scholarly journals Tracing Mathematical Function of Age Specific Fertility Rate in Peninsular Malaysia

2018 ◽  
Vol 9 (3) ◽  
pp. 637
Author(s):  
Norsyela Muhammad Noor Mathivanan ◽  
Puzziawati Ab Ghani ◽  
Nor Azura Md.Ghani
Keyword(s):  
Mathematical Model ◽  
Size Structure ◽  
Peninsular Malaysia ◽  
Fertility Rate ◽  
Population Projections ◽  
Mathematical Function ◽  
Fertility Schedule ◽  
Fertility Rates ◽  
Early 21St Century ◽  
Fertility Data

<p>The size, structure, and composition of a population are affected by the fertility rates at any point of time. Many researchers took the opportunity to exploit the fertility rates in obtaining better fertility patterns for their country. The curve for the age specific fertility rate is consistent, and this feature allows the curve to be matched with a mathematical model. This paper aimed to identify the best mathematical model that fits the recent age specific fertility rate in Peninsular Malaysia. This study fitted the fertility data of Peninsular Malaysia from 1996 to 2014 to the four mathematical models, which were Hadwiger, Gamma, Beta, and Gompertz models. From the comparisons of the four models, it was found that the best fitted mathematical model is Hadwiger model. In relation to the data of early 21st century, there was an inclination for the best fitted mathematical model from Hadwiger model to Beta model. Hence, the best mathematical model for each year can be used to convert a fertility schedule classified in a five-year age group into a fertility schedule for a single-year of age in Peninsular Malaysia. This model also can be helpful for population projections by using limited and defective data. </p>

scholarly journals 311 CATTLE SEX REGULATION BY SEPARATION OF X AND Y SPERMATOZOA PRELIMINARY RESULTS OF FIELD EXPERIMENT IN POLAND

2005 ◽  
Vol 17 (2) ◽  
pp. 306
Author(s):  
Z. Smorag ◽  
M. Bochenek ◽  
J. Pilch
Keyword(s):  
Field Experiment ◽  
High Speed ◽  
Fertility Rate ◽  
Fast Method ◽  
Fertility Rates ◽  
Fort Collins ◽  
Fertility Data ◽  
Holstein Bulls ◽  
Sex Regulation ◽  
Average Fertility

The only reliable and relatively fast method of sex regulation in cattle is X and Y sperm high-speed sorting by flow cytometry. In October 2003 a field experiment started in Poland. The aim of the experiment was to examine the efficiency of sperm sexing and the fertility rate in field conditions. The semen of three Holstein bulls was used for the experiment. The semen was sexed and frozen according to modified XY, Inc. (Fort Collins, CO, USA) method. Only the X-fraction of spermatozoa was sorted and frozen. Sexing was performed at a speed of 15–20 × 106 spermatozoa/h and frozen in doses of 2.5 × 106 spermatozoa/straw. Progressive motility of spermatozoa was 90–95% immediately after sorting and 50–70% after freezeing/thawing for all three bulls. The X-fraction sorting purity was checked by re-analysis and it ranged from 90% to 96%. In total, 316 inseminations at 10 farms were performed up to June 2004. Fertility data of 178 inseminations were collected by ultrasonographic (USG) examination during the same time. Average fertility rate was 37.08%. However, significant variations of fertility rates were observed between farms: it ranged from 22.22% to 84.21%. Four calves, all females, were born after insemination with the X-fraction until June 2004. The experiment will continue.

Differential fertility among immigrants to England and Wales and some implications for population projections

1969 ◽  
Vol 1 (S1) ◽  
pp. 119-127 ◽  
Author(s):  
Jean Thompson
Keyword(s):  
Age Structure ◽  
Age Groups ◽  
Population Projections ◽  
Fertility Rates ◽  
Female Population ◽  
Differential Fertility ◽  
England And Wales ◽  
Adult Age ◽  
Completed Family Size ◽  
Socio Economic Factors

SummaryThe age structure of the immigrant female population as shown by the 1961 Census was heavily biased towards the young adult age groups, where fertility rates are highest. The birth rate for such a population could be expected considerably to exceed the average for this country as a whole, due to differences in age structure alone. The Census also showed marked differences betwen the fertility rates of different groups of immigrants but suggested that for the most important groups —from the Irish Republic, the Indian sub-continent and the Caribbean—they then amounted to a completed family size of roughly ½ child above the England and Wales average. There were also marked differences in 1961 between the socio-economic structure of immigrant groups; such evidence as there is points to socio-economic factors as playing an important part in explaining the fertility of immigrants, and its possible change over time.

scholarly journals Fertility rates and the postponement of first births: a descriptive study with Finnish population data

