• Ocean and Polar Research
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• 제28권3호
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• pp.237-243
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• 2006

The ages of sandfish, Arctoscopus japoninis sampled from the eastern sea of Korea, were determined by the transverse section method of otoliths. Ages were assigned to every individual according to the number of opaque zones, and then fitted to the von Bertalanffy growth equation. Estimated equations were $L_t=25.90(1-e^{-0.2976(t+0.4447)})$ for females and $L_t=21.38(1-e^{-0.2917(t+1.2087)})$ for males, where t is age (year) and $L_t$, is body length (mm) at age t. These two equations were significantly different and the body length of females calculated from the equation was larger than that of males except at 1 year old.

• 생명과학회지
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• 제16권2호
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• pp.333-338
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• 2006

청소년 남 녀의 채형관련 변인의 연령증가에 따른 발육 달성율의 변화양상을 분석 평가 하였다. 4개부위의 피하지방후 합은 $12{\sim}14$세를 제외한 전연령구간에서 여자가 남자보다 유의하게 높았으며, 13세를 분기점으로 성차가 커지는 경향을 보였다. 골의 상완골폭은 $13{\sim}15$세를 제외한 전연령구간에서 남자가 여자에 비해 높았으며, 15세를 분기점으로 성차가 컸다. 대퇴골폭은 전연령구간에서 남자가 여자보다. 유의하게 높았으며, 연령이 증가할수록 성차가 약간씩 커지는 경향이었다. 근육의 상완이두근최대위는 7세를 제외한 전연령구간에서 남자가 여자보다. 유의하게 높았으며, 15세를 분기점으로 성차가 점차가 커졌으며, 하퇴대위는 남 녀 모두 연령이 증가할수록 높아지는 경향을 나타내고, $10{\sim}15$세에는 여자가 남자보다 높았다가 16세 이후 남자가 높아지는 교차현상을 나타내었다. 체형의 내배엽성요소는 $10{\sim}11$세를 제외한 전연령구간에 서 여자가 남자보다 높은 반면, 중배엽성요소는 15세를 제외한 전연령구간에서 남자가 여자보다 높았고, 외배엽성요소는 $8{\sim}12$세에 여자가 남자보다 높았다가 13세 이후 남자가 높아지는 교차현상을 보였다. 종합적으로 청소년 남 녀의 체형관련 변인에서 지방조직의 발육정도는 여자가 남자를 앞서며, 근과 골의 발육정도는 남자가 여자보다 높았다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.327-327
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• 2017

The effect of different seedling ages and transplanting times on the growth and yield of Indica ${\times}$ Japonica rice for noodle processing was evaluated to develop a high yielding cultivation technology for increasing the competition against the imported foreign rice. Four seedling ages (10-, 20-, 30- and 33-day old) of two Indica ${\times}$ Japonica rice cultivars (cvs. Saemimyeon and Palbangmi) and three transplanting dates (May 20, May 30 and June 9) were used in the study. Our results showed that the growth and rice yield of the two cultivars were significantly affected by the different seedling ages and transplanting times. Dry matter production at the panicle heading of the two rice cultivars were generally higher in the 30-day old seedling than the other seedling age treatments and then gradually decreased as the transplanting time was delayed from May 20 to June 9. Similar high panicle number per square meter were recorded at the 30-day old seedling between May 20-May 30 transplanting times. In contrast, other yield parameters that includes spikelet number per panicle, 1,000-brown rice weight, and ripened grain ratio (except for the June 9 transplanting time of Palbangmi) were not significantly affected. The milled rice yield of Saemimyeon was higher than that of the Palbangmi regardless of seedling ages and it was also the highest at the 30-day old seedling with four seedling ages. The milled rice yield of Saemimyeon was only slightly decreased as the transplanting time was delayed from the May 20 to June 9 but Palbangmi had a significantly lower milled rice yield at June 9 transplanting due to the low ripened grain ratio. The result indicates that the most suitable seedling age for the cultivars tested was at 30-day old seedling for noodle processing rice and recommended transplanting times were between May 20 and May 30 for the high rice yield in the Yeongnam plain area.

• Clinical and Experimental Reproductive Medicine
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• 제13권2호
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• pp.195-200
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• 1986

In order to know when the cumulus cells of mouse follicles get ability to expand in vitro, the oocyte cumulus complexes obtained from different growing ages of mice were cultured in the medium containing HCG and their rate of expansion were observed and at the same time their maturation rate was examined. The growth of follicles was also checked by histological method. It was impossible to isolate the oocyte-cumulus complexes from 13 or 15 days old mouse ovaries. The oocyte-cumulus complexes collected from 17 days old mouse were partially induced to expanded by HCG, and from 19 days, most of the complexes were induced to full expansion. The rate of cumulus cell expansion by HCG and the oocyte maturation increased steadly during the growing ages to adult. Thus, the time for follicles to get competence for expansion and maturation seems to be closely related. Antral follicles were appeared from 17 days old mice and Graafian follicles were seen from 21 days old mice. The competence for cumulus expansion increased during follicle growth up to 21 days old mice.

