hen and the consumer's carton. The majority of this breakage is due to interrelationships between egg shell quality and the many biological, environmental and managerial factors which have been individually identified as affecting breakage. Some of the factors associated with shell damage discussed in this review include age of hens, temperature ana humidity of the laying house, design of the cage systems and of the cage floors, type of material used to manufacture the cages frequency of daily egg collection in the laying house and, Probably most important, the frequency and quality of handling equipment maintenance. Age and genetic constitution of the hens, environmental temperature, and design and quality of equipment maintenance are the major factors that influence shell breakage. There is a curvilinear relationship between shell quality and shell breakage which explains why small changes in shell quality may be associated with large changes in the incidence of breakage. Published data indicate the incidence of breakage may range from as low as 1 to 2% to 35% or more for other egg producers.
Egg Futures Trading
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 13~22
On the Chicago Meracntile Exchange, individuals and firms buy and sell contracts for specified amounts of products that are to be delivered at a time period in the future at a price arrived at through openly competitive bidding. The transfer of ownership of these delivery promises takes place in a particular trading pit, for each commodity, on the floor of the Exchange. Trades are officially made by qualified members of the Exchange who act as brokers for their customers. For his services, the broker is paid a nominal round- turn commission fee by the customer. Although each commodity contract carefully describes the particular standards that product must meet in order to be a acceptable for delivery, actually fewer than three percent of the contracts traded are consummated by delivery. For the most part, contract obligations ions art offset, and thereby liquids. before the termination of the delivery month. The trader liquidates his position in the market after analyzing price trends, his timing, and his calculated price objectives. (omitted)
A Study on the Utilization of Soy-Lecithin in Broiler Ration
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 23~29
The research was conducted to study the feeding value of crude soylecithin produced as by-products of soybean oil manufacturing in broiler ration. The results obtained were as follows. 1. The chemical composition, mineral composition, Vitamine contents and gross energy values of crude soy-lecithin were determined 2. No significant difference was observed for the body weight gain of broiler between control and lecithin groups of 3%, 6%, 9o/e and 12% addition. 3. Significant difference (P＜0.05) was observed for feed intake lecithin 12% composed with lecithin 6% and 9% group, However, no significant difference was found among control, lecithin 3%, 6%, and 9% groups. 4. No significant difference was found for feed conversion between treatments. However, the lowest figure 2.32 for lecithin 9% treatments, followed by 2.40 of lecithin 6% and 2.41 of lecithin 3% orderly. 5. The composition of moisture, crude protein and ether extract in broiler carcas ranged from 71.2 to 72.15%, from 15.93 to 16.45% and from 6.19 to 7.05% respectively. 6. The weight of abdominal fat and live fat in broiler caress ranged from 42.4 to 63.7 gm, and from 2.2 to 2.4gm respectively. difference between abdominal and live fat weight was showing in significant statistically. 7. The present data reveal that soy-lecithin as by-product of soybean oil manufacturing was valuable energy source.
A Study on Effects of Breeding Combination for Feeding and Economic Analysis in Broiler Stock
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 31~42
In order to identify the best superior cross combination of breeder stocks for broiler production, combining ability test and analyses of phenotypic performances for parent stocks were examined on records of 1,440 broiler chicken which were produced from 4 parental strains and 3 maternal strains at Hanhyup Poultry Breeding Farm from September 28, 1978 to January 5, 1979. The results obtained were as follows; 1. There was not found heterosis effect in viability but it seems to be desirable to select Hubbard strain in paternal line to improve viability. 2. As the paternal and maternal lines, selection of Ross strain showed the best paternal and maternal performance and the best general combining ability in body weight at 8 weeks of age is expected to be able to improve body weight of it s crossbred And the most superior cross combinations based on the specific combining ability and performance of rack crossbred were identified as Hubbard x Ross ana Ross x Hypeco crossbreds. 3. The best paternal and maternal lines on the smallest feed consumption for 8 weeks were Hubbard and Ross strains, and Hypeco strain, respectively. Especially Hubbard x Hypeco cross combination was proved as the smallest feed consumption compared with other cross combinations. 4. In feed requirement per Kg body weight increase, Hubbard strain for paternal line, Hypeco strain for naternal line, and cross combinations of Hubbard x Hypeco, Hubbard x Ross and Ross x Hypeco were certified as the most superiors. 5. Also superior cross combinations of Hubbard x Hypeco and Hubbard x Ross earned the most profit per bird through economic analysis. According to results as shown above, this experiment seems to be able to reach a such conclusion that production of superior cross combinations Hubbard x Ross, Hubbard x Hypeco and Ross x Hypeco through selection of Ross and Hubbard strains to paternal line and Hypeco and Ross strains for maternal line may become to considerable improvement for important economic characters of broiler; viability, body weight, feed consumption and feed requirement.