BMJ Open ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. e026336 ◽  
Author(s):  
Zahra Roustaei ◽  
Sari Räisänen ◽  
Mika Gissler ◽  
Seppo Heinonen
Keyword(s):  
Total Fertility Rate ◽  
Population Data ◽  
Population Based ◽  
Fertility Rate ◽  
Age At First Birth ◽  
Fertility Rates ◽  
First Birth ◽  
Educational Levels ◽  
The Mean ◽  
The Impact

ObjectivesWe described the trend of fertility rates, age-specific fertility rates and associated factors in Finland over a 30-year period.DesignA descriptive population-based register study.SettingFertility data, including age at first birth, childlessness and educational levels were gathered from the Finnish Medical Birth Register and Statistics Finland.ParticipantsAll 1 792 792 live births from 1987 to 2016 in Finland.Main outcome measuresCompleted fertility rate, total fertility rate and age-specific fertility rate.ResultsThe total fertility rate of Finnish women fluctuated substantially from 1987 to 2016. Since 2010, the total fertility rate has gradually declined and reached the lowest during the study period in 2016: 1.57 children per woman. The mean maternal age at first birth rose by 2.5 years from 26.5 years in 1987 to 29 years in 2016. The proportion of childless women at the age of 50 years increased from 13.6% in 1989 to 19.6% in 2016. By considering the impact of postponement and childlessness, the effect on total fertility rates was between −0.01 and −0.12 points. Since 1987, the distribution of birth has declined for women under the age of 29 and increased for women aged 30 or more. However, start of childbearing after the age of 30 years was related to the completed fertility rate of less than two children per woman. The difference in completed fertility rate across educational groups was small.ConclusionsPostponement of first births was followed by decline in completed fertility rate. Increasing rate of childlessness, besides the mean age at first birth, was an important determinant for declined fertility rates, but the relation between women’s educational levels and the completed fertility rate was relatively weak.

scholarly journals Fertility dynamics and reproductive behaviour of men and women entering into marriage in the Republic of Bashkortostan

2021 ◽  
Vol 5 (2) ◽  
pp. 55-75
Author(s):  
Yana A. Skryabina
Keyword(s):  
Reproductive Behaviour ◽  
Fertility Rate ◽  
Low Fertility ◽  
Reproduction Rate ◽  
Fertility Rates ◽  
Expected Number ◽  
Number Of Children ◽  
Reproductive Intentions ◽  
Republic Of Bashkortostan ◽  
The Republic

The article is devoted to the analysis of the fertility rate dynamics in the Republic of Bashkortostan and the study of the reproductive behaviour of the population entering into a registered marriage. The author examines the crude and total fertility rates, the net population reproduction rate, the total fertility rate by the order of births, as well as age-specific fertility rates. In addition, basing on the data of population surveys, the author regards reproductive intentions of citizens applying for marriage in the registry office, as well as reasons that may prevent them from having a child. The study shows that the Republic of Bashkortostan is characterized by a low fertility rate; the generation of children does not replace the generation of parents. The reproductive intentions of the respondents measured by the desired and expected number of children correspond to the small (two-child) family model. Among the main reasons that can prevent the birth of a child, the first two are financial and housing difficulties, and third is the desire to live for oneself for a while.

scholarly journals In the name of the father? Fertility, religion and child naming in the demographic transition

2021 ◽  
Author(s):  
Dylan Connor
Keyword(s):  
Married Couples ◽  
Detailed Examination ◽  
Fertility Rate ◽  
High Fertility ◽  
Fertility Rates ◽  
Religious Influences ◽  
High Fertility Rate ◽  
Key Factor ◽  
The Impact

This article shows that parents reveal information about their fertility behavior through how they name their children. I arrive at this finding from detailed examination of the net fertility of 130,000 married couples in Ireland circa 1910, a country known for its historically high fertility rate. After stringently accounting for the occupation, religion and location of couples, I find higher fertility rates among couples who chose distinctly Catholic names and traditional names for their children, with the latter being particularly important. Exposure to towns and cities lowered net fertility and weakened preferences for traditional and Catholic names. Cumulatively, these findings highlight the role of traditional rural norms over explicitly religious influences in driving high fertility rates in Ireland. The impact of towns and cities in reducing net fertility suggests that Ireland’s sluggish urbanization was a key factor in its high historical fertility rate.

