• Korean Journal of Poultry Science
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• v.47 no.4
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• pp.275-283
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• 2020

This experiment was conducted to investigate the effect of the addition of enzymes and microorganisms to broiler feed on productivity, carcass characteristics, intestinal microflora, and feces odor. A total of one-hundred eighty 180 chicks (Ross 308) were randomly assigned to 5 treatments with 3 replications each having 12 birds per pen. The experimental group was divided into 0.1% EZ group (0.1% metallo-protease added to the feed), 0.2% EZ group (0.2% metallo-protease added to the feed), M group (2.0% Bacillus veleznesis CE 100 added to the feed), and MW group (2.0% Bacillus veleznesis CE 100 added to the feed and drinking water). In the results, final body weight, body weight gain, the feed conversion ratio, protein efficiency, and energy efficiency were not significantly different among all treatments in across all periods. Carcass weight, proventriculus, gizzard, heart, small intestine, cecum, and rectum weight were not significantly different among all of the treatments. However the liver weight was significantly higher in the 0.1% EZ group than in the control, M and MW groups (P< 0.05). E. coli was significantly lower in MW than in the control and M (P<0.05), and it was significantly higher in the M than 0.2% EZ and MW (P<0.05). H2S emissions in feces was not significantly different among all treatments, but NH3 emissions was were significantly higher in 0.1% EZ than in MW (P<0.05). In conclusion, the addition of 0.1% of metallo-protease was effective in the development of the liver of broilers.

• Korean Journal of Poultry Science
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• v.18 no.3
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• pp.167-181
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• 1991

In order to study the effects of dietary yeast (Saccharomyces cerevisiae) products on the performance of broiler chickens, tow feeding trial using Arbor Acres strain were conducted. In experiment 1, 200 hatched male broiler chickens were divided into groups of 10 birds each and four groups were given each of the five dietary treatments : control, 0.25% yeast culture supplemented (YC-0.25%), 2.5% yeast culture supplemented(YC-2.5%), 0.05% live yeast supplemented(LY-0.05%) and 0.1% live yeast supplemented(LY-0.1%) . In experiment 2, 240 hatched broiler chickens(120 birds in each sex) were assigned to 2$\times$3(sex$\times$feed) factorial design Dietary treatments were control, 0.1% live yeast supplementation in finisher diet(LY-Finisher) , and 0.1% live yeast supplementation in whole period (LY-Whole). Results of experiment 1 showed that weight gain, feed intake and mortality were not significantly different among treatments. However, weight .gain of YC-0.25% and LY-0.1% tended to be greater than other treatments after 3wks of age Feed efficiency of LY-0.05% was poorer than those of control, YC-0.25% and LY-0.1% . Although nutrients availabilities were not significantly different among treatments, availiabilities of Ca and P were greater in yeast products supplemented groups than in control group. The number of Lactobacillus spp., Streptococcus spp . and yeast in small intestine tended to be greater in supplemented groups while that of Coliforms bacteria tended to be greafter in control group. In experiment 2, there were significant effects of factors (feed and sex) and interaction on growth rate. LY-Whole groups showed best weight gain in male while LY-Finisher groups did best in female broiler chickens. Feed intake and mortality were significantly higher in male broiler chickens. Feed$\times$sex interaction had a significant effect on feed efficiency. LY-Whole groups showed best feed efficiency in male while LY-Finisher did best in female broiler chickens. Availabilities of dry matter, Ca and P were higher in male than in female broiler chickens. Availabilities of Ca and P were higher in live yeast supplemented groups than in control groups. Live yeast supplemented groups tended to have greater number of Lactobacillus spp . and yeast in the small intestine and Stre))tococcu spp. in the small intestine and cecum, and lesser number of Coliforms bacteria in the small intestine The pH of small intestinal contents tended to be higher in live yeast supplemented groups.

• Korean Journal of Poultry Science
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• v.42 no.3
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• pp.257-265
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• 2015

Heat conditioning at an early age has been known to help chickens cope with heat stress later in life. The present study was conducted to determine the effects of heat conditioning at 5 days of age in broilers repeatedly exposed to high ambient temperature later in life. A total of 256 day-old Arbor Acre boiler chicks were housed in two identical rooms with a 23-h light/1-h dark cycle and provided with feed and water ad libitum. At 5 days of age, the birds in one room were exposed to $37^{\circ}C$ for 24 hours, while those in the other room served as controls. On day 21, half of the birds in each room were moved into the other room so that each room contained both control and heat-conditioned birds. After a 7-day adaptation period, the birds in one room were exposed to high ambient temperature ($21^{\circ}C{\rightarrow}31^{\circ}C$) for 3 days, whereas those in the other room were kept at normal temperature. The same 3-day exposure to high ambient temperature was repeated two weeks later. Hence, there were four treatment groups (CON+CON: control+control; CON+HS: control+high ambient temperature; HC+CON: heat conditioning+control; and HC+HS: heat conditioning+high ambient temperature). Repeated heat stress resulted in decreased feed intake, water intake, body weight gain, and spleen weight (p<0.05) and increased rectal temperature (p<0.05), mortality, and plasma corticosterone concentrations. The relative weight of the spleen was increased in the heat-conditioned group (p<0.05). Plasma biochemicals were also influenced by high temperature. Thus, no beneficial effects of heat conditioning at an early age were detected in broilers repeatedly exposed to high ambient temperature later in life.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2002.11a
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• pp.122-123
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• 2002

