Egg Composition in Some Australian Birds

1990 ◽  
Vol 90 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Alan Lill ◽  
Peter J. Fell
Keyword(s):  
Australian Birds ◽  
Egg Composition

scholarly journals The Bird Assemblage of the Darwin Region (Australia): What Is the Effect of Twenty Years of Increasing Urbanisation?

Diversity ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 294
Author(s):  
Sarah E. Fischer ◽  
Andrew C. Edwards ◽  
Patrice Weber ◽  
Stephen T. Garnett ◽  
Timothy G. Whiteside
Keyword(s):  
Urban Development ◽  
Bird Community ◽  
Feeding Guilds ◽  
Australian Birds ◽  
Bird Survey ◽  
Species Analysis ◽  
Community Data ◽  
Bird Assemblage ◽  
Significant Change ◽  
The Difference

There has been considerable urban development in the Darwin region over the last twenty years; as for most fauna in Australia since colonisation, the potential effects to the bird assemblage were expected to be disastrous. To provide a broad overview of changes, bird survey data from 1998 and 2018 were extracted from BirdLife Australia’s ‘Atlas of Australian Birds’ database. A total of 165 species were categorised into primary food source feeding guilds and levels of food specialisation. This was integrated into ArcGIS along with land use change mapping from 1998 and 2018 to investigate its impact on bird assemblages. There was no significant change in overall species numbers when all sites were analysed. However, when sites were separated into those with increased urbanisation or decreased greenspace, several sites showed a significant change in the number of species. For the majority of species, analysis of primary food types found no difference in the proportion of species within the assemblages between 1998 and 2018, regardless of the level of urbanisation or greenspace; the exception being those species that primarily feed on insects, where the difference was just significant. An analysis using bird community data sorted into levels of food specialisation also found no difference between 1998 and 2018 despite habitat changes. These findings suggest that although there has been considerable urban development in the Darwin region, bird communities are remaining relatively stable.

The Food of Australian Birds

1936 ◽  
Vol 35 (3) ◽  
pp. 251-280 ◽  
Author(s):  
A. H. Lea ◽  
J. T. Gray
Keyword(s):  
Australian Birds

The relationship between ecology and the incidence of cooperative breeding in Australian birds

1988 ◽  
Vol 22 (4) ◽  
pp. 239-249 ◽  
Author(s):  
Hugh A. Ford ◽  
Harry Bell ◽  
Ray Nias ◽  
Richard Noske
Keyword(s):  
Cooperative Breeding ◽  
Australian Birds ◽  
The Relationship

Short sketches from the long history of cooperative breeding in Australian birds

2002 ◽  
Vol 102 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Christopher R. J. Boland ◽  
Andrew Cockburn
Keyword(s):  
Cooperative Breeding ◽  
Australian Birds ◽  
History Of

Effect of dietary lutein and flax on performance, egg composition and liver status of laying hens

2007 ◽  
Vol 87 (3) ◽  
pp. 365-372 ◽  
Author(s):  
S. Leeson ◽  
L. Caston ◽  
H. Namkung
Keyword(s):  
Laying Hens ◽  
Age Related Macular Degeneration ◽  
Liver Fat ◽  
Age Related ◽  
Long Term Effect ◽  
Early Production ◽  
Egg Composition ◽  
Lutein Content ◽  
Feeding Diets

Lutein is considered a protective nutrient against age-related macular degeneration in humans. An experiment was designed to study the long-term effect of feeding lutein in combination with flaxseed on layer performance, egg parameters, and lutein deposition in eggs and tissues. Laying hens were fed diets with 0 or 10% flax supplemented with 0, 125 or 250 ppm lutein for 11 consecutive 28-d periods beginning at 18 wk of age. Early production was reduced (P < 0.01) by feeding diets with 10% flax and when supplemented with 250 ppm lutein. Diet treatments had no effect on feed intake, egg weight or eggshell deformation. Addition of lutein to the diets significantly (P < 0.01) increased yolk color, and lutein content in the egg, liver, and the preen gland. Egg lutein content increased (P < 0.01) from a basal level of 0.10 mg to 1.60 mg 60g-1 egg by addition of lutein to the diet. Liver fat was lower (P < 0.05) in hens fed 10% flaxseed. Liver hemorrhage score was dramatically reduced (P < 0.01) in birds fed lutein. Key words: egg composition, flaxseed, lutein, layers

Sign in / Sign up

Export Citation Format

Share Document