• Asian-Australasian Journal of Animal Sciences
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• 제20권5호
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• pp.661-668
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• 2007

Data on 1,037 Nili-Ravi buffaloes from four institutional herds were used to study lifetime milk yield, herd life, productive life and breeding efficiency. A general linear model was used to study the environmental effects while an animal model having herd, year of birth and age at first calving (as covariate) along with random animal effect was used to estimate breeding values. The lifetime milk yield, herd life, productive life and breeding efficiency averaged $7,723{\pm}164$ kg, $3,990{\pm}41$ days, $1,061{\pm}19$ days and 64 percent, respectively. All the traits were significantly (p<0.01) affected by the year of birth and herd of calving, while the herd life was also affected (p<0.01) by the age at first calving. The heritabilities for lifetime milk yield, herd life, productive life and breeding efficiency were $0.093{\pm}0.056$, $0.001{\pm}0.055$, $0.144{\pm}0.079$ and 0.001, respectively. The definition for productive life, where each lactation gets credit upto 10 months had slightly better heritability and may be preferred over the definition where no limit is placed on lactation length. The genetic correlation between productive life and lifetime milk yield was low but high between productive life and herd life. The selection for productive life will increase herd life while lifetime milk yield will also improve. The overall phenotypic trend during the period under the study was negative for lifetime milk yield (-280 kg/year), herd life (-93 days), productive life (-42 days/year) and breeding efficiency (-0.36 percent/year), whereas the genetic trend was positive for lifetime milk yield (+15 kg/year) and productive life (+4 days/year).

• 종축개량
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• 제12권6호통권76호
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• pp.77-79
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• 2007

• 대한가정학회지
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• 제44권6호
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• pp.35-45
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• 2006

The purpose of this study is to investigate productive activities effect on psychological well-being in the elderly. As people grow older, the level of physical function and psychological well-being is decreased. But We verified maintaining productive activities could make buffering effect on psychological well-being. And We investigate what kind of productive activities could effect on psychological well-being by gender. As a result, there were differences in self efficacy belief, life satisfaction and depression by age, education, absence of spouse, subjective economic status and physical function. Group activity and domestic labor had on affirmative effect on self efficacy belief in male and female elder. Learning activity had on positive effect on life satisfaction in female. Depression was negative influenced by voluntary activity and domestic labor in female and pay work, group activity and domestic labor in male.

• The Korean Journal of Ecology
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• 제15권3호
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• pp.221-229
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• 1992

This experiment was carried out to investigate the effect of liming on life form and ecological behaviour of stand in low productive grassland with acidified solil at dairy fram in yesan, chungnam province. The inferior plant community of low productive grassland was improved to the most desirable pasture association with herbage of 84% by liming. the life forms of association in low productive grassland were composed of hemicryptophytes of 49.4%, therophytes of 48.2%, geophytes of 2.2% and chamaephytes of 0.2% but by liming their life forms of hemicryptophytes increased greatly by 32.6%, on the other hand geophytes were much more decreased by 33.4%. The ecological behaviour of moisture figure and nitrogen figure were slightly increased and soil reaction figure was gradually decreased in low productive grassland by liming.

• 한국노년학
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• 제41권1호
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• pp.49-68
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• 2021

본 연구는 활동적 노화의 관점을 바탕으로 노년기 생산적 활동과 미래시간조망에 간의 관계에서 삶의 만족감의 매개효과를 검증한 연구이다. 연구방법은 제 7차 고령화연구패널(The Korean Longitudinal Study of Aging 2018) 조사자료를 활용하여, 55세 이상 고령자 6,756명의 생산적 활동, 삶의 만족감과 기대수명 기대감 및 일자리 기대감의 두 차원으로 측정한 미래시간조망의 관계를 복합표본 일반선형모형을 적용하여 분석하였다. 연구결과, 생산적 활동은 삶의 만족감 및 미래시간조망과 유의한 관계가 있는 것으로 나타났다. 구체적으로 비경제 활동자에 비해 무급 가족종사자를 포함한 취업자일수록 삶의 만족감, 기대수명 기대감, 일자리 기대감이 높은 것으로 나타났다. 이러한 생산적 활동과 미래시간조망 간의 관계는 삶의 만족감이 부분 매개하고 있는 것으로 나타났다. 즉, 비경제 활동자에 비해 무급 가족종사자를 포함한 취업자일수록 기대수명 기대감 및 일자리 기대감이 높아지는데, 이는 높아진 삶의 만족감의 영향에 의한 결과일 수 있음을 의미한다. 본 연구의 결과는 노년기 생산적 활동이 활동적 노화의 목적인 노년기 삶의 질을 향상시키고 미래를 긍정적으로 확장하여 조망하기 위한 중요한 요인임을 강조하였다. 이상의 연구 결과를 토대로 노년기 생산적 활동을 제고하기 위한 정책적 함의 및 시사점을 제시하였다.

