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Study of the metabolism of broiler chicks in the perinatal period: effects of hypercapnic incubation and of feed factors in interaction with hatching time KU Leuven
De perinatale periode van het vleeskuiken, beschouwd als de periode van embryonale dag 16 tot dag 7 van de opgroeiperiode, is de belangrijkste periode in het leven van het vleeskuiken aangezien het in die periode enorme metabolische en fysiologische veranderingen ondergaat: de overgang van poikilothermie naar homeothermie, de omschakeling van de vetrijke dooier naar een koolhydratenrijk dieet, de start van de longademhaling en het stresserende ...
Effect of pre-incubation and incubation conditions on hatchability, hatch time and hatch window, and effect of post-hatch handling on chick quality at placement KU Leuven
The zootechnical performances of broilers at the end of the rearing period depend in part on the quality of day-old chicks at placement. The quality of day-old chicks is highly affected by the incubation conditions, by hatch time (which determines the time spent in the hatcher under high temperature and humidity), and by the handling of chicks after hatch. This article first presents an overview of the most relevant pre-incubation factors that ...
Effect of incubation time of three single extraction procedures on trace element extraction from sediment and soil University of Antwerp
The use of standard single-extraction procedures to evaluate the mobility and availability of trace elements is a common practice in most laboratories dealing with soil or sediment analysis. Most standard single-extraction procedures describe incubations last for 2 h. However, these were tested and validated for soil analysis. Applying them for sediment analysis without further investigation might be misleading and should be reviewed with care. ...
Is the reduced incubation time for B-eggs in Rockhopper Penguins **Eudyptes chrysocome** linked to egg density variation? University of Antwerp
Crested penguins (genus Eudyptes) present a unique reversed egg-size dimorphism and hatching asynchrony, with the larger second-laid egg (B-egg) hatching before the smaller first-laid egg (A-egg). Both a higher water vapour conductance and parental favouritism during incubation could explain the shorter incubation period for the B-egg than for the A-egg. Because the incubation period is increased by the presence of a sibling for A-eggs, but not ...
Higher levels of CO2 during late incubation alter the hatch time of chicken embryos KU Leuven
1. It has been reported that the increasing CO2 tension triggers the embryo to pip the air cell and emerge from the egg. However, the mechanism by which higher CO2 concentrations during the last few days of incubation affect chick physiology and the hatching process is unclear. This study investigated the effect of CO2 concentrations up to 1% during pipping, on the onset and length of the hatch window (HW) and chick quality. 2. Four batches of ...