• 한국임상수의학회지
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• 제22권2호
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• pp.125-129
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• 2005

This experiment was conducted for the development of oriental feed additives in broiler chicks. It conducted experiment to investigate the effect of $1\%$ dietary supplementation of oriental feed additives containing oriental herbal medicines such as Saururus Chnensis B.(S. chnensis) and Carthamus Tinctorius L.(C. tinctorius) on growth performance, and physicochemical properties in broiler chicks. The results of this study demonstrated that chicks feed $1\%$ oriental feed additives decreased feed gain, and death rates compared with control treatment. Weight gain and meat color were higher in the $1\%$ supplement group than control. The supplementation of $1\%$ oriental feed additives increased unsaturated fatty acid, and reduced crude fat in the broiler chicks compared with those of control. In conclusion, this study implied that oriental feed additives containing oriental herbal medicines such as S. Chnensis and C. Tinctorius were effective in improving broiler chicks on growth performance, physical-chemical properties and is highly recommended for increasing economic returns.

• 한국가금학회지
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• 제9권2호
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• pp.63-101
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• 1982

육용계에서 가식육량을 효과적으로 추정할 수 있는 방법을 구명코자 White Cornish종과 S. C. W. Leghorn종. 그리고 이 두 품종의 상반교잡종을 각각 120수씩 계 480수를 공시하여 체중. 부위별 가식육 및 체형의 변화, 이들 형질에 발현된 잡종강세와 반성유전효과 및 화학적 조성분함량을 조사하고. 성장단계별 가식육량을 추정한 결과를 요약하면 다음과 같다. 1. W. Cornish종의 8주시 체중 및 사료요구율과 폐사율을 보면 각각 1,818.8$\pm$47.7g와 2.24 및 3.30%였고 S. C. W. Leghorn종에선 각각 667.8$\pm$28.9g와 3.28 및 2.50%였으며 잡종들의 능력은 이 두 품종의 중간정도로 정상발육을 하였다. 2. 체중에 있어서 계종간 차이는 2주령부터 유의성이 인정되었고. 성장곡선의 회귀방정식에서 성장속도를 표시하는 회귀계수률 보면 W. Cornish종( $b_{cc}$ =1,578)은 S. C. W. Leghorn종 ( $b_{LL}$ =1,378)에 비해 유의적으로 크고 교잡종들은 이 두 품종의 중간값( $b_{LC}$ =1,476, $b_{CL}$ =1,470)을 보인다. 가식육량의 경우도 계종간 증가양상이 체중의 경우와 비슷하였으나 육량증가의 회귀방정식에서 회귀계수의 크기가( $b_{LL}$ =1,563, $b_{LC}$ =1,651, b.$_{CL}$ =1,636, $b_{CC}$ =1,766) 체중에서 보다 컷는데 그 원인이 성장속도 차이때문인지를 구명하기 위해 주령(log x)과 체중에 대한 가식육량비율(log y) 간의 선형관계를 추정한 결과 각 계종의 회귀계수( $b_{LL=0.184}$, $b_{LC}$ =0.175, $b_{CL=0.165}$ 및 $b_{CC}$ =0.188)는 모두유의성이 인정되어 가식육의 증가속도는 체중의 증가속도보다 현저히 빠른 것으로 판명되었다. 3. 체중구성요소중 주령경과에 따라 그 중량비율이 증가되는 것은 우모, 복강지방, 흉부 및 퇴경부이고, 감소되는 것은 두부, 경부, 가식내장 및 부가식내장이며 방혈량, 각부, 익부 및 배부는 큰 변화를 보이지 않는다.

• 농업과학연구
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• 제38권4호
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• pp.695-701
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• 2011

The study was carried out to investigate the effect of lighting regimes on performance and meat quality of broiler. A total of 912 chicks was divided into 2 groups with male (3 replications/group, 34 heads/replication) and female (3 replications/group, 42 heads/replication). Treatments were control (C, natural lighting), T1 treatment (24L), and T2 treatment (1~2d, 24L; 2~4d, 23L+1D; 4~16d, 16L+8D; 16~21d, 18L+6D; 21~42d, 23L+1D) by lighting regimes. Lysine content of male chicken meats at T2 treatment was lower compared to that of other treatments (p<0.05). There was no significant difference in all nonessential amino acid (AA) among treatments. Methionine content of female chicken meats at T2 treatment was lower compared to that of other treatments (p<0.05). The rate of C16:0, C16:1n7, and C18:1n9 of male chicken meat at T2 treatment was higher than that of other treatments (p<0.05), while C18:2n6 was lower at T2 treatment than other treatment (p<0.05). Mono-saturated fatty acid was the highest at T2 treatment, however, polysaturated fatty acid was the lowest at that treatment (p<0.05). There was no considerable difference in fatty acid composition of female chicken meat among treatments. Finally, lighting regime didn' affect on amino acid and fatty acid contents, and used possibly on energy reduction.

