• Asian-Australasian Journal of Animal Sciences
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• 제23권4호
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• pp.515-520
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• 2010

The response of broiler chicks to intubation of nutrients (starch, casein, soybean oil or their combinations) into the crop immediately after hatch was evaluated for performance, intestinal development, meat yield and immune competence up to 35 d of age. A control group with no access to feed and two test groups fed either inert material (sawdust) or starter diet for the initial 24 h after hatch were compared with nutrient intubated groups (n = 7). A total of 300 broiler chicks were equally distributed to 10 dietary groups with 6 replicates of 5 chicks each. After 24 h of hatch, all groups were fed ad libitum the starter (0-21 d) and finisher diets (22-35 d). Results indicated that post-hatch intubation of starch into the crop significantly (p${\leq}$0.05) improved body weight (at 14 and 35 d of age), readyto-cook meat yields, weights of breast muscle and small intestine segments, cell-mediated immune response, ND titers and weight of bursa compared to chicks starved or fed sawdust during the initial 24 h after hatch. However, chicks with access to feed immediately after hatch or intubation of starch, soybean oil, starch+casein, starch+soybean oil or starch+casein+soybean oil exhibited similar positive effects. Intubation of casein either alone or in combination with soybean oil was superior to the starved or sawdust fed groups, but inferior to other groups for all the parameters studied. It was concluded from the study that intubation of starch individually or in combination with casein and/or soybean oil effectively circumvented the negative effects of post-hatch starvation for 24 h. Among the nutrients intubated, carbohydrate (starch) was better utilized by the chicks than protein (casein) or fat during the initial post-hatch period.

• 한국축산식품학회지
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• 제38권5호
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• pp.835-850
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• 2018

The dramatic improvements in the growth rate and breast muscle size and yield in broilers through the intensive genetic selection, and the improvement in nutrition and management over the past 50 years have introduced serious abnormalities that influenced the quality of breast meat. The abnormalities include pale-soft-exudative (PSE) conditions, deep pectoral muscle (DPM) myopathy, spaghetti meat (SM), white striping (WS), and woody breast (WB) that have serious negative implications to the broiler meat industry. The incidences of PSE and DPM have been known for several decades, and their prevalence, etiology and economic impact have been well discussed. However, other abnormalities such as SM, WS and WB conditions have been reported just for few years although these conditions have been known for some time. The newly emerging quality issues in broilers are mainly associated with the Pectoralis major muscles, and the incidences have been increased dramatically in some regions of the world in recent years. As high as 90% of the broilers are affected by the abnormalities, which are expected to cause from $200 million to $1 billion economic losses to the U.S. poultry industry per year. So, this review mainly discusses the histopathological characteristics and biochemical changes in the breast muscles with the emphasis on the newly emerging abnormalities (SM, WS, and WB) although other abnormalities are also discussed. The impacts of the anomalies on the nutritional, functional, mechanical and sensory quality of the meat and their implications to the poultry industry are discussed.

• 한국축산식품학회지
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• 제21권4호
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• pp.285-291
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• 2001

본 연구는 활성탄을 사료에 첨가하여 그 첨가수준(0, 0.6, 0.9, 1.2%)에 따라 계육의 지방산 조성, 육색, 무김루의 변화를 검토하고자 broiler 48수를 공시하여 6주간 실험하였으며 특히 지방산과 무기물의 함량에 어떤 영향을 미치는가에 대하여 연구의 초점을 맞추었다. 대조구에 비해서 활성탄 0.6, 0.9%의 첨가구에서 oleic acid, arachidonic acid의 함량이 유의적으로 많았으며(p<0.05), 또한 활성탄 첨가수준에 따라 L*, a*, b* 값의 변화는 없었고, a* 값은 부위에 따라 유의성에 인정되었다(p<0.05). 활성탄 첨가수준에 따른 무기물 변화는 대조구에 비해 활성탄 첨가수준에 따른 무기물 변화는 대조구에 비해 활성탄 첨가구에서 Ca, Mg, P 함량이 많았으며(p<0.05) 총 무기물 함량은 활성탄 첨가구에서 많은 경향이었다. 따라서 본 연구의 결과 활성탄을 첨가하면 지방산은 oleic acid와 arachidonic acid 그리고 총무기물함량이 많아지는 경향이라고 결론 지을 수 있겠다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권11호
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• pp.1509-1517
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• 2004

