Results 131 to 140 of about 832 (173)

The erection mechanism of the ratite penis

Journal of Zoology, 2011
AbstractThe erection mechanism of the penis in most vertebrates is blood vascular. A major evolutionary transition occurred in birds, where the erection mechanism changed from blood vascular to lymphatic. Within birds, however, the erection mechanism of the ratite penis has remained unknown.
P. L. R. Brennan, R. O. Prum
openaire   +1 more source

Ratites and tinamous (Paleognathae)

2009
Abstract The Superorder Paleognathae consists of the Pightless ratites and the volant tinamous. It is the closest relative of the remaining birds in the Superorder Neognathae. Ratites are named for their raJ-like (ratis) sternum that lacks a keel, whereas the tinamous have a keeled sternum.
Allan J Baker, Sérgio L Pereiraa
openaire   +1 more source

The Structure and Sensory Innervation of the Integument of Ratites

2011
This chapter reviews the microanatomy and innervation of the integument of the ostrich and the emu. We consider how these structures enable ratites to interact with their environment and how damage to the skin may compromise the welfare of the birds. The skins of the ostrich and the emu are structurally very similar.
Weir K. A., Lunam C. A.
openaire   +3 more sources

Ratites: Biology, Housing, and Management

2004
The large flightless ostrich, emu, cassowary, and rhea, and the small flightless kiwi, compose the ratite family. The emu, ostrich, and rhea have been used in farming systems in which their biology influences management and housing. Ratite farming is in its infancy and requires further research and development to overcome inherent constraints before ...
Dominique Blache, Graeme B. Martin, Irek Malecki   +2 more
openaire   +1 more source

The Welfare of Farmed Ratites

2011
Phil Glatz, Christine Lunam, Irek Malecki (editors)
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On the rarity of ratite hybridization

Emu - Austral Ornithology
Although an estimated 10–20% of bird species are known to hybridise, research on avian hybridisation is strongly biased towards certain groups, leaving others understudied. Hybridisation in ratites–a polyphyletic group of flightless birds including ostriches, rheas, cassowaries, emus, and kiwi–has received little attention, largely due to its apparent ...
openaire   +2 more sources

Ratite diagnostic imaging.

The Veterinary clinics of North America. Food animal practice, 1999
Diagnostic imaging of ratite species is a challenge, even to the specialist. A portable radiography unit is frequently inadequate to penetrate the coelomic cavity of large birds, but should provide diagnostic quality radiographs of the extremities. Ultrasonography allows visualization of the coelomic structures, but will not penetrate gas or air.
openaire   +1 more source

Sexing ratites

International Zoo Yearbook, 1974
SAM E. WEEKS, MITCHELL BUSH
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Ratite Nutrition and Feeding [PDF]

, 2014
There is limited quality research concerning the nutritional requirements of Ratites. However, some dependable guidelines have been established because of work completed in Australia and Africa.
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An updated look at the mating system, parental care and androgen seasonal variations in ratites

General and Comparative Endocrinology, 2022
Diego J Valdez
exaly