• 식품과학과 산업
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• 제48권3호
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• pp.37-44
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• 2015

• 한국패류학회지
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• 제26권4호
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• pp.297-302
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• 2010

개량조개의 종묘생산을 위한 생물학적 기초자료를 얻고자 난발생에 영향을 미치는 수온, 염분 및 수용밀도에 관하여 실험한 결과, 수온에 따른 난발생의 각 단계에 이르기까지의 수온 (TW, $^{\circ}C$)에 따른 발생속도 (h, 시간)는 $18^{\circ}C$, $23^{\circ}C$, $28^{\circ}C$ 및 $33^{\circ}C$에서 D형 유생까지 각각 33시간 30분, 20시간 40분, 18시간 15분 및 15시간이 소요되어 수온이 높을수록 빨랐으며, 그 관계식은 다음과 같다. 2세포기 : 1/h = 0.1051WT - 1.4782 ($r^2=0.9926$) 8세포기 : 1/h = 0.037WT - 0.3686 ($r^2=0.9648$) 낭배기 : 1/h = 0.008WT - 0.0521 ($r^2=0.9134$) 담륜자 : 1/h = 0.0041WT - 0.0235 ($r^2=0.9072$) D형유생 : 1/h = 0.0024WT - 0.0102 ($r^2=0.9611$) 개량조개의 수온과 난발생 속도와의 관계에서 추정된 난발생의 생물학적 영도는 평균 $8.0^{\circ}C$였으며, 개량조개 수정란은 D형 유생까지의 발생률을 고려할 때 발생 가능한 수온은 $18-28^{\circ}C$, 적정 수온은 $23^{\circ}C$였다. 개량조개의 수정란이 D형 유생으로 발생 가능한 염분은 20-35 psu로 나타났고, 염분에 따른 수정란의 D형 유생까지 발생률을 고려할 때 최소 25 psu 이상이며 적정 염분은 30-35 psu였다. 수정란으로부터 D형 유생까지의 발생률을 높일 수 있는 수정란의 수용밀도는 사육수 1 ml 당 40개 이하로 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제23권2호
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• pp.234-239
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• 2010

Effects of polyunsaturated fatty acid (PUFA) and vitamin E (VE) supplementation in the diet of breeder hens on the egg quality and hatchability, lipid peroxides of the egg yolk, and development of the newly-hatched offspring chicks were investigated. A total of 800 Avian 48, 28 wk-old broiler breeders were assigned randomly to 4 groups with 4 replicates of 45 females and 5 males. Each group was fed one of the following four diets with different oil sources and levels of VE: corn oil (CO), fish oil (FO), CO+VE and FO+VE. The results showed that: i) Addition of FO in the breeder diet reduced the whole egg weight, yolk weight, albumen weight, yolk color score and neonatal offspring chick body weight without affecting the hatchability as compared to the CO treatment. ii) Addition of VE efficiently reduced the lipid peroxides of egg yolk from hens fed diets containing FO. iii) VE in the breeder diet significantly promoted the development of liver and heart of the chick offspring.

• 한국양식학회지
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• 제12권2호
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• pp.115-122
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• 1999

Exposure experiments during the egg development were conducted to assess the influences of 5 different concentrations (0, 25, 50, 75 and 100%) of water-soluble fraction (WSF) of Kuwait crude oil on the eggs and larvae of black seabream (Acanthopagrus schlegeli), red seabream (Pagrus major) and olive flounder (Paralichthys olivaceus). All experiments were triplicated. Hatching time and hatching rate were examined on the eggs. The median lethal time ($LT_{50}$), morphological abnormality and swimming activity (swimming frequency and speed) of larvae were also investigated. The time and rate of egg hatching were not significantly influenced by WSF on the eggs of the fishes. The larvae exposed to WSF during the egg development were also not significantly influenced on the $LT_{50}$ and swimming activity. But the higher morphological abnormalities of notochord were observed from the larvae in 100% WSF exposure.

• Asian-Australasian Journal of Animal Sciences
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• 제15권11호
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• pp.1546-1552
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• 2002

Proliferation and differentiation of ovarian cells are regulated by gonadotrophins and various intraovarian factors, with many of their actions dependent on growth factors. Transforming growth factor-$\beta$ (TGF-$\beta$) has been reportedly involved in the regulation of ovarian follicular development. The overall objectives of the present study were to examine the influence of TGF-$\beta$1 expression in ovarian follicular development or yolk formation and to investigate the association of egg weight with ovarian TGF-$\beta$1 expression at 60 wk. Egg weights of 70 Korean Native Ogol Chicken (KNOC) were recorded from 20 to 60 wk. Ovaries were taken at 60 wk, and TGF-$\beta$1 was measured with ELISA, respectively. Based on egg weight up to 60 wk and TGF-$\beta$1 expression in ovary, the chickens were divided into high and low groups. Egg weights and follicle weight in the high TGF-$\beta$1 group were higher than those in the low groups. Also, TGF-$\beta$1 expression and follicle weight in high egg weight group were higher than those in the low groups. Taken together, the results indicate that TGF-$\beta$1 is associated with egg weight in KNOC. This association of TGF-$\beta$1 with egg weight in KNOC supports the report that TGF-$\beta$ is mainly involved in the development and differentiation of follicles in the poultry. Further studies about other endocrine factors related to yolk formation are required to fully understand the endocrine mechanism of egg weight in Korean Native Ogol Chickens.