A study was conducted to determine the safety of feeding processed broiler litter (BL) to beef cattle. The litter was processed by deepstacking, ensiling and composting. The health issues addressed relevant to the safety of feeding litter included pathogenic bacteria, mycotoxins, heavy metals, medicinal drugs and pesticide residues. Exp. 1 evaluated the feed hygiene of processed rice hulls-bedded BL. The presence of pathogenic bacteria in BL was determined before and after deepstacking. A total of 21 BL samples were collected over a 3-year period of commercial and experimental production of BL for beef cattle. Exp. 2 evaluated the safety of meat of cattle fed deepstacked BL. In Exp. 1, there were no pathogenic bacteria, such as coliform, E. coli, E. coli O157:H7, Salmonella, Listeria and Proteus, in deepstacked BL. Levels of heavy metals (Cu, Fe, Mn and Zn) and toxic heavy metals (As, Pb, Cd and Hg) were lower than the commercial feed tolerances. Aflatoxin, medicinal drug and pesticide residues were detected at extremely low levels. In Exp. 2, the meat of the BL-fed animals exhibited few differences in all analyzed items from that of the control group, showing safety from pathogenic microorganisms and heavy metals. When BL was withdrawn for 14 days prior to slaughtering the BLfed cattle, no medicinal drug residues were detected in the meat. Pesticides in the tissues of either group of animals were much lower than the tolerances. In conclusion, processed rice hulls-bedded BL and the meat of cattle fed BL were safe from the potential hazards of pathogenic bacteria, heavy metals, aflatoxin, medicinal drugs and pesticide residues.

• 한국가금학회지
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• 제36권3호
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• pp.223-229
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• 2009

본 연구는 항생제 사용 유무가 계육 품질 등급에 미치는 영향을 조사하기 위하여 전체 340육계농가(항생제사용 농가 305개소와 무항생제 농가35개소)를 대상으로 전체 10,420,792수 중 1농가 당 100수씩을 무작위로 선별하여 총 34,000수에 대한 등급 판정 결과를 활용하였다. 연구 결과 항생제 사용 유무에 따른 육계의 일당 증체량은 차이를 보이지 않았으나, 품질 A 등급 출현율은 항생제 사용 농가에서 출하된 계육(78.87%)이 무항생제 농가(73.46%)에 비해 높게 나타남이 확인되었다(P<0.05). 이러한 결과를 보인 이유는 품질 A 등급을 받기 위해 판정되는 경제적 및 비경제적 도체 결함의 발생 빈도가 무항생제 농가에서 출하된 계육이 항생제 사용농가에 비해 높게 나타났기 때문이며, 특히 도체 결함과 품질 A 등급과의 상관관계 분석에서 가장 높은 부(-)의 상관관계를 보인 외관 결함의 발생이 무항생제 농가에서 출하된 계육에서 항생제 사용 농가에 비하여 약 1.8배 높음이 확인 되었다. 본 연구결과 무항생제 농가는 항생제 사용 농가에 비해 높은 품질 등급의 계육 생산이 더 어려운 것으로 사료되며, 무항생제 계육 생산의 확대를 위해서는 국가적 차원에서 사양기술 수준의 향상, 천연 항생제 대체 물질의 개발과 함께 가격 차등에 따른 적절한 경제적 보상도 함께 이루어져야 할 것으로 판단된다.

