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A NYALA HERD, Tragelaphus angasi , AT NEW YORK ZOO SINCE 1939 WITHOUT NEW BLOOD

A NYALA HERD, Tragelaphus angasi , AT NEW YORK ZOO SINCE 1939 WITHOUT NEW BLOOD by Grace H. Davall Assistant Curator, Mammals and B r s New York Zoological Society, New York id, Zoological Park, USA T H E question is sonietinies raised as to the effects ofcontinuous in-breeding over a long period in certain species. The experience of the New York Zoological Park with the nyala, Tragelaphus a q a s i , is of some interest in this connection. Our first pair of nyalas was received in July 1939. The female was killed by the male in the following winter and the male died w i t h a year. There was, of course, no breeding. In September 1939, a second pair arrived, directly fiom South Africa and from it a herd has been built up and continuously maintained, without the addition of new blood. Up to the end of May 1964, births totalled eighty-three, of which forty-two were males and thirty-seven females; records fail to indicate the sex of the remaining four. Over the years there has been some variation in the viability of the young, apparently due to local conditions. W e are satisfied that in-breeding was not the cause. Fairly recently, our Veterinarian, Dr Charles P. Gandal, has http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Zoo Yearbook Wiley

A NYALA HERD, Tragelaphus angasi , AT NEW YORK ZOO SINCE 1939 WITHOUT NEW BLOOD

Davall, Grace H.
International Zoo Yearbook , Volume 5 (1) – Jan 1, 1965
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Publisher
Wiley
Copyright
Copyright © 1965 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0074-9664
eISSN
1748-1090
DOI
10.1111/j.1748-1090.1965.tb01570.x
Publisher site
See Article on Publisher Site

Abstract

by Grace H. Davall Assistant Curator, Mammals and B r s New York Zoological Society, New York id, Zoological Park, USA T H E question is sonietinies raised as to the effects ofcontinuous in-breeding over a long period in certain species. The experience of the New York Zoological Park with the nyala, Tragelaphus a q a s i , is of some interest in this connection. Our first pair of nyalas was received in July 1939. The female was killed by the male in the following winter and the male died w i t h a year. There was, of course, no breeding. In September 1939, a second pair arrived, directly fiom South Africa and from it a herd has been built up and continuously maintained, without the addition of new blood. Up to the end of May 1964, births totalled eighty-three, of which forty-two were males and thirty-seven females; records fail to indicate the sex of the remaining four. Over the years there has been some variation in the viability of the young, apparently due to local conditions. W e are satisfied that in-breeding was not the cause. Fairly recently, our Veterinarian, Dr Charles P. Gandal, has

Journal

International Zoo Yearbook – Wiley

Published: Jan 1, 1965

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