An experiment was conducted to investigate the effect of dietary supplemental protease on performance, blood components, organ weight and protein digestibility. Two hundred and fifty, one day old cobb x cobb male broiler chicks were assigned to 4 treatments with 4 replicates. Four levels of protease were supplemented with 0, 40, 80 and 160U. Weight gain, feed intake, feed conversion were weekly measured for 5 weeks. Blood components and organ weight were examined at the end of experiment. Metabolic feeding trial was carried out to investigate the protein digestibility for one week at five weeks of age. Basal diets contained 21.5, 19.0% CP and 3,100, 3,200kca1/kg ME for starter and finisher, respectively. Weight gain of chicks fed 80U protease was significantly higher than other treatments for starting period(P〈0.05). Feed conversion of chicks fed protease addition diets was improved as dietary protease increased. It showed significant difference between 80U and control groups(P〈0.05). Sera protein tended to be lowered in protease added groups. HDL-cholesterol was decreased at the maximum level of protease. However, organ weight and protein digestibility were not influenced significantly by dietary protease level. In conclusion, the present study demonstrated that protease addition in broiler diets improved the feed conversion.

• Korean Journal of Poultry Science
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• v.36 no.3
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• pp.215-222
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• 2009

The objective of this study was to evaluate the effects of dietary Solanum nigrum L. (SNL) and Glycyrrhiza uralensis Fisch (GUF) mixture powder on performance and blood compositions of broilers. Seven-day old Ross broiler male chickens were randomly given into one of the 5 dietary treatments for 5 weeks: 1) no SNL-GUF and antibiotics (control); 2) 5 ppm avilamycin (T1); 3) 0.5% SNL and GUF (T2); 4) 1.0% SNL and GUF (T3); and 5) 2.0% SNL and GUF (T4). Each dietary group (n = 10) had three replicates. Body weight gain, feed intake and feed conversion ratio of broiler chickens were not significantly different among treatments. Carcass weight was highest at both 4 (P<0.05) and 6 weeks (P>0.05) in the treatment with 1.0% SNL and GUF. Liver, but not Spleen, weights at both 4 and 6 weeks were significantly higher in the treatments with 0.5% SNL and GUF treatment (P<0.05). The contents of protein, albumin, bilirubin, glutamic-oxaloacetic transaminase (GOT), glutamic-pyruvic transaminase (GPT), glucose, triglyceride (TG) and cholesterol in blood serum at the 4weeks and 6 weeks were not significantly influenced. These results suggest that addition of SNL and GUF could be use a substitutes for antibiotics since they did not influence to the productivity and the blood composition of the broilers.

• Journal of Veterinary Clinics
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• v.27 no.1
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• pp.17-22
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• 2010

The natural herbal antimicrobial additive, Flavo-$SK^{TM}$, was developed by Zoonosis Research Center of Wonkwang University. The purpose of this study was to evaluate the effects of Flavo-$SK^{TM}$ on the health status and performance of growing chickens. This study was conducted on the growing chickens (n=20,000) for 31 days in a growing chickens husbandry. The animals were divided with two groups; Flavo-$SK^{TM}$ treated group (n=10,000) and commercial diet feeding group (n=10,000). The Flavo-$SK^{TM}$ treated animals had provided with commercial diet adding the Flavo-$SK^{TM}$ as 0.29%. During the study period, we compared clinical signs, weight increase rate, diet consumption amount, gross finding, necropsy findings and histopathological findings between the treated group and non treated group. As the results of this clinical trial, the natural herbal antimicrobial additive, Flavo-$SK^{TM}$, showed the effects on disease reduction. It is suggested that Flavo-$SK^{TM}$ has the antimicrobial effects.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.89-90
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• 2003

Effects of interaction of dietary soybean oil with NaHCO$_3$on the energy metabolism and antioxidants enzyme activity in broiler chicks during acute phase response was studied, Broiler chicks 10 d-old were fed on diets containing 5.0 ％ of soybean oil with or without 0.5 ％(60 meq/kg) of NaHCO$_3$. Then acute phase response were induced by injecting Salmonella typhymurium lipopolysacharide(LPS) In saline 3 times i.p. at alternative day on 16-d of age. Dietary soybean oil with NaHCO$_3$lessened the performance(growth, feed efficiency, calcium balance, excretion of uric acid, and nitrogen balance) -suppressing effect of the LPS effect, but enhanced metabolizable energy value of diet due to increased digestive absorption of energy sources and phosphoruse balance, and decreased activities of SOD in erythrocyte cytosols and circulating ceruloplasmin in plasma. The results indicated dietary energy utilization and electrolytes levels may interact with the antioxidants systems during acute phase response.

