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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Poultry Science
Journal Basic Information
Journal DOI :
The Korean Society of Poultry Science
Editor in Chief :
Volume & Issues
Volume 14, Issue 2 - Nov 1987
Volume 14, Issue 1 - May 1987
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Effects of Dietary Protein and Energy Levels on Egg Production and Egg Weight of Laying Hens
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 1~8
Three experiments were conducted to investigate effects of dietary energy and protein levels on performance of laying hens. A total of 360 hens each of 352-day old Manina Brown (Exp.1), 280-day old Brown Warren (Exp.2) or 3174ay old Brown Warren (Exp.3) was divided into 20 pens of 18 birds. Each pen was assigned to one of the four dietary treatments with 5 replications according to a 2
2 factorial design, consisting of all possible cominations of two levels of metabolizable energy (2,500 and 2,800 kcal/kg of diet) and two levels of crude Protein (13 and 16%). All hens were housed two birds per cage. Exp.1 and 2 were conducted for four weeks and hens were fed experimental diets ad libitum, and Exp.3 lasted two weeks and feed consumption was restricted to 130g/hen/day. In Exp.1 and 2, increasing either energy or protein level in the diet numberically improved egg production. However, in Exp. 3, where feed consumption was restricted, egg Production was affected significantly 〈0.05) by the energy levies and numerically by the protein levels. Neither protein nor energy level influenced egg weight in Exp. 1 and 2, but in Exp. 3 the higher level of energy improved egg weight numerically, In all three experiments increasing either protein or energy level increased egg mass. Higher levels of either protein and energy tended to decrease feed consumption and improve feed conversion rate numerically. It should also be noted that the higher level of energy improved egg mass produced per unit intake of protein and the higher level of Protein improved egg mass produced per unit intake of energy.
The Effect of Dietary Fiber Levels on the Size of Brolier′s Gut and Chromium Turnover Time in Each Segment
K. H. Nahm ; C. W. Carlson ;
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 9~13
Three-week-old, broiler-type, mixed sex chicks were divided into replicate groups of 10 birds each and fed for 5 weeks. The wheat bran was defatted and added at 0, 10 and 20% levels. A fourth group received the 20% wheat bran plus a cellulase enzyme added at the level of 0.008%. After a five-week experimental period without a marker a 24-pen battery on the four diets were supplemented with 1% chromic oxide and fed 100g daily. After a 2-day preliminary period, feces were collected three times daily from each diet group for two days at 2, 4 or 8 hours after feeding. At the end of 4 days, within each diet group, birds were randomly selected for slaughter at 2, 4 or 8 hours after feeding and the entire gastrointestinal tract was removed and ligated to form five compartments. The lengths of each segment were measured after straightening, and the gizzard was emptied and weighed. The summarized data showed that the group fed on the high-energy basal diet had the lowest gizzard weight (P〈0.05). Chromium turnover time (minutes) in the each segment and entire GI tract of chicks was not influenced by the high fiber diet or cellulase.
Effects of Different Protein Levels and Time of Change from Starter to Finisher Ration on the Performance of Broilers
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 15~24
A total of 216 day-old broiler chickens were randomly assigned to 6 treatment combined 2 dietary protein regimens (22-20%, 20-18% for starter and finisher, respectively) with 3 times of change (2, 4, 6 weeks) to study the effects of different protein levels and time of change from starter to finisher ration on the performance of broilers. Increasing the dietary protein level resulted in not only a significant increase in the body weight gain and the protein requirement per kg body weight gain, but also an improvement of feed efficiency. However abdominal fat accumulation was decreased by adding incremental levels of protein. On the other hand, the earlier time of change from starter to finisher ration, less\ulcorner\ulcornerbody weight gain and the abdominal fat accumulation. But feed intake and viability were not affected by the dietary protein level and/or the time of change from starter to finisher ration. Income was highest for birds fed 22% and 20% protein diet' starter and finisher, respectively changed from starter to finisher at 4weeks of age.
Effects of Dietary Protein Levels and Feeding Regimes on Performance of Broilers
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 25~31
This experiment was conducted to study the most economical and effective dietary protein level and feeding regimes in the performance of broilers. Four kinds of dietary protein level (25, 23, 20 and 18%) were prepared for this experiment. This experiment was carried on for 7 weeks and the results were shown as follows; 1. Increasing the dietary protein level resulted in a significant increase in the body weight gains (P〈0.05). 2. With a higher level of the dietary protein, the feed intake tended to be increased and the feed efficiency had same trends. 3. Increasing the dietary protein level resulted in a significant increase in the protein requirement per kg body weight gains (P〈0.05). 4. Viabilities were not affected by the different dietary protein levels. 5. The highest income had attained in the highest level of protein supplement, and the middle level of protein supplement was not higher than the lowest one. Conclusively, the highest level of protein supplement was considered to be adequate for the broiler's productiveity and income.