Recent evidence on trends and differentials in Bangladesh fertility: an update

1994 ◽  
Vol 26 (2) ◽  
pp. 235-241 ◽  
Author(s):  
R. Amin ◽  
A. Ahmed ◽  
J. Chowdhury ◽  
M. Kabir ◽  
R. Hill
Keyword(s):  
Educational Level ◽  
Marital Fertility ◽  
Fertility Rate ◽  
Rural Residents ◽  
Educational Differences ◽  
Urban Rural ◽  
Fertility Data ◽  
Rural Locality ◽  
Marital Fertility Rate

SummaryA comparison of contraceptive and fertility data for 1985–91 with data for 1983 shows that fertility has continued to decline in Bangladesh, in all segments of society. The magnitude of decline varied according to educational level, region and urban–rural locality. The percentage decline in total marital fertility rate was somewhat higher among urban than rural residents; educated women showed greater declines than uneducated, increas-ing the overall educational differences in total fertility by 1991. Factors contributing to the recent decline in fertility are discussed.

scholarly journals Trends in fertility rates, proportion of antenatal consultations and caesarean sections among Brazilian adolescents

2021 ◽  
Vol 74 (suppl 4) ◽  
Author(s):  
Milena Laryssa Costa Bicalho ◽  
Fernanda Gontijo Araújo ◽  
Gisele Nepomuceno de Andrade ◽  
Eunice Francisca Martins ◽  
Mariana Santos Felisbino-Mendes
Keyword(s):  
Antenatal Care ◽  
Regression Model ◽  
Trend Analysis ◽  
Temporal Trends ◽  
Fertility Rate ◽  
Percentage Change ◽  
Annual Percentage Change ◽  
Fertility Rates ◽  
Increasing Trend ◽  
Using Data

ABSTRACT Objective: To analyze the temporal trends in the fertility rate, proportion of antenatal consultations and caesarean sections in Brazilian adolescents aged 15 to 19, between 2000 and 2015. Methods: The fertility rate, proportion of prenatal consultations and proportion of routes of birth were calculated using data from DATASUS. The trend analysis was performed using the Prais-Winsten regression model and the annual percentage change. Results: There was a trend of reduction of 3.5% per year in the fertility rate among adolescents (p<0.05), in addition to an increasing trend of 6% per year in the proportion of more than six antenatal consultations (p <0.0001) and an increasing trend of 6.8% per year in the proportion of caesarean sections (p<0.0001). Conclusion: Despite the decreasing trend in fertility rates among Brazilian adolescents, they remain high. Also noteworthy is the growing trend for caesarean sections, even with improved access to antenatal care.

scholarly journals In the Name of the Father? Fertility, Religion, and Child Naming in the Demographic Transition

Demography ◽  
2021 ◽  
Vol 58 (5) ◽  
pp. 1793-1815
Author(s):  
Dylan Shane Connor
Keyword(s):  
Married Couples ◽  
Detailed Examination ◽  
Fertility Rate ◽  
High Fertility ◽  
Fertility Rates ◽  
Religious Influences ◽  
High Fertility Rate ◽  
Key Factor ◽  
The Impact

Abstract This article shows that parents reveal information about their fertility behavior through how they name their children. I arrive at this finding from a detailed examination of the net fertility of 130,000 married couples in Ireland, a country known for its historically high fertility rate, circa 1911. After stringently accounting for couples' occupation, religion, and location, I find higher fertility rates among couples who chose distinctly Catholic names and traditional names for their children, with the latter being particularly important. Exposure to towns and cities lowered net fertility and weakened preferences for traditional and Catholic names. Cumulatively, these findings highlight the role of traditional rural norms over explicitly religious influences in driving high fertility rates in Ireland. The impact of towns and cities in reducing net fertility suggests that Ireland's sluggish urbanization was a key factor in its high historical fertility rate.

Fertility of ewes treated with prostaglandin F2α and artificially inseminated at predetermined intervals thereafter

1977 ◽  
Vol 28 (5) ◽  
pp. 891 ◽  
Author(s):  
Y Fukui ◽  
EM Roberts
Keyword(s):  
Intramuscular Injection ◽  
Single Injection ◽  
Prostaglandin F2α ◽  
Fertility Rate ◽  
Fertility Rates ◽  
Single Intramuscular Injection ◽  
Subsequent Fertility

An experiment was conducted to investigate the fertility rate in ewes inseminated with either fresh undiluted or frozen-thawed ram semen, without the use of vasectomized rams, at the first synchronized oestrus after a single intramuscular injection of 16 mg prostaglandin F2α (PGF2α). It was also investigated whether two injections of PGF2α at an interval of 12 days would improve the degree of synchronization of oestrus and the subsequent fertility. The degree of synchronized oestrus with two injections was similar to that with a single injection (72%v. 74% respectively). Inseminations at 46 and 54 hr or at 70 and 78 hr after treatment showed fertility comparable with that from those inseminations at oestrus detected by vasectomized rams (50% v. 45% for fresh undiluted semen and 22% v. 25% for frozen-thawed semen respectively). Inseminations at 70 and 78 hr after treatment showed a much higher fertility rate for both fresh undiluted (62% v. 39% respectively) and frozen-thawed semen (39% v. 9% respectively) than inseminations at 46 and 54 hr. Two injections of PGF2α resulted in similar fertility rates in control ewes following insemination with either fresh undiluted semen (50%) or frozen-thawed semen (22%).

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