The data were collected from 1992 to 2009 in Burri, White Boni and Black Boni sheep maintained at the Regional Research Station in the Central Highlands of Yemen. Data were analyzed to study the effects of environmental and genetic factors on body weight and growth rate from birth to weaning. The least square means for body weights (BW) were 2.54, 2.18 and 2.26 kg for birth; 12.49, 10.58 and 11...

The distribution of birth rates was examined in 668 schizophrenic patients born in Réunion, a tropical French island in the Southern Hemisphere, and compared with that in the general local population. We failed to observe a significant season-of-birth effect, either in the total sample of schizophrenic patients or in subgroups categorized by gender, age, or family history of schizophrenia. Seas...

The development of population policy and health legislation as a result of government, the need for more young, healthy, working and military active population, resulted in the education of all health workers including midwives, legal regulation of their work, increasing their number and training of midwifery profession. With the development of this profession conditions of women giving birth, ...

The incidence of twin births in Accra and Kumasi, the two major cities in Ghana, was investigated. In Accra, data were collected from the Korle-Bu Teaching Hospital while data were collected and analyzed from the Komfo Anokye Teaching Hospital in Kumasi. Both hospitals are the leading teaching hospitals in Ghana. The data consisted mainly of single and twin births recorded in the hospitals over...

BACKGROUND In recent years, particularly in developed countries, women have tended to delay childbirth until over 40 years of age. Our study aims to identify whether the donor's age or recipient's age influences the pregnancy and live birth rate following oocyte recipient cycles. METHODS A population study included 3889 fresh oocyte recipient cycles. Pregnancy and live delivery rates were com...

BACKGROUND During the last decades there has been a steady increase of twin births. A combination of improved medical treatment of preterm and small-for-gestational age children has contributed to a higher number of surviving twins. Prematurity is known to affect reproduction in a negative way. Few studies have focused on the potential effect twinning may have on future reproduction. Thus, the ...

The payment of child allowances to laborers with large families was widespread in early nineteenth-century England. This paper tests Thomas Malthus's hypothesis that child allowances caused the birth rate to increase. A cross-sectional regression model is estimated to explain variations in birth rates across parishes in 1826-30. Birth rates are found to be related to child allowances, income, a...

The analysis was based on the 1994 Zimbabwe Demographic and Health Survey combined with aggregate data from the 1992 census. Discrete-time hazard models for first and higher-order births were estimated for 1990-94. The average length of education in the district and the proportion who are literate were found to have no impact on a woman's birth rate above and beyond that of her own education, ...

BACKGROUND Chile is in the advanced stage of demographic transition with a low natural growth and a progressively aging population. AIM To analyze births by range of maternal age and to establish if population aging is expressed in the women's fertile age range. MATERIAL AND METHODS Trend analysis of births and age-specific birth rates in the period 1990-2004, in the Chilean women populatio...

BACKGROUND The proportion of male births has been shown to be over 50% in temperate climates around the world. Given that fluctuations in ambient temperature have previously been shown to affect sex allocation in humans, we examined the hypothesis that ambient temperature predicts fluctuations in the proportion of male births in New Zealand. METHODOLOGY/PRINCIPAL FINDINGS We tested three main...