• Journal of Animal Science and Technology
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• 제44권2호
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• pp.165-170
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• 2002

본 연구는 한우의 성장형태 분석을 위한 성장곡선 모수 추정시 이용하는 체중 측정자료의 최적 월령을 결정하기 위해 실시하였다. 분석에 이용한 자료는 농협 한우개량부에서 사육된 한우 수소 1,133두의 일령별 체중자료를 이용하였으며, 비선형 회귀모형인 Gompertz 모형으로 성장곡선을 추정하였다. 24개월까지 측정한 자료에 대해 14개월부터 2개월 단위로 최종 자료입력 시기를 분할한 6개의 측정종료 월령별 체중자료에 대해 추정한 성장곡선 모수 가운데 성숙체중(A)은 22개월령과 24개월령의 추정치 평균간 차이에 유의성이 없었으며, 성숙률(k) 추정치는 18-24개월령의 추정치 평균간 차이가 유의성이 없는 것으로 나타났다.(p$<$0.05). 측정종료 월령별 성숙체중(A) 추정치간의 상관 계수는 22개월령과 24개월령간에 0.93으로 가장 높게 나타났으며, 성숙률(k) 추정치간의 상관계수는 18-24개월령간에 0.91-0.99로 높게 나타났다(p$<$0.05). 성숙체중과 성숙률 추정치간의 상관은 12개월령의 경우 0.84로 높게 추정되었으나, 22개월령과 24개월령의 경우 0.12 및 0.10으로 추정되어 체중자료의 최종입력 시기가 연장됨에 따라 추정 모수간의 상관이 낮아지는 것으로 나타났다. 따라서 한우의 체중 성장 형태를 분석하기 위한 성장곡선 추정을 위한 자료의 최종 입력시기의 최적 월령은 22개월령 이상으로 사료된다.

• 보건교육건강증진학회지
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• 제14권1호
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• pp.161-172
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• 1997

In order to assess the physical growth and development, and nutritional status of primary, middle and high school students in the city of Seoul, physiques of 4, 041 persons(Male : 2, 096, Female: 1, 945) were measured from March 1 to July 31 in 1995 and variouis physical and nutritional indices, maximum growth age related to them were calculated. The results are as follows: 1. Physical Growth and Development The growth of body height showed straight linear development among male in the ages 7~16 and among female 7~14, and after that showed slower development. The age of cross over between two sexes was between 11.5 to 12.5 years of age. The maximum growth age was between 11 and 12 years of age(7.28cm) in male and between 11 aqnd 12 years of age(9.77cm) in female. In terms of body weight, it also showed straight linear development among male in the ages 7~16 and among female 7~14, and after that showed slower development. The maximum growth age was between 11 and 12 years of age(7.64kg) in male and between 11 and 12 years of age(8.l9kg) in female. In terms of chest girth, it showed two step development among male in the age of 7~13 and 13~17, and among female in the age of 7~14 and 14~17. The age of cross over between two sexes was 11 and 12 years of age. In terms of sitting height, it showed two step development in the age of 7~14 and 14~17 of both sexes and the age of cross over between two sexes was between 10.5 to 14.5 years of age. The maximum growth age was between 11 and 12 years of age(3.64cm) in male and between 11 and 12 years of age(5.98cm) in female. 2. Maximum Growth Age of Physical Growth and Development In body height, MGA was 10.59 for male and 10.34 for female which showed that MGA for both sexes appeared in similar periods. In body weight, MGA was 10.30 for male and 10.30 for female which showed that MGA for both sexes appeared in similar periods. In chest-girth, MGA was 14.74 for male and 11.60 for female which showed that MGA for female appeared about 3 years earlier than for male. In sitting height, MGA was 11.69 for male and 11.38 for female which showed that MGA for both sexes appeared in similar periods. Maximum growth ages of physiques appeared in order of body height 〉 body weight 〉 sitting height 〉 chest-girth.

• 한국산림과학회지
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• 제95권1호
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• pp.131-138
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• 2006

