One of the problems of breeding of endangered species in captivity is inbreeding. An exemplary illustration is the inbreeding in the white tigers of Rewa. Genealogies and other relevant information on white tigers were collected from four Zoological Parks to investigate whether matings between close relatives were responsible for the reduction in litter size and increase in early mortality which has been observed. Inbreeding coefficients were calculated for different types of mating. It was generally found that tigers failed to survive, if their inbreeding coefficient attained a level of 0·4687 or higher. Regression analysis reveals a tendency for the average litter size to decrease and the early mortality rate to increase with an increase in the value of the inbreeding coefficient.
KeywordsGenealogy inbreeding coefficient linear regression litter size mortality rate white tigers
Unable to display preview. Download preview PDF.
- Johansson I and Rendel J 1968Genetics and Animal Breeding (London: Oliver and Boyd)Google Scholar
- Kudo A 1962 A method for calculating the inbreeding coefficient;Am. J. Hum. 14 426–432Google Scholar
- Wright S 1922 The effects of inbreeding and crossbreeding on guinea pigs. I. Decline in vigor. II. Differentiation among inbred families;U.S.D.A. Bull. 1090 p. 65Google Scholar
- Wright S 1951 The genetical structure of populations;Ann. Eugen. 15 323–354Google Scholar