• 가족자원경영과 정책
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• 제18권4호
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• pp.91-110
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• 2014

The purpose of this study is to examine the effect of preparation for old age on the life satisfaction, and the mediating effect of productive activities on the relationship between preparation for old and life satisfaction among the old age in Korea. The subject for this study is 226 older adults who participated in the work fare program of community welfare centers. The collected data were analyzed with SPSS WIN(ver.18.0) program, and frequency analysis, descriptive analysis, multiple regression, and Sobel test were utilized. The result revealed that productive activities has a partial mediating effect between preparation for old Age and life satisfaction. Based on these findings, the theoretical and practical implications were discussed.

• Journal of Preventive Medicine and Public Health
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• 제21권1호
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• pp.1-4
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• 1988

The current use of leading causes of death is an outmoded, misleading counterproductive measure of importance of disease. The 'new' concept of productive years of life discounted to the future and combined with morbidity, disability, and direct cost measures will give a much more meaningful, useful measure of the magnitude of disease problems in Korea. I am looking forward to seeing refinements and improvements on this technique carried out by some readers of this paper.

• 한국인구학
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• 제30권3호
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• pp.57-81
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• 2007

현재 각 사회에서 진행되는 생산적 노년 논의가 사회적 생산성을 유지하고 사회적 부담을 해결하려는 방향으로 진행되고 있으며 이것은 노인의 활동성과 독립성에의 강한 가치부여로 나타난다. 본 연구는 <2004년도 전국노인생활실태 및 복지욕구조사> 자료 분석을 통해서 노인집단 내부에 나타나는 생산적 활동의 복합적인 양상을 조명한다. 노인의 생산적 활동 중 유급노동활동과 사회지원활동 두 영역에서 활동에 참여하는 노인의 경제적 기반과 자발성, 가족과의 관계에 따라 복합적 경향을 엿볼 수 있다. 이러한 점은 노인의 생활만족도 분석에서 더욱 두드러진다. 연구 결과, 대표적 생산적 활동인 유급노동의 경우 경제적 기반이 양호한 상태이고 참여 동기가 노인의 자율적 선택에 의한 자발적인 활동인 경우에는 생계유지를 위해 불가피하게 활동에 참여하는 노인과 비교하여 생활만족도에서 큰 차이를 보였다. 또 다른 생산적 활동 영역인 사회지원활동 중 가정일 및 돌봄 활동의 경우, 참여노인의 경제적 상황과 지원대상인 가족과의 관계에 따라 나누어 생활만족도를 비교했을 때 가족관계에 불만족하는 경우에 생활만족도가 눈에 띄게 떨어진다.

• 농업과학연구
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• 제42권3호
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• pp.245-251
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• 2015

Records of 490,767 cows collected from 1990 to 2012 by dairy herd milk test of National Agriculture Cooperative Federation The pedigree of dairy cattle were provided by Korea Animal Improvement Association. The data were used to analyze the longevity of dairy cows with the life traits such as days in milk, number of lactation, productive life, and life span. The data were also used to investigate genetic relationship of these longevity traits with profitability of dairy cows, including heritability and genetic correlation. The profitability was calculated with simulation of milk income and production costs for individual cows. Days in milk among the traits had -0.287, -0.572 and -0.536 of genetic correlation with number of lactations, productive life and lifespan, respectively. The heritabilities of life span, number of lactations, productive life, and days in milk were found to be 0.045, 0.047, 0.059 and 0.081, respectively. Genetic correlations of profit with productive life, number of lactations, and days in milk were identified as 0.072, 0.080, 0.098 and 0.101. These results suggested that days in milk was most desirable traits to represent longevity of Holstein dairy cattle. In general, since longevity and profitability were close genetic relationship each other, genetic improvement of longevity is necessary for better profitable cows.

• Asian-Australasian Journal of Animal Sciences
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• 제28권9호
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• pp.1259-1265
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• 2015

The present study was performed to study the genetic relationship of productive life with production and type traits of Korean Holsteins at first three lactations. The data for the analysis from 56,054, 28,997, and 11,816 animals of first, second and third parity cows which were born from 2006 to 2011 were collected by Dairy Cattle Improvement Center, National Agricultural Co-operative Federation. Milk, protein and fat yields adjusted for 305 days and average somatic cell score considered as production traits and analyzed type traits were stature, strength, body depth, dairy form, rump angle, rump width, rear leg side view, foot angle, front attachment placement, rear attachment height, rear attachment width, udder cleft, udder depth, front teat placement and front teat length. A multi trait genetic analysis was performed using Wombat program with restricted maximum likelihood animal model composed of fixed effect of birth year, farm and the random effect of animal and random residual effect according to the traits. Heritability estimates of productive life were between 0.06 and 0.13. Genetic and phenotypic correlations between production and productive life traits ranged from 0.35 to 0.04 for milk, 0.16 to 0.05 for protein and 0.18 to 0.02 f 15-0034 (2nd) 150520 or fat. Somatic cells score showed a negative genetic and phenotypic correlation with productive life and also udder type traits, indicating that the selection for higher udder traits will likely to improve resistance to mastitis and persistence in the herd. Among all dairy form type traits, udder characters such as udder cleft showed a significant relationship with productive life. However, a specific change of heritabilities or correlations were not observed with the change of parity. Moreover, further studies are needed to further confirm the significance of the above traits and the effect of parity on above relationships in order to minimize both voluntary and involuntary culling rates while improving herd health and maintaining high yielding dairy cows.