Effects of High Fiber Grains on the Growth Rate and Fat Accumulation in Broiler Chickens
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 33~38
Two hundred and forty female day-old broiler chicks were employed in this study to investigate the influence of grains containing different levels of dietary fiber on the growth rate, carcass fat content and abdominal fat pad weight. Corn and sorghum were used as low-fiber grains, and rye and hulled barley as high-fiber grains. During the 6 weeks of feeding period, chicks were fed one of the four diets which were iso-caloric and iso-nitrogenous. Birds were Tandomly allotted to 20 battery cages. There were five replicates per treatment and 12 chicks per replicate (pen). Data were subjected to the one-way ANOVA test, and when significant at 5% level, then means were compared by the method of Duncan (1955). At 3 weeks of age, rye-fed chicks grew significantly slower than did the other birds. At 6 weeks of age, the growth rates of chicks fed rye and sorghum were significantly lower than those of birds fed barley ana corn. Carcasses from birds fed rye showed significantly lower tat content than those from birds fed corn and sorghum at 3 weeks of age. No significant difference was found between rye and barley in this context. At 6 weeks of age. however, this difference in carcass fat content disappeared. No significant difference in abdominal fat pad weight was found among four grains at both 3 and 6 weeks of ages.
Studies on the Optimum Dietary Energy and Protein Levels in Laying Hen
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 39~53
A total of 1,440 White Leghorn pullets hatched in summer and winter, aged 20 to 72 weeks were fed 9 rations differing in dietary protein (13, 15 and 17%) and energy (2,500, 2,700 and 2,900 kcal/kg) levels for a period of 52 weeks in order to evaluate the optimum dietary energy and protein levels for laying hens. As metabolizable energy level increased from 2,500 to 2,900 kcal/kg of feed egg production, daily feed and protein intake and egg shell quality decreased, but reverse was true for the daily energy intake, energy requirement and feed cost per kg egg, body weight gain, nutrients utilizability and abdominal fat accumulation, Egg weight, viability and egg yolk Pigmentation were not affected by the dietary energy level. On the other hand, as dietary protein level increased from 13 to 17%, egg production, egg weight, daily protein intake, protein requirement per kg egg and body weight gain icreased, but daily feed and energy intake, feed and energy requirement per kg egg, egg yolk pigmentation and dry matter utilizability decreased, and no significant difference in the feed cost per kg egg, viability and egg shell quality was observed among dietary protein levels. However: the hens fed 15% and 17% Protein diets did not show significant differences in egg production, egg weight and body weight gain. For the entire laying period of 52 weeks, metabolizable energy level of 2,500 kcal/kg of feed and 15% dietary protein level were considered to be adequate to support the optimum productivity.
Effect of Varying Lighting Regimes on Broiler Performance
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 55~61
Four treatments were conducted to determine the effects of lighting regimes on the body weight gain and feed conversion of broiler chicks during 7 weeks: 1) 24 hours consistant lighting regime, 2) intermittent lighting regime of 1 hour lighting and 3 hours dark, 3) 20 hours lighting and 4 hours dark regime, 4) natural lighting regime. Each treatment was composed of three replications and 180 broiler male chicks were used in this experiment (45 chicks for each treatment,15 chicks for each replication). The results of this experiment were summarized as follows; 1. The body weight gains of 1 hour lighting＋3 hours dark regime were heavier than those of any other treatments during whole period, but no significant differences were found. In 1-4 weeks, the body weight gains of 1 hour lighting＋3 hours dark regime and 20 hours lighting＋4 hours dark regime were much heavier than those of natural lighting regime and 24 hours consistant lighting regime, but in 5-7 weeks, no differences were found among the 4 treatments. 2. The feed conversions of 1 hour lighting＋3 hours dark regime were improved more than those of any other treatments during whole period, but no significant differences were found. In 1-4 weeks, the feed conversions of 1 hour lighting＋3 hours dark regime and 20 hours lighting＋4 hours dark regime were much more improved than those of natural lighting regime and 24 hours consistant lightine regime, but in 5-7 weeks, no differences were found among the 4 treatments. 3. These results indicated that the intermittent lighting regimes such as 1 hour lighting＋3 hours dark and 20 hours lighting＋4 hours dark are more efficient on the body weight gain and feed conversion of broiler chicks than natural lighting regime and 24 hours consistant lighting regime.
Studies on the Hereditary Characters and Some Economical Traits of Korean Native Ogol Fowl III. Hemogram and Blood Chemical Values
Korean Journal of Poultry Science, volume 14, issue 1, 1987, Pages 63~68
To obtain the basic data applicable for the breed preservation, hemogram and blood chemical values in Korean native Ogol fowls were investigated. The results obtained were summarized as follows; 1. Erythrocytic and leukocyte counts did not show the significant differences along with growth and further differences in both male and female were not significant. 2. In blood chemical values, total Protein and blood glucose showed a tendency of increase with age in both sexes and cholesterol figured constant level at any ages in both sexes. In general, however, the values of cholesterol of male were higher than those of female.