15 1. It has been reported that the increasing CO2 tension triggers the embryo to pip the air cell and 16 emerge from the egg. However, the mechanism by which higher CO2 concentrations during the 17 last few days of incubation affect chick physiology and the hatching process is unclear. This study 18 investigates the effect of CO2 concentrations up to 1% during pipping, on the onset and length ...

AIM The present experiment was conducted to study the effect of post hatch dietary fat supplementation on performance of broiler chicken. MATERIALS AND METHODS A total of 120 day-old Ven Cobb broiler chicks were randomly assigned to 4 treatment groups of 30 chicks in each (three replicates of 10 birds/treatment). The trial lasted for 35 days. The experimental design was a completely randomize...

The need to understand chemical uptake, distribution, and metabolism in embryonic and larval fish derives from the fact that these early life stages often exhibit greater sensitivity to xenobiotic compounds than do adult animals. In this study, a 6-h acute waterborne exposure immediately after fertilization was used to quickly load the egg with benzo[a]pyrene (BaP). This exposure was used to mi...

We investigated the effects of Heterodera glycines cyst components and surface disinfestants on hatching of H. glycines eggs in vitro. Eggs were incubated in either H. glycines cyst wall fragments, cyst wall and egg rinsate, egg homogenate, or control solutions of soybean root diffusate, sterile distilled water, or zinc sulfate. Hatch in cyst wall and egg rinsate, and egg homogenate, was greate...

Identifying the sources of variation in traits of larvae is one of the first steps in interpreting the role of phenotypic variation in recruitment. We examined the contributions of geographic source and parentage to phenotypic variation in offspring traits in a gadid, Microgadus tomcod, from 2 contrasting yet nearby locations. Adults were collected from the Hudson River (HR), a polluted riverin...

objective: the objective of this study was to investigate the pathological alterations of methionine for chicken embryo.in recent years, amino acids are used in veterinary medicine for many purposes. they injected into hatching eggs to increase chick body weight and performance at hatch, but the adverse effects of amino acids have always been a major concern. there is scant information availabl...

This study was performed to determine the effect of hatching system (house and hatcher) egg weight (heavy light) on pip-hatch time, hatchability some gosling quality traits. A total 389 eggs (fertile candling) from 2-year-old Turkish Native Goose were used in study. Before incubation process, all individually numbered weighed. Eggs divided into heavy (≥160 g) light (