Poultry production at all scales of operation is wholly dependent on the supply day-old chicks. Two important factors that have a significant impact chicks are fertility and hatchability. Hatchability proportion fertile eggs actually hatch, whereas refers to incubated. Understanding elements affect hatchability important. Breeds, diet, age hens, environmental stress, egg weight, shell thickness...

Declining fertility in developed countries along with rising number of immigrants and different fertility behavior exhibited by the immigrants make the immigrants' fertility an interesting topic in field of demography. However most of the studies on immigrants' fertility consider the female immigrants as their subject on the assumption that they represent the immigrants' fertility. This study t...

Fertility is fundamental to reproductive success, but not all copulation attempts result in a fertilized embryo. Fertilization failure especially costly for females, we still lack clear understanding of the causes variation female fertility across taxa. Birds make useful model system research, partly because their large eggs are easily studied outside female's body, also wealth data available o...

This paper has three major objectives. The first is to demonstrate that a sustained fertility transition has begun in Nigeria. The second is to identify some factors that might have contributed to the decline and the third objective is to argue in favor of further declines in fertility and propose a level of fertility by the time the fertility transition is completed. None of the objectives is ...

Using West German panel data constructed from the 1988 and 1994/95 wave of the DJI Familiensurvey, we analyze the stability and determinants of individuals’ total desired fertility. We find considerable variation of total desired fertility across respondents and across interviews. In particular, up to 50% of individuals report a different total desired fertility across survey waves. Multivariat...