Deep semen deposition, avoiding retrograde flow, lesions and stress, has proved to be very important in the success of sheep AI. The objective of the present study was to develop a new, suitable anti-retrograde flow device for sheep cervical AI (DARIO) that enables deep deposition of semen into the cervix without any modifications to the procedures currently used, and to compare the fertility, ...

A global branch of positive cycles is shown to exist for a general discrete time, juvenile-adult model with periodically varying coefficients. The branch bifurcates from the extinction state at a critical value of the mean, inherent fertility rate. In comparison to the autonomous system with the same mean fertility rate, the critical bifurcation value can either increase or decrease with the in...

In a context where 46 countries now consider their fertility rate to be too low, attention is turning to the need for policy actions to increase fertility rates. This article discusses the reasons why action is required and why countries have been slow to take policy action. It then considers a wide range of possible policies and assesses them against a set of eleven social policy principles. T...

OBJECTIVE To investigate the effect of fibroids on fertility and of myomectomy in improving outcomes. DESIGN Systematic literature review and meta-analysis of existing controlled studies. SETTING Private center for Reproductive endocrinology and infertility. PATIENT(S) Women with fibroids and infertility. INTERVENTION(S) A systematic literature review, raw data extraction and data analy...

Births According to provisional reports, an estimated 307,000 births occurred in the United States during March 1997. This was a decrease of 8 percent from the provisional number of births reported for March 1996 (334,000). The birth rate, 13.6 live births per 1,000 population, was 9 percent lower than the rate of 14.9 for March 1996. The fertility rate, 60.7 live births per 1,000 women ages 15...

The research aims to provide a closer look at the relationship between economic factors and fertility rate in Philippines. will be based on models of written by Davis Blake 1956. researchers used variables Gross Domestic Product, Female Unemployment Rate, Male Inflation Rate as independent saw these with Fertility Rate. results regression analysis show significant variables, having positive bet...

The author argues that the effect of sex preference must be disentangled from the effect of number preference in Korea. This study tests--with hazard models--the effect of the number of previous children on the next birth according to the sex composition of previous children. Data were obtained from the 1974 Korean Fertility Survey. This paper also analyzes the timing of childbearing in rece...

This study was undertaken to determine the effects of storage period and egg weight of hatching eggs of Japanese quails on fertility, hatchability results. Eggs were obtained 150 females quails, all at 15 weeks of age. A total of 1942 hatching eggs were separated into 3 groups as light-weight (9.50-10.50 g), medium-weight (10.5111.50 g), and heavy-weight (11.51-12.50 g). Based on storage period...

BACKGROUND Estimating the total fertility rate is challenging for many developing countries because of limited data and varying data quality. A standardized, reproducible approach to produce estimates that include an uncertainty assessment is desired. METHODS We develop a method to estimate and assess uncertainty in the total fertility rate over time, based on multiple imperfect observations ...

Semen quality and its relationship to fertility are major concern in animal production. The aim of this study was to assess the relationship between frozen thawed sperm characteristics and fertility following in vivo fertility through Artificial Insemination(AI). Semen samples were collected from four buffalo bulls. Semen volume and sperm concentration appeared to be significantly different (P0...