Survey on the Change of Sex Ratio with the Age of Pullets in Chicken
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 43~51
This study was carried out to investigate reasonable Period of egg production for incubation and to survey the change of sex ratio with the age as the preliminary work to make breed which can produce progeny in controlled sex ratio. The analyzed data was obtained from the record of incubations during 165-262 hys of age in White Leghorn. The results can be summarized as follows: 1. It was appeared that the fertility and hatchability were increased with the egg produced over 7 months of age. 2. It was tendency that the fertility and hatchability of the flock produced a more female chicken (40% flock) were higher than those of flock produced a more male chicken (60% flock). 3. The variation of sex ratio with the age was wider in 60% flock than in 40% flock 4. 60% flock showed heavier egg weight and body weight, in a while, 40% flock better sexual maturity and hen- housed egg production. 5. There was a negative correlation between sex ratio and henhoused egg production in 60% flock, but 40% flock appeared a positive correlation.
Isolation of the Pathogenic Bacteria from Chicken and Antimicrobial Drug Sensitivity of the Strain Isolated
Korean Journal of Poultry Science, volume 7, issue 1, 1980, Pages 53~64
A total of 1503 specimens were submitted to the Poultry Disease Diagnostic Service Laboratory during the year 1966 and 1978. The most frequently diagnosed diseases in order of prevalence were avian mycoplasmosis, staphylococcosis, colibacillosis, salmonellosis and pullorum disease, the percentages of the conditions being 24.6%, 20.0%, 18.0%, 12.6% and 6.4%, respectively, The drug resistance of pathogenic mirnoorganisms isolated during the year 1978 from chicken with colicabacillosis, staphylococcosis or salmonellosis were investigated by the use of disc diffusion technique, the results being as follow. 1) Drug resistance of 63 strains of Escherichia coli More than 95% of the strains tested were sensitive to colistin and gentamicin. The percentages of strains sensitive to kanamycin, chloramphenicol, ampicillin and nitrofurantoin were 66.7%, 60.3%, 60.3% and 47.6%, respectively. Majority of the strains were highly resistant to streptomycin and tetracyline. All the strains were resisistant to bacitracin lincomycin, oleandomycin, penicillin and erythromycin. All the strains tested were resistant to more than two among 10 drugs in common use such as penicillin, erythromycin, streptomycin, tetracycline, neomycin, chloramphenicol, kanamycin, ampicillin and gentamicin, and 27 different resistance patterns were noted. The most frequent multiple resistance pattern was PC, EM, SM and TC (11.1%). 2) Drug resistance of 48 strains of Salmonella More than 95% of the strains tested were sensitive to colistin, gentamicin ana ampicillin. The percentages of st rains sensitive to kanamycin, tetracycline, neomycin and nitrofurantoin were 81,3%, 79%, 72.9%, and 68.0% respectively. None of them was sensitive to streptomycin, oleandomycin, erythromycin, lincomycin and bacitracin. All the strains were resistant to more than one among 7 drugs in common use such as streptomycin, erythromycin, neomycin, tetracycline, kanamycin, ampicillin and gentamicin. The most frequent resistance pattern was SM and EM(66.7%). 3) Drug resistance of 54 strains of Staphylococci All the strains tested were sensitive to gentmaicin, kanamycin and cephalothin. Majority of them were highly sensitive to bacitracin, methicillin, nitrofurantoin and chloramphenicol. The Percentages of strains sensitive to streptomycin, ampicillin, lincomycin and tetracycline were 66.7%, 55.6%, 44.4% and 27.8%, respectively. Among them, 51 strains were resistant to more than one among 11 drugs in common use such as tetracycline, lincomycin, ampicillin, penicillin, streptomycin, erythromycin, neomycin, oleandomycin, chloramphenicol, methicillin and bacitracin, and thirty one different resistance patterns were noted.