본 연구는 우리나라 천연활엽수림의 대표적 수종인 신갈 굴참나무를 대상으로 흉고직경 생장량 패턴을 알아보고, 14개의 임목 측정인자와 직경생장량과의 관계를 규명하기 위하여 실시하였다. 본 생장량 자료는 강원도 천연활엽수림지역에서 벌도 된 83본의 신갈 및 굴참나무에 대하여 수간석해를 통하여 분석하였다. 두 수종 모두 우세목의 경우 평균적으로 15~20년까지 흉고직경생장률이 높게 나타나다가 그 이후부터는 일정한 생장량을 갖고, 매년 0.09~0.83 cm/yr의 흉고직경생장을 하는 것으로 나타났다. 최근 5년간의 연년직경생장량은 신갈나무가 평균 0.28 cm/yr로 굴참나무 평균 0.27 cm/yr 자라는 것으로 실측되었으며, 두 수종 모두 우세목, 준우세목, 중간목, 피압목 순으로 생장이 좋은 것으로 확인되었다. 특히, 신갈나무의 경우는 수관급간에 직경생장량이 매우 유의적인 차이 (p<0.0001)가 있는 것으로 나타났다. 또한, 14개의 입목 측정인자와 조제변수를 이용하여 최근 5년간의 연년직경생장량과 Pearson 상관분석을 실시한 결과, 신갈나무의 경우 상대직경(r=0.64), 상대수고(r=0.61), 노출된 수관투영면적(r=0.58), 전체 수관투영면적(r=0.56)순으로 상관관계가 높게 나타났으며, 굴참나무는 흉고직경(r=0.57), 수관폭(r=0.55), 연령(r=0.39), 경쟁지수(r=-0.39), 수고(r=0.35)순으로 상관관계가 있는 것으로 나타났다.

• 한국육종학회지
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• 제40권4호
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• pp.377-386
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• 2008

스트로브잣나무의 생장을 산지별, 조림지별로 조사 분석한 결과, 국내에서 가장 우수한 생장을 나타내는 산지는 North Carolina, 가장 우수한 조림지는 춘천이었는데, 측정형질 공히 산지보다는 조림지에 따른 생장의 차이가 큰 것으로 나타났다. 형상비 분석을 통한 수목 생장은 비교적 안정적이었으며, 조림지별로 수령에 따라 매우 다른 양상을 나타냈다. 스트로브잣나무의 생장 강수량, 안개일수, 고도, 토양의 모래함량과 정의 상관관계가 인정되었으며, 연령 간 높은 정의 상관관계를 나타냄으로서 유령기 생장순위가 중기까지 그대로 유지되어 우수 산지 조기 선발의 가능성이 높은 것으로 판명되었다.

• Animal Bioscience
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• 제34권12호
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• pp.1886-1894
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• 2021

Objective: Growth hormone (GH) and insulin-like growth factor I (IGF-I) play a critical role in animal growth rates. We aimed to investigate the effect of GH and IGF-I genotypes on body weight (BW), dominance, and gene expression in slow-growing chickens at different ages. Methods: A total of 613 Korat chickens (KRs) were bred and divided into three groups by genotype - A1A1, A1A3, and A3A3 for GH and AA, AC, and CC for IGF-I. Chickens were weighed every two weeks, and liver and breast muscle tissues were collected at 10 weeks of age. Genetic parameters of KRs were estimated using ASReml software. The GH and IGF-I mRNA levels were measured by quantitative polymerase chain reaction. Significant differences between traits were analyzed using the generalized linear model. Results: A significant effect of GH genotypes on BW was found at most ages, and the A1A1 genotype had the highest value of BW. Compared with the A3A3 genotype, the A1A1 and A1A3 genotypes showed a higher dominance effect at 0 and 2 weeks, and genotype A1A1 had the highest value of dominance at 8 weeks of age. A difference in GH mRNA levels between genotypes was detected in breast muscle at 6 weeks and in the liver tissue at 2 weeks. In the case of IGF-I gene, the AA genotype had the highest BW at the beginning of life. Significant differences in BW dominance were found at 2 weeks. However, IGF-I mRNA levels were not different among genotypes in both breast muscles and liver tissues. Conclusion: Our results revealed that GH and IGF-I influence growth, but may not be involved in heterosis. GH can be used as a marker gene in selection programs for growth because the homozygous genotype (A1A1) had the highest BW at all ages. The IGF-I is not a useful marker gene for selection programs.

• 한국어류학회지
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• 제26권3호
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• pp.194-201
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• 2014

태안 연안에서 이각망에 어획된 숭어 이석을 관찰하여 연령을 사정하고, 이석 윤문의 폭으로부터 체장을 역추정하여 성장을 추정하였다. 태안 연안 숭어는 외해에서 산란하여 유어기를 보낸 후 성어가 연안으로 들어온 것으로 보이며, 관찰한 숭어의 전장은 239~605 mm 범위였으며, 400~550 mm 크기의 개체가 주를 이루었다. 나이는 1~7세 범위였고 3~5세어가 가장 많았다. 전장(L, mm)은 이석의 장반경(R, ${\mu}m$)에 유의하게 일차 비례하였다(L=15.3+87.9 R). Frazer-Lee의 방법으로 추정한 각 연륜이 형성되었을 때의 전장은 1세어의 평균(${\pm}SD$)은 $316{\pm}40.6mm$로 초기 성장이 빨랐으며, 각 나이에서 그 범위가 넓어 개체에 따른 성장률 차이가 큰 것으로 보인다. 역추산한 전장은 Von Bertalanffy의 성장식 $L_t=542[1-{\exp}\{-0.493(t+0.769)\}]$로 유의하게 회귀되었다.