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 (

Hypothesis: Phenotypic variation in traits induced by different incubation temperatures does not persist into the lifetime of young lizards, and therefore contributes little to variation in long-term fitness. Organism: Western fence lizard (Sceloporus occidentalis). Methods: Split-clutch laboratory incubation experiment including eggs from two different populations under two different incubatio...

Incubation is a vital component of reproduction and parental care in birds. Maintaining temperatures within a narrow range is necessary for embryonic development and hatching of young, and exposure to both high and low temperatures can be lethal to embryos. Although it is widely recognized that temperature is important for hatching success, little is known about how variation in incubation temp...

A single meal soon after hatching can reverberate through a lizard's entire life. More generally, events early in life may outweigh genetic factors in fashioning an organism's life history traits.

Metamorphosis is thought to provide an adaptive decoupling between traits specialized for each life-history stage in species with complex life cycles. However, an increasing number of studies are finding that larval traits can carry-over to influence postmetamorphic performance, suggesting that these life-history stages may not be free to evolve independently of each other. We used a phenotypic...

If male sexual signalling is honest because it captures genetic variation in condition then traits that are important mate choice cues should be disproportionately affected by inbreeding relative to other traits. To test this, we investigated the effect of brother-sister mating on advertisement calling by male field crickets Teleogryllus commodus. We quantified the effect of one generation of i...

Sibling competition has been proposed as an important evolutionary pressure driving interspecific variation in developmental rates. We tested this hypothesis using rates of extra-pair paternity and brood parasitism, as well as the degree of hatching asynchrony, as indices of sibling competition in a comparative analysis of 70 species of bird. We found mixed support for the influence of sibling ...

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...

Molecular marker selection has been an acceptable tool in the acceleration of the genetic response of desired traits to improve production performance in chickens. The crossbreds from commercial parent stock (PS) broilers with four Thai synthetic breeds; Kaen Thong (KT), Khai Mook Esarn (KM), Soi Nin (SN), and Soi Pet (SP) were used to study the association among chicken growth hormones (cGH) a...