• 농업과학연구
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• 제42권3호
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• pp.207-213
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• 2015

High-quality protein ingredients have been used in nursery diets, in spite of expensive ingredients, to minimize nutritional deficiency and disease problems. Recent dramatic increases in prices of protein products for nursery diets have exacerbated the challenge. Spray-dried egg may be a part of the solutions. Therefore, this review describes the value of spray-dried egg in nursery diets as a high-quality protein source. Spray-dried egg is egg by-product and is produced by only eggs without shell that are below the USDA Grade B standards. Spray-dried egg is an excellent nutrient source: 1) highly digestible, 2) excellent balance of amino acids, 3) rich content of fat, and 4) high metabolizable energy. These can be attributed to growth of nursery pigs. Beyond the provision of bioavailable nutrients, spray-dried egg also may provide specific physiological benefits. Spray-dried egg contains 1) immunoglobulin antibodies (IgY: IgG in egg yolk) that may attach to intestinal pathogens and excrete them and 2) lysozymes antimicrobial protein that can damage bacteria cell wall. Thereby feeding spray-dried egg may reduce concentration of intestinal pathogen and thus improve potential gut health or enteric disease resistance in nursery pigs. This is important for physiologically immature weaned pigs. Based on these benefits, spray-dried egg is believed to have the same benefits as spray-dried plasma protein and milk products in diets for nursery pigs. Therefore, it is suggested that spray-dried egg has a great potential as a valuable protein source in nursery diets.

• 유통과학연구
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• 제21권7호
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• pp.83-90
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• 2023

Purpose: This study aims to set desirable directions for Korea's egg industry by comparing and analyzing the egg distribution structure and policies between Korea and other countries. Research design, data and methodology: We analyzed the current state of egg distribution in Korea, and based on this analysis, we derived problems. In addition, by comprehensively analyzing the egg distribution structure and policy issues in the US, EU, and Japan. Results: As a result of the analysis of the egg distribution status and policy in the country to be analyzed, it was found that for the development of the egg industry in Korea, it is necessary to unify the distribution system for transparent and stable management of the egg distribution process. It was found that detailed and clear information creation and management of egg production and distribution processes were required. Conclusions: We need to establish a regional egg distribution facility base and stipulate that eggs produced in Korea must be compulsorily traded through the regional facility base. Seemingly, scaling-up of the industry is the priority, but the government is promoting various policies to expand small and medium-sized egg joint markets, with limitations in improving the problems of the existing egg distribution structure.

• 한국잠사곤충학회지
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• 제3권
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• pp.23-28
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• 1963

(1) 산란후 유정란의 RNA량은 계속 증가하여 제 5일에 최고 (제 1일의 약 2.1배)에 달하고 제 6일부터 약간 감소된다. 이와 같은 RNA 량의 변동은 잠란의 배자형성 및 발육과 밀접한 관계가 있는 것으로 생각된다. (2) 무정란의 RNA 량은 산란직후부터 유정란의 그것에 비하여 대단히 적고 (약 절반임) 제 4일까지 약간의 증가를 보이나 제 5일부터 감소한다. (3) 조사유정란은 방사선조사(3,000 r)후 제 2일까지는 RNA 량이 약간 증가하나 그 후부터는 별 변동이 없다. 즉 방사선 조사로 란 RNA 합성이 크게 억제됨을 알 수 있다.(4) 침산처리란은 침산처리 제 4일부터 RNA 량이 격증하여 부화 1일 전인 제 7일까지 계속된다. 비침산란은 해기간중 RNA 량의 변동이 거의없다. 조사침산처리란 (1,500 r)에 있어서는 조사후 제 3일까지는 비조사란과 달라 RNA 량이 감소되었다가 제 4일부터 격증하여 제 7일까지 계속된다.

• 한국발생생물학회지:발생과생식
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• 제19권1호
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• pp.25-31
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• 2015

We have launched an investigation for Embryonic Development, Larvae and Juvenile Morphology, of Buenos aires tetra in order to build basic data of Characidae and fish seeding production. We brought 50 couples of Characidae from Bizidduck aquarium in Yeosu-si, Jeollanamdo, from Korea on March of 2015. We put them in the tetragonal glass aquarium ($50{\times}50{\times}30cm$). Breeding water temperature was $27.5{\sim}28.5^{\circ}C$ (mean $28.0{\pm}0.05^{\circ}C$) and being maintained. The shape of fertilized egg was round shape, and it was adhesive demersal egg. The egg size was 0.63~0.91 mm (mean $0.74{\pm}0.07mm$, n=20). After getting fertilized egg, the developmental stage was gastrula stage, and embryo covered almost two-thirds of Yolk. Incubation was happened after 16 hours 13 minutes from gastrula stage, and the tail of juvenile came out first with tearing egg capsule. Immediately after the incubation, prelarvae had 3.78~3.88 mm length (mean $3.84{\pm}0.04mm$, n=5), and it had no mouth and anus yet. 34 days after hatching from the incubation, juvenile had 8.63~13.1 mm (mean $10.9{\pm}1.66mm$), and it had similar silver-colored body shape with its mother.

• 한국수산과학회지
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• 제53권2호
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• pp.203-208
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• 2020

This study was carried out to clarify the larvae and juveniles of egg development and autonomous development of Hemibarbus longirostris from Korea, and to obtain basic data for species conservation and seed production. The shape of the egg was circular and sticky. The average size of the eggs was 2.01 mm (n=10). At 185 hours after fertilization, more than 50% of the total embryos were hatched. The newly hatched larvae had an average total length of 8.10 mm (n=5) and had egg yolk in the abdomen. At 3 days after hatching, the larvae absorbed all egg yolk was average total length 8.64 mm. On the 6 days after hatching, the caudal tip of the notochord started to curve upwards was average total length 10.9 mm. At 70 days after hatching, the average total length 37.9 mm. The number of fins was i 8-10 in dorsal fin, iii 7 in the anal fin, and ii 5 in the ventral fin.