Fertility rate is one of the most important global indexes. Past researchers found models which fit to age-specific fertility rates. For example, mixture probability density functions have been proposed for situations with bi-modal fertility patterns. This model is less useful for unimodal age-specific fertility rate patterns, so a model based on skew-symmetric (skew-normal) pdf was proposed by...

Recently, borage (Borago officinalis L. Boraginaceae) has been the subject of increasing agricultural interest because of the potential market for gamma linolenic acid (GLA), an unusual fatty acid extracted from the oil seed. GLA is an omega-6 essential fatty acid which has been identified as having several beneficial properties. Increased interest in production of the crop in western Canada ha...

To comprehend the distribution characteristics of nutrients and variations in soil fertility, a total 23 samples were collected from Nanjishan wetland reserve dry season, wet water-recession season. The study area was divided into four areas (A1, A2, A3, A4) based on local hydrological conditions, geographical locations, nutrient load characteristics. findings showed that highest concentration ...

AIM This research was conducted to determine the most affecting parameters on hatchability of indigenous and improved local chickens' eggs. MATERIALS AND METHODS Five parameters were studied (fertility, early and late embryonic mortalities, shape index, egg weight, and egg weight loss) on four strains, namely Fayoumi, Alexandria, Matrouh, and Montazah. Multiple linear regression was performed...

Practical techniques for assessing semen quality in order to predict male fertility are still needed. The principal objective of this experiment was to evaluate routine laboratory evaluation and in vitro fertilization (IVF) techniques as predictors of relative boar fertility using a low-dose AI protocol. Nine boars were evaluated during a 6.5+/-1 mo period, beginning at 29-32 wk of age. Ejacula...

The aim of this study was to estimate genetic parameters for female fertility and production traits in first-parity Czech Holstein cows and to quantify the effect of using this information on the accuracy of a selection index in seven different scenarios. In order to estimate genetic (co)variance components, the DMU software running an AI-REML algorithm was used. The analyses were made using a ...

Previous literature has shown that land use regulations influence where people choose to live within the U.S. by impacting housing prices. In this paper, we study the impact of these same regulations on another component of population growth, fertility rates. First, we employ a dataset on the stringency of land restrictions using court based measures created by Ganong and Shoag (2017). We add t...