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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 11, Issue 2 - Nov 1984
Volume 11, Issue 1 - May 1984
Selecting the target year
Identification of Limiting Amino Acids and Determination of Requirement of Total Sulfur-containing Amino Acids in a Low Protein Diet in Young Chicks.
Chee, Kew-Mahn ;
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 1~12
Since a 13% dietary protein level is generally accepted as a standard in evaluating net protein utilization values of protein sources in chicks, limiting amino acids a 13% protein basal diet containing 15% isolated soy-protein as the only source of dietary protein, were identified. Of such amino acids as methionine, lysine, threonine and tryptophan added to the basal diet singly or as a combination, methionine appeared as the only limiting amino acid for optimum growth of the chicks. When the requirement of total sulfur-containing acids (TSAA) was estimated as the point at which the dose-response curve intersected a line representing the plateau for maximum performance, the TSAA requirements for maximum growth and feed intake were 4.73% and 3.73% of dietary protein, respectively. The values, expressed in terms of TSAA intake, required for maximum weight gain, feed intake and gain/feed ratio were 167.1, 136.8 and 159.1 mg/bird/day, respectively.
Effect of Pepsin-HC
Concentration and Digestion Time on the Protein Digestibility of the Cattle Skin Meal
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 13~17
Protein digestibitlities of hydrolyzed cattle skin meals were examined at a constant pepsin-MC
concentration (0.2%) for varying lengths of incubation time (from 4 to 20 hours) and at varying concentrations of pepsin-HC
(from 0.0125 to 0.2%) for 16 hours at 45
. The results are summarized as follows: 1. Protein digestibilities of hydrolyzed cattle skin meals in 0.2% pepsin-HCl were 66.31%, 80.69%, 83.72%, 84.65% and 81.45% for 4, 8, 12, 16 and 20 hours incubation, respectively. Protein digestibilities were maintained above 80% for 8-hour incubation and were increasing incubation time. 2. Protein digestibilities of hydrolyzed cattle skin meal incubated for 16 hours at 0.2%, 0.1%, 0.05%, 0.025% and 0.0125% pepsin-HC
solution were 85.10%, 82.08%, 76.18%, 74.67% and 64.82%, respectively. Protein digestibilities were decreased with decreasing pepsin concentration.
A Bioassay on Amino Acid Availability of Various Domestic Fish Meal
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 19~25
Proximate, calcium, phosphorus and amino acid composition were determined for sardine fish meal (SM), herring fish meal (HM), anchovy fish meal (AM), alaskapolack by-product meal (ABM) and file fish by-product meal (FBM) produced domestically. These fish protein sources were fed to adult male of meat type (Waren G) broiler chicks to determine the true availability of amino acids. The true availability of essential amino acids were closely related to various fish meals with a few exceptions (e.g. valine, methionine, isoleucine and leucine). Average true availability of essential amino acids (9 amino acids) were 95, 93, 93, 91 and 91 percent for AM, SM, FBM; HM and ABM, respectively. Significant differences in the true availability of each individual amino acid were observed among fish meal tested (P＜0.01). Lysine availability was low in HM, ABM and FBM whereas phenylalanine was the lowest in FBM and ABM, respectively. AM showed the highest true amino acid availability among all fish meal tested.
Prevention of the Green-grey Discoloration in Retorted Liquid Whole Eggs
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 27~32
In order to use the liquid whole eggs as an ingredients of retorted products, the provention of the green-grey discoloration of retorted liquid whole eggs by the addition of the Na
EDTA was investigated. And palatability change of the retorted liquid whole eggs by the addition of Na
EDTA was also investigated. The results obtained were summarized as follows: 1. More severe green-grey discoloration was occurred when higher cooking temperature and longer cooking time were used. 2. Green-grey discoloration of retorted liquid whole eggs could be prevented by the addition of about 0.015% of Na
EDTA. 3. The palatability of retorted liquid whole eggs was not lowered by the addition of 0.02% of Na
EDTA and green grey discoloration was not developed during the storage time of 22 days at room temperature.
Quasi-Economic Integration in the Broiler Industry
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 33~39
The pattern of economic integration in the broiler industry can be grouped into three categories; 1) non-integration, 2) quasi-integration and 3) complete-integration. It is general to see that the non-integration is quite common under the market conditions of perfect competition, whereas the complete integration is more preferable in the imperfect competition. The quasi-integration, however, exists at all phases where the complete integration is not fully formed and implemented, but the non-integration has begun to alter its nature into integrated structure. The broiler industry in Korea has been characterized with the typically non-integrated independent operation, resulting in considerable price fluctuation and unstable industry as a whole. As a means of solving out the problem stemed from the non-integrated, growers and agribusinessmen involved in broiler industry have tended to develope the regular customer relationship prevailed between two parties. In fact, it has been practiced for years that most growers have been dealt with factor suppliers or processors on a regular basis for advantages of better price and quality, useful information, management help and so forth. Under the customary transaction, no formal contract has been made due to simple buyers and sellers relations, not like the one used to be performed in the form of contractual agreement. The broiler industry realizes the direction to go ahead toward the formal arrangement of integrated system from current regular transactions. As more Vowers, suppliers and processors recognize the necessity of it, the non-integrated industry appears to become the partially integrated by developing the existing customer relationship in such a way that functions of integrators are. further expanded and better organized. As a result, a type of quasi-integration started to show up by an integrator dominated in the field of hatching, feedmilling, dressing and by a grower's coop, It is concluded, therefore, that the evolution of quasi-integration in Korea's broiler industry is continuously taking place, implying the close approach to the completely integrated broiler production and marketing system.
Study on the Optimum Marketing Weight in Broiler
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 41~47
The study was carried out to investigate the optimum marketing weight of broiler to maximize income from broiler rasing. The change of broiler prices between 10% above or below from present base did not affect to net income ratio to income and investment efficiency. In the case of feed price was 10% down from present base, broiler farmer's income was the highest when marketed at 76 days of age, and net income was highest when marketed at 61 days of age. In the case of feed price was 10% rise from present base, broiler farmer's income was highest when marketed at 18 days of age and net income ratios to income and investment efficiency were highest when marketed broilers as 53 and 57 days of age.
A Survey on the Immune Status and Productivity of Vaccinated Poultry Flocks against Newcastle Disease in the Epizootic Area
Korean Journal of Poultry Science, volume 11, issue 1, 1984, Pages 49~64
During the 1978-79 Newcastle disease (ND) epizootic period, a detailed survey was conducted on the five representative farms which had been following one of the recommended vaccination programs. When the disease broke out during laying period, clinical symptoms were mild to moderate respiratory distress and greenish diarrhea. Affected flocks experienced weekly mortality from less than 1% to 17%. Egg production returned to normal 18 to 36 days after the initial signs appeared although some flocks never returned to normal. On postmortem examination,, most affected chickens showed severe hemorrhagic lesions in the duodenum, hematoma on ova, and heavy fat accmulation on various visceral organs. Most of the NO affected flocks had geometric mean hemagglutination inhibition antibody(HIA) titers of 7 log
or higher two to three weeks after the appearance of clinical signs. These HIA titers were at least 16-fold higher than those before infection. Flock mean HIA titers before infection were usually lower than 3 log
. Severity of clinical signs and anamnestic antibody response were maximum in the flocks whose vaccination immunity was insufficient or waned considerably. Observations showed that even young birds, if properly vaccinated, could get effective protection from field ND exposure.