• 한국응용과학기술학회지
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• 제34권4호
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• pp.807-817
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• 2017

본 연구는 Bacillus subtilis를 포함하는 3개의 균주를 지렁이 분변토에 접종하여 제조한 생균제인 분변토 발효사료가 육계의 사양성적 및 닭고기 품질에 미치는 영향을 조사하기 위하여 수행하였다. 육계 240마리를 4개의 처리구로 완전임의 배치하였다. 실험 처리구는 대조구, Lactobacillus fermentum으로 제조된 상업용 생균제 (CP) 0.2%, 분변토 발효사료 0.3% (FECF3), 분변토 발효사료 0.5% (FECF5)로 구분하였다. 평균 체중 증가량, 흉선, 비장, F낭의 무게는 대조구, CP 처리구와 비교할 때 FECF 처리구가 높았다. 혈액 IgG 함량은 대조구, CP 처리구와 비교할 때 FECF 처리구가 증가하였다. 맹장 Lactobacillus는 대조구, CP 처리구와 비교할 때 FECF 처리구가 높았으나 Escherichia, Salmonella, Coliform bacteria 및 total aerobic bacteria는 FECF 처리구가 낮았다. 닭고기의 보수력은 대조구, CP 처리구와 비교할 때 FECF 처리구가 높았다. 닭고기 n-6/n-3 지방산의 비율은 대조구, CP 처리구와 비교할 때 FECF 처리구가 낮게 나타났다.

• 농업과학연구
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• 제45권3호
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• pp.411-418
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• 2018

A total of 576 seven-day-old male Ross 308 broilers with an average initial BW of $180{\pm}1g$ were used in a 4 week feeding experiment which included a starter phase (7 to 21 d) and a grower phase (22 to 35 d). Birds were randomly allocated into 1 of 3 treatments with 12 replicates per treatment and 16 birds per pen. The treatments consisted of the following: T1, Control; T2, T1 + 0.1% Creamer (Dongsuh Foods Corporation, Incheon, Korea), and T3, T1 + 0.5% Creamer. The broilers were weighed by pen and feed intake (FI) and the number of living broiler chickens were recorded on d 7, 21, and 35. These information were used to calculate the body weight gain (BWG) and feed conversion ratio (FCR). As results of this experiment, there were no significant differences in the BWG, FCR and nutrient digestibility among the treatments. With regards to meat quality, no adverse effects were observed among the treatments. However, a higher score in redness was observed in T3 than in T1. In addition, the relative weight of breast muscle was reduced in T3 compared with T1. Regardless of the nondairy creamer (NDC) inclusion levels, no negative effects on growth performance and nutrient digestibility were observed. In conclusion, non-dairy creamer could be a kind of fat sources additive in broiler diets, further studies are needed to test the optimum levels of the NDC to be supplemented in broilers diet.

• Asian-Australasian Journal of Animal Sciences
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• 제17권8호
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• pp.1112-1117
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• 2004

This experiment was conducted to compare the effects of vitamin C supplemented in either feed or water on the performance and carcass characteristics of broilers during the hot season. For a 6 week feeding trial, a total of 330 broiler chicks (Ross, 4 d old, average 57 g BW) were alloted to five treatments. The treatments of vitamin C (VC) supplementation were 1) 0 ppm VC, 2) 10 ppm VC in feed, 3) 20 ppm VC in feed, 4) 5 ppm VC in water and 5) 10 ppm VC in water. During the starter phase (0-3 week), chicks on non-supplemented group grew slower (p<0.01) than the supplemented ones, and a similar trend was also noted during finisher stage and the overall stage. Feed intake was significantly (p<0.05) higher in supplemented groups and higher when fed in feed as compared with water during all stages. But feed conversion efficiency was significantly improved in non-supplemented groups compared to supplemented ones in finisher and overall stage. The digestibility of gross energy and ether extract was significantly (p<0.05) higher during starter phase in supplemented, given in feed, and at higher levels as compared with non-supplemented, given in water, and at lower levels, respectively. The bone resistance was significantly (p<0.05) higher in supplemented, supplied in feed groups as compared with their counterparts. Except breast meat, the dressing percentage and abdominal fat were also higher in supplemented group and the dressing percentage was significantly (p<0.05) higher in VC supplemented in feed as to water, but no effect of supplementation was noticed on meat color when compared between the methods of feeding (feed vs. water). The levels of VC in plasma and liver increased linearly, as the level of supplementation both in feed and water increased and it was significantly (p<0.05) higher in feed group as compared with water group. It can be concluded that, retention and availability of vitamin C in feed was higher than those in water, and supplementation of VC during summer was beneficial for poultry.