• Korean Journal of Poultry Science
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• v.36 no.2
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• pp.149-155
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• 2009

The present study was conducted to compare the carcass yields and meat characteristics of three types of commercial male chicks White mini broilers, Ross broilers and Hy-Line brown chicks under the identical feeding condition. One-hundred 1-d chicks of each type were randomly placed into four pens per group (25 chicks per pen) and fed corn-soybean meal based commercial diets for 35d, 18d or 49d, respectively. At the end of the feeding trial, the birds were sacrificed and subjected to carcass measurements. The dressing percentages of White mini broilers and Ross broilers were significantly higher (P<0.05) than that of Hy-Line brown cockerels. The rate of breast meat of Hy-Line brown cockerels was significantly lower (P<0.05) than those of White mini broilers and Ross broilers. However, Hy-Line brown cockerels showed higher (P<0.05) leg meats than the others. There were no significant differences in serum total cholesterol and the activities of glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase among the groups. The breast meats of White mini broilers presented highest lightness value. The yellowness of breast and redness of leg meats of White mini broilers and Ross broilers were significantly higher (P<0.05) than those of Hy-Line brown cockerels. There were no significant differences in the SOD-like activity and change of pH in edible meats among the groups. The meat color in White mini broilers was significantly higher than that of Hy-Line brown cockerels. No significant differences were observed in term of flavor, tenderness and overall acceptability. In conclusion, the physico-chemical properties and sensory characteristics of edible meats were not greatly affected by genotype if they were similar body weights and kept under the identical feeding condition. But the Hy-Line brown cockerels were less desirable as a meat-type strain due to lower carcass yields and inferior growth and feed conversion ratio.

• Journal of Animal Science and Technology
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• v.44 no.4
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• pp.399-406
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• 2002

An experiment was conducted to investigate the effects of supplemental copper or/and zinc methionine chelates(Cu-Met or/and Zn-Met) on the performance, nutrient digestibility, serum IgG level, gizzard erosion, and the contents of Cu and Zn in liver and excreta of broiler chickens. One thousand d-old broiler chickens (Ross$^{(R)}$) were assigned to 4 treatments: control, 100 ppm Cu in methionine chelate(Cu-Met), 100 ppm Zn in methionine chelate(Zn-Met) and 100 ppm Cu plus 100 ppm Zn in methionine chelate(Cu-Zn-Met). Each treatment had five replications of 50 (25 male + 25 female) birds each. Average weight gains of chicks fed chelated Cu or/and Zn were significantly higher than that of chicks fed the control (P<0.05). Moreover, feed conversion rates of chicks were better in the chicks fed chelated Cu or/and Zn than in the chicks fed the control (P<0.05). The birds fed the chelated Cu and Zn(Cu-Zn-Met) tended to perform the best growth rate and feed conversion rate. Nutrient digestibilities were not affected by the dietary treatments. Serum IgG level of chicks fed Cu-Zn-Met was significantly higher than that of chicks fed the control (P<0.05). Gizzard erosion index was not significantly different among the treatments. The contents of Cu and Zn in liver were not significantly affected by the dietary treatments. The excreta contents of Cu or/and Zn were significantly high in the birds fed supplementary Cu or/and Zn. It was concluded that dietary supplementation of Cu or/and Zn in methionine chelated form improved growth and feed conversion efficiency of broilers.

• Journal of Life Science
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• v.20 no.2
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• pp.231-236
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• 2010

Antibiotics in veterinary medicine have been used to treat disease, promote growth rate and improve feed efficiency. However, alternative sources are needed because of of bacterial resistance to antibiotics and residues of antibiotics. The present study was carried out to evaluate the effect of CS682, a fermentation product of Korean soil bacteria, on safety, growth rate and feed efficiency, and to evaluate its value as an alternative for antibiotics used as a feed additive. Two dosages of CS682 (0.1% and 1%) were fed to chickens for 28 days. The results showed that, when compared to chickens in the control group, growth and feed efficiency was improved. Also, mortality, hematology, general clinical signs and necropsy were examined. Chickens in the treatment groups showed no adverse effects. A total of 72 weaning pigs were used to confirm the effects of CS682 at one dose level (0.1%) regarding feed efficiency. Supplementation with 0.1% CS682 also resulted in improved weight gain and feed efficiency ratio. Based on these results, CS682 may be effective in improving feed efficiency safely as a feed additive.