• Korean Journal of Poultry Science
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• v.14 no.1
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• pp.63-68
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• 1987

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.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1996.04a
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• pp.248-248
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• 1996

경구투여급성독성시험 : 암수동물의 모든 투여군에서 시험물질투여에 의한 일반증상, 체중변화 및 육안적 부검소견은 관찰되지 않았으며. 따라서 반수치사량(LD$_{50}$)은 암수동물의 경우 5000mg/kg이상이었다. 경구투여아급성독성시험 : SD랫트의 암수 동물에 있어서 Captopril(SR Tablet 25mg)의 2000mg/kg 용량은 확실중독량에 해당되며, 무영향량(NOEL)은 220mg/kg용량이라고 사료되었다.

• KOREAN POULTRY JOURNAL
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• v.22 no.5 s.247
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• pp.52-53
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• 1990

• Korean Journal of Ornithology
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• v.25 no.2
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• pp.69-76
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• 2018

Sexual dimorphism in birds refers to male-female differences in body size, plumage, color and/or behavior. In general, many seabirds, including the family of Laridae, are monomorphic in plumage-color, which makes the determination of sex difficult in the field because both parents also tend to share a great portion of parental care. The development of an inexpensive sexing tool facilitates understanding the degree of sex-specific parental care in the evolution of the life history. Here, we developed a non-invasive method for the determination of sex using the bill-head morphometric of known captive pairs and applied this tool to wild pairs to document factors underlying male-female parental care during the incubation period of Saunders's gulls (Saundersilarus saundersi). Males exhibited relatively larger bill-head ratios than their mates within naturally formed pairs in captivity, resulting in the determination of sex in12 wild pairs at the nest during the incubation period. Males and females equally shared the incubation role during the daytime, attending the nest at a high rate of 95%. However, the male's proportion of nest attentiveness greatly increased with time towards sunset, presumably reflecting the male duty for nighttime incubation. The present study provides a non-invasive method for the determination of sex in a monomorphic seagull species and highlights how male-female incubation behavior is associated with time of the day, rather than other ecological conditions.

• Korean Journal of Poultry Science
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• v.49 no.2
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• pp.89-98
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• 2022

This study compared the production and physiological characteristics of male and female Korean native commercial chickens. We investigated the growth performance, vitality, and stress response of 479 male and 608 female chickens from 1 d to 12 weeks of age. The body weight, feed consumption and feed conversion ratio were measured as growth performance. The survival rate, amount of telomeric DNA, DNA damage rate, heterophil-lymphocyte ratio (H/L ratio), and heat shock protein (HSP)-70, HSP-90α, and HSP-90β gene expression levels were analyzed as indicators of vitality and stress response. Body weight was significantly higher in male chickens than in female chickens after 2 weeks of age (P<0.01). Feed intake was higher in male chickens than in female chickens, whereas the feed conversion ratio showed the opposite trend. The survival rate was significantly higher in female chickens than in male chickens (82.8% vs. 73.8%, P<0.05). Stress response analysis revealed no differences between male and female chickens in terms of telomeric DNA content, DNA damage rate, H/L ratio, and HSP gene expression levels. Taken together, it was concluded that there was a significant difference in the growth performance and survival rate between male and female Korean native commercial chickens, whereas there was no difference in the degree of stress response between them. Therefore, in terms of the productivity of Korean native commercial chickens, it is judged that separate-sex rearing is much more advantageous than mixed rearing, regardless of the physiological characteristics of males and females.

• KOREAN POULTRY JOURNAL
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• v.22 no.8 s.250
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• pp.93-95
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• 1990

• 종축개량
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• v.12 no.1 s.71
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• pp.120-123
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• 2007

• KOREAN POULTRY JOURNAL
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• v.14 s.155
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• pp.148-151
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• 1982

• KOREAN POULTRY JOURNAL
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• v.38 no.4 s.438
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• pp.127-129
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• 2006

• KOREAN POULTRY JOURNAL
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• v.17 no.2 s.184
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• pp.104-108
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• 1985