• Asian-Australasian Journal of Animal Sciences
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• 제33권3호
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• pp.465-479
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• 2020

Objective: This study performed a meta-analysis of published trials to determine the effects of zinc on the immune response and production performance of broilers. Methods: A database was built from published literature regarding the addition of zinc forms or doses and their relation to the immune response and production performance of broilers. Different doses or forms of zinc were identified in the database. The recorded parameters were related to the immune response and production performance. The database contained a total of 323 data points from 41 studies that met the criteria. Then, the data were processed for a meta-analysis using a mixed model methodology. The doses or different forms of zinc were considered fixed effects, different studies were treated as random effects, and p-values were used as the model statistics. Results: An increase in zinc dose increased (p<0.05) pancreas metallothionein (MT) and zinc concentrations in the plasma, tibia and meat, all in quadratic patterns, but linearly decreased (p<0.05) the heterophil/lymphocyte (H/L) ratio. Regarding the different zinc forms, both inorganic and organic zinc increased (p<0.05) the zinc concentrations in the plasma and tibia, the calcium and phosphorus contents in the tibia, and the antioxidant activity of superoxide dismutase in meat as compared to control. An increase in zinc dose increased average daily gain (ADG) and decreased feed conversion ratio (FCR) following a quadratic pattern (p<0.05). Inorganic and organic zinc decreased (p<0.05) FCR and H/L ratio than that of control, but these two forms were similar for these parameters. Conclusion: Zinc addition has a positive impact on immunity and broiler production. Zinc can suppress stress and inhibit the occurrence of lipid peroxidation in broilers, and it can also improve ADG, FCR, and the quality of broiler carcasses.

• Food Science and Biotechnology
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• 제15권3호
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• pp.431-436
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• 2006

Effects of vacuum packaging and modified atmosphere packaging (MAP) on shelf life of selenium-supplemented chicken meat during refrigerated storage were examined. Body weight and feed efficiency were unaffected by dietary selenium level. Dietary treatments and packaging methods had no significant effects on level of microbial growth, lightness, and metmyoglobin content. MAP decreased purge loss (10.9-34.5%) and lipid oxidation (15.2-15.9%) more efficiently than vacuum packaging. Broiler chicks supplemented with ${\alpha}$-tocopherol or ${\alpha}$-tocopherol + selenium had similar TBA values. Dietary supplementation of 4 and 8 ppm selenium reduced lipid oxidation, and this effect was less significant in MAP breast meat.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2002년도 가을 학술발표논문집
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• pp.87-89
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• 2002

사료에 여러 종류의 xanthophylls(lutein, canthaxanthin, astaxanthin, capxanthin)을 30ppm 수준으로 6주간 얻은 닭고기 육균질물의 산화 억제를 구명하기 위해 모델 시스템을 통한 실험을 실시하였다. Xanthophyll을 급여한 계육의 가슴육과 다리육에서 대조에 비해 TBARS (thiobarbituric acid reactive substances) 값이 낮은 것으로 보아 사료 첨가에 의한 고기에서 항산화성을 확인하였다. 특히, 처리구 중 가슴육에서는 lutein이 다리육에서는 lutein과 astaxanthin이 다른 처리구들에 비해 항산화성이 높은 것으로 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제31권11호
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• pp.1807-1817
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• 2018

Objective: This study aimed at investigating white striping (WS) and wooden breast (WB) cases in breast meat collected from commercial broilers. Methods: A total of 183 breast samples were collected from male Ross 308 broilers slaughtered at the age of 6 weeks (n = 100) and 7 weeks (n = 83). The breasts were subjected to meat defect inspection, meat quality determination and histology evaluation. Results: Of 183, 4 breasts from 6-week-old broilers were classified as non-defective while the others exhibited the WS lesion. Among the 6-week-old birds, the defective samples from the medium size birds (carcass weight ${\leq}2.5kg$) showed mild to moderate WS degree with no altered meat quality. Some of the breasts from the 6-week-old birds with carcass weight above 2.5 kg exhibited WB in accompanied with the WS condition. Besides of a reduction of protein content, increases in collagen matter and pH values in the defective samples (p<0.05), no other impaired quality indices were detected within this group. All 7-week-old broilers yielded carcasses weighing above 2.5 kg and showed abnormal characteristics with progressive severity. The breasts affected with severe WS and WB showed the greatest cook loss, hardness, springiness and chewiness (p<0.05). Development of WB induced significantly increased drip loss in the samples (p<0.05). Histology indicated necrotic events in the defective myofibers. Based on logistic regression, increasing percent breast weight by one unit enhanced the chance of WS and WB development with advanced severity by 50.9% and 61.0%, respectively. Delayed slaughter age from 6 to 7 weeks increased the likelihood of obtaining increased WS severity by 56.3%. Conclusion: Cases of WS and WB defects in Southeast Asia have been revealed. Despite few cases of the severe WS and WB, such abnormal conditions significantly impaired technological properties and nutritional quality of broiler breasts.