搜索结果: 1-15 共查到“知识库 fertility”相关记录501条 . 查询时间(0.062 秒)
《Social Science in China》:The Impact of Spousal Relationships on Fertility Intentions of One-Child Urban Young Couples
Spousal Relationships China Social Science
2024/3/26
雷速公司共建数据
Below-replacement fertility has spread from developed industrialized countries to some developing countries, including China. Based on the theory of the transformation of intimacy, this study utilizes...
Long-Term Soil Fertility and Site Productivity in Stem-Only and Whole-Tree Harvested Stands in Boreal Forest of Quebec (Canada)
forest biomass whole-tree harvesting soil productivity site quality index soil provinces
2023/12/19
Using residual biomass from forest harvesting to produce energy is viewed increasingly as a means to reduce fossil fuel consumption. However, the impact such practices on soil and future site producti...
Placental characteristics of German Landrace sows and their relationships to different fertility parameters
pig placenta fecundity placental efficiency litter number litter size
2018/11/23
The placenta is the central foetal organ that ensures a sufficient exchange of nutrients and metabolites for adequate foetal growth. Specific data profiles for placental characteristics from modern pi...
Soil fertility and productivity estimation of Pinus pinaster Aiton reforestations in Central and Northeast Chalcidice in Northern Greece
Degraded ecosystems conifer native vegetation accumulation of nutrients forest floor mineral soil
2018/3/6
Maritime pine (Pinus pinaster Aiton) is a notable fast-growing conifer, native to the Western Mediterranean Basin,
which is considered suitable for reforestations. This tree species was artificially ...
Effect of the FGF2 SNP11646 on milk production and fertility traits of Holstein cattle
dairy cow fibroblast growth factor single nucleotide polymorphism linear mixed model
2016/9/1
The objective of this study was to estimate the effect of a single-nucleotide polymorphism (SNP11646) in the FGF2 (Fibroblast Growth Factor 2) gene on the deregressed proof of breeding values (DRP) of...
Examining underlying determinants of fertility rates in Zambia:Evidence from the 2007 Zambia Demographic and Health Survey
Underlying determinants Fertility Education Wealth Zambia
2016/7/7
Limited data exits on factors influencing fertility in Zambia. This study examined underlying determinants of fertility patterns and levels in Zambia. Data extracted from the 2007 Zambia Demographic a...
Women's Education and Family Behavior:Trends in Marriage,Divorce and Fertility
Marital and fertility patterns Racial and educational lines Financial security
2016/3/18
This paper examines how marital and fertility patterns have changed along racial and educational lines for men and women. Historically, women with more education have been the least likely to marry an...
Demographic Transition Revisited: Low Fertility, Socioeconomic Development, and Gender Equity
Demographic Transition Low Fertility Below-replacement Fertility Gender marriage
2016/3/17
While new empirical findings and theoretical frameworks provide insight into the interrelations between
socioeconomic development, gender equity, and low fertility, puzzling exceptions and outliers i...
It is Lower Than You Think it is: Recent Total Fertility Rates in Brazil and Possibly Other Latin American Countries
Fertility Brazil Total Fertility Rate Latin America Births Low Fertility
2016/3/17
Understanding emerging patterns of low fertility in middle-income countries is of essential importance. We
demonstrate that the use of the P/F Brass methods in Brazil to adjust for a presumed underre...
Where There Is a Will:Fertility Behavior and Sex Bias in Large Families
Fertility Behavior Sex Bias Large Families
2016/3/3
This paper demonstrates that the social institutions of lineage maintenance, patrilocality, and joint families have a significant role in explaining sex differences in survival and health outcomes in ...
Impact of Changes in Marriage Law:Implications for Fertility and School Enrollment
Marriage Law Fertility School Enrollment
2016/3/3
Does the postponement of marriage affect fertility and investment in human capital? I study this question in the context of a 1957 amendment to the Mississippi marriage law that was aimed at delaying ...
Booms, Busts, and Fertility Testing the Becker Model Using Gender- Specifi c Labor Demand
Booms Busts Fertility
2016/3/2
In this paper, I present estimates of the effect of local labor demand shocks
on birth rates. To identify exogenous variation in male and female labor
demand, I create indices that exploit cross- ...
Preservation effects of melatonin on the quality and fertility of native Fars rooster semen during liquid storage
chicken sperm antioxidant lipid peroxidation
2016/2/23
Liquid or frozen storage of poultry semen negatively affects the sperm motility and has crucial role in reducing fertility. Phospholipids in chicken sperm membrane are composed of high proportions of ...
Preservation effects of melatonin on the quality and fertility of native Fars rooster semen during liquid storage
chicken sperm antioxidant lipid peroxidation
2016/1/29
Liquid or frozen storage of poultry semen negatively affects the sperm motility and has crucial role in reducing fertility. Phospholipids in chicken sperm membrane are composed of high proportions of ...
Caste/Ethnic Differential Fertility Transitions in Nepal: Whose Fertility Declined Faster?
Differential fertility Health Surveys
2016/1/28
This paper attempts to examine the determining factors on intention for abstinence
from sex before marriage among youth (15‐24 years) in Nepal among those who have
had no sexual experience. The bina...