• Animal Bioscience
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• 제37권7호
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• pp.1263-1276
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• 2024

Objective: Pine needles are rich in many nutrients and exhibit antibacterial and antioxidant biological activities; however, the effects of different production methods of pine needle additives on the growth performance and intestinal flora of broiler chickens are not known. Methods: Normal diets were supplemented with pine needle fermentation juice (PNF), pine needle soaking juice (PNS), or pine needle powder (PNP), and the associated effects on growth performance, relative organ weights, intestinal development, intestinal histological morphology, intestinal flora, meat quality, and serum indicators in broiler chickens were observed. Results: The results showed that PNF, PNS, and PNP all significantly improved feed utilization and promoted the growth and development of broilers. All three additives also significantly improved the structure of the intestinal flora, specifically increasing the diversity of bacteria; increasing the abundance of beneficial bacteria, such as Faecalibacterium, Rikenella, and Blautia; and decreasing the abundance of harmful bacteria, such as Staphylococcus. The antioxidant properties of pine needles were also found to intensify lipid metabolic reactions in the blood, thus leading to lower triglycerides and total cholesterol. Meanwhile, high doses of PNF reduced jejunum and ileum weights and also increased meat yellowness. Lastly, none of PNF, PNS, or PNP had an effect on relative organ weights or intestinal histological morphology. Conclusion: The addition of pine needles to the diet of broiler chickens can effectively promote their growth performance as well as improve their intestinal flora and serum status without side effects; in particular, the dose of 0.2% of either PNF and PNS is expected to have the capacity to replace growth-promoting antibiotics as diet additives.

• Asian-Australasian Journal of Animal Sciences
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• 제17권3호
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• pp.386-393
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• 2004

This study was conducted to investigate the effects of feeding dried leftover food (DLF) on growth, body composition and feed conversion of broiler chicks. One hundred ninety-six of one-day old Ross broiler chicks were assigned to 7 treatments in a completely randomized design. Each treatment had four replications with seven chicks per replication. The treatments groups included control without DLF, dietary 10% level of DLF, dietary 20% level of DLF and dietary 30% level of DLF, 5% higher protein level of diet containing 10% DLF, 10% higher protein level of diet containing 20% DLF and 15% higher protein level of diet containing 30% DLF than control diet. Body weight gain was slightly higher in control group than that of DLF-fed groups. However, there were no significant differences in body weight gain among those groups fed diets containing different levels of DLF. In general, increasing dietary level of DLF resulted in decreasing feed conversion. Content of crude protein in whole broiler body was slightly higher in control group although any significant difference was not found among treatments (p>0.05). Content of crude fat in whole broiler body was lowest in groups fed diets containing 30% DLF with 15% higher protein level than control diet, showing significant difference from groups fed diets containing 20% DLF (p<0.05). Contents of total cholesterol, free cholesterol, cholesterol ester and LDL- cholesterol in blood of broilers fed DLF-containing diets generally appeared to be higher compared with control group without significant difference (p>0.05). Fatty acid contents in broiler meat were higher in the order of oleic acid, palmitic acid and linoleic acid without significant differences among treatments. Content of DHA in broiler meat was higher in groups fed diets containing DLF than that of control group although there were no significant differences among treatments (p>0.05).

• Animal Bioscience
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• 제36권7호
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• pp.1075-1082
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• 2023

Objective: Animal feed companies and researchers are currently embarking on quests for feed additives that could combat the pathogens while promoting growth as well as maintaining quality products. The current study aimed to evaluate the effects of onion extracts on growth performance, carcass quality, and bone morphometrics of broiler chickens. Methods: A total number of 200 one-day-old unsexed Ross 308 broiler chicks were assigned to 5 treatment groups, replicated 4 times. Each replicate (pens) held 10 chickens in a completely randomized design. The experimental diets were then randomly allotted to the pens which act as experimental units. The isoenergetic and isonitrogenous diets were formulated by including onion extracts at 0, 5, 10, 15, or 25 g/kg in a complete broiler diet. Feed intake, and body weight, were recorded then used to calculate feed conversion ratio. At the end of the experiment (42 days), four chickens from each pen were randomly selected for slaughter for carcass, bone morphology and sensory evaluation. Results: Results showed that onion extract supplementation did not affect (p>0.05) growth performances and meat sensory evaluation. However, there was a significantly increased (p<0.05) meat shear force in groups receiving onion extracts dietary treatments. Furthermore, onion extracts improved (p<0.05) bone morphology of broiler chickens in terms of weight, diameter, calcium, and phosphorous contents. Conclusion: In conclusion, onion extracts can be safely included in a commercial broiler diet as a growth promoter without causing adverse effects on growth performance traits and carcass quality in chickens. Onion extract supplementation improved tibia bone growth and strength in broiler chickens.

