Hides Black

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A Afsar

Islamic Azad University of Varamin

Juan M. Busso

Universidad Nacional de Córdoba

Khalil Nazih Yazbeck

Shinshu University

Elizabeth Silva

Appalachian State University

Ronald M. Lindsay

Shinshu University

D. Narahari

Tamil Nadu Veterinary and Animal Sciences University

Dirk U. Bellstedt

Stellenbosch University

Darin C. Bennett

California Polytechnic State University

Wolfgang Bürger

Sozialwissenschaftliche Forschung und Beratung

Christopher T. Minson

University of Oregon

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Shinshu University

Stellenbosch University

University of British Columbia

Animal Production Institute

Tamil Nadu Veterinary and Animal Sciences University

University of Western Australia

Universidad Nacional de Córdoba

Universidade Estadual Paulista (Unesp)

Consejo Nacional de Investigaciones Científicas y Técnicas

University of Worcester

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One-page papers from the 4th IRS Symposium 2008

Australian Journal of Experimental Agriculture (2008)

Darin C. Bennett Yutaka Karasawa Pinholes Ostrich Hides Black P. C. Glatz

Ostriches are the largest living birds and are endemic to hot arid and semi-arid climates.Their kidneys are relatively large and can produce concentrated urine, but no detailed renal studies have been conducted.In mammals, a high protein diet increases both glomerular filtration rate (GFR) and urine flow rate (UFR).Three adult female ostriches (mean body mass 108 kg) were fed four pelleted diets containing 1.2 to 2.4 % N (7.5-15 % CP).Each trial consisted of 10-day adaptation, followed by a 6-day period during which all excreta was collected.Creatinine concentration of the plasma ([Cr] pl ), urine ([Cr] u ) and excreta were measured.GFR was calculated as the total daily excreted creatinine divided by [Cr] pl .UFR was calculated as the total daily excreta creatinine output divided by the [Cr] u .Increasing dietary CP increased the GFR, but had no affect on UFR (Fig. 1).In contrast Goldstein et al. (2001) found that increased protein intake in sparrows increased UFR, but not GFR.GFR and UFR of ostriches in this study averaged 47.2 ± 5.5 and 2.46 ± 0.26 mL/min, respectively.This GFR value is lower than that predicted allometrically for a 100 kg bird, but similar to that predicted for avian species from arid habitats (Bennett and Hughes 2003).

10.1071/eav48n10posters

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