• Asian-Australasian Journal of Animal Sciences
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• 제29권7호
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• pp.987-997
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• 2016

The objective of the study was to compare the carcass characteristics, meat quality, and blood parameters of slow and fast grown female broiler chickens fed in organic or conventional production system. The two genotypes tested were medium slow-growing chickens (SG, Hubbard Red JA) and commercial fast-growing chickens (FG, Ross 308). Both genotypes (each represented by 400 chickens) were divided into two sub-groups fed either organic (O) or conventional (C) systems. Chickens of each genotype and system were raised in a semi environmentally controlled poultry house until 21 d of age and were assigned to 5 pens of 40 chickens each. Then, O system chickens were transferred into an open-side poultry house with an outdoor run. At 81 d of age, 10 female chickens from each genotype and from each production system (n = 40) were randomly chosen to provide material for analysis, and were weighed and brought to the slaughterhouse to assess carcass characteristics and meat quality. The blood parameters were determined by using 5 female chickens from each genotype and from each production system (n = 20). FG had the higher live weight, along with carcass, breast, and thigh-drumstick weights compared to SG (p<0.05). FG had the higher breast yield, whereas SG had the higher thigh-drumstick yield (p<0.05). The O system resulted in a higher amount of abdominal fat (p<0.05). In addition, the O system values were higher for dry matter, crude ash, crude protein, and $pH^{15}$ values in breast meat, and for crude ash, crude protein, and $pH^{15}$ values in drumstick meat (p<0.05). In addition, total saturated fatty acids, total mono-unsaturated fatty acids, and total omega 3 were significantly higher in the O system than in the C system. Thus, the O system showed a positive advantage compared to the C system regarding female chicken meat quality, primarily within the ash, protein, and total omega 3 fatty acid profiles. In conclusion, the present study indicated that the main factor affecting the carcass characteristics of female chickens was genotype, whereas the organic system contributed to enhanced meat quality. These findings provide a better understanding of the relative roles of genotype and production systems in female broiler characteristics, and might aid producers in designing their facilities to optimize yield and quality while maintaining acceptable animal welfare standards.

• 한국가금학회지
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• 제48권4호
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• pp.239-253
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• 2021

본 연구는 Cobb종 및 Ross 308종 육계가 동물복지 사육환경에 따라 나타내는 대사체학적 변화를 연구하기 위하여 수행되었다. 일반농장과 동물복지농장(사육면적, 사육밀도, 암모니아 농도, 볏짚 등 제공)에 1일령의 Cobb종 및 Ross종 육계를 35일간 사육하고, 도계 후 가슴육과 다리육을 채취하여 분석에 이용하였다. 대사체 분석은 one-dimensional ¹H 핵자기공명분광법을 이용하였고, 직교부분최소자승판별분석(OPLS-DA)과 대사경로 분석을 함께 수행하였다. OPLS-DA 결과 육계 가슴육은 Ross종에 한하여 사육농장간 뚜렷한 구분이 가능하였다. 동물복지농장 유래 Ross종 육계 가슴육은 acetate, anserine, creatine, inosine monophosphate 함량이 일반농장 닭가슴육에 비해 유의적으로 높았다(P<0.05). 반면 육계 다리육은 OPLS-DA 결과 Cobb종 육계에서만 사육농장에 따른 구분이 뚜렷하게 나타났는데, glucose와 lactate를 포함한 5종의 대사체 함량은 동물복지농장에서 사육된 경우에 높았으나 7종의 유리아미노산을 포함한 9종의 대사체 함량은 낮았다(P<0.05). 대사경로 분석 결과 Ross종 육계 가슴육에서는 4종, Cobb종 육계 다리육에서는 glycolysis/gluconeogenesis를 포함한 20종의 대사경로에서 사육농장 간 유의적인 차이(P<0.05)가 나타났다. 동물복지농장에서 사육된 Ross종 육계 가슴육과 Cobb종 육계 다리육은 일반농장에서 사육된 경우와는 다른 대사체학적 특성을 나타냈으며, 특히 풍미 물질에의 뚜렷한 차이를 보여 관능적 특성에 영향을 미칠 수 있으리라 사료된다.