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Breeding boa hybrids Constrictor c. constrictor × C. c. imperator at Dresden Zoo

Breeding boa hybrids Constrictor c. constrictor × C. c. imperator at Dresden Zoo time of sriting these notes (April 1968) their aierage length is 20 cm. During the winter of 1967 they were dormant for about four months, during \\ hich time growth was negligible. Breeding boa hybrids Constrictor c. coiistrictor .C. c. inipermir i a t Dresden Zoo \J’I N €7 K I E D G E N SC H Ssieiit$c i4ssistatir, Zoologische Garteii, Dresden, Gerr~iaiij~ .At Dresden Zoo we have had a male C~trstrictor c. coiistrictor since 31 March 1963, which was about 2 m long and 6 years old on arrival, and a female C. c. inrprrator since 19 June 1963, w-hich was about 3.2 m long and also 6 years old. Since rtugust 1963 these two snakes have lived together nith another female C. c. constrictor in a vivarium measuring 2 . 0 1 . 9 2.0 m with a pool of ~ ~ I ‘< I x 0.3 m and facilities for climbing. On 2 i December 1963 mating occurred between the male and both females and this was repeated several times in January 1964. S o food \\as taken during the mating period. During the rest of the time a guinea-pig or two small rabbits %ere eaten at intervals of two weeks. On 2 1 February 1964 the female C. c. in~perntor ate some food but then did not feed again before giving birth some 36 months later. In spite of this apparent starvation it increased in girth, and three to four weeks before the birth it showed an abdominal swelling which remained visible until shortly after the birth. Three to four days before thc birth it was observed that the tail, from the cloaca back, \\as tilted sharply upwards. Thc snake usually lay stretched out and 1-erystill. On 4 June 1964 betneen 1230 and 1330 hours 2 2 young snakes, six unfertilised dark-bronn eggs 2nd three young dead in the egg membranes a.ere born. The young snakes were on average j o to jz cm long and 90 g in weight. They had a relatively large yolk sac which became completely resorbed in four days. The smallest snake was only 25 cm long and it died the day after birth. T h e other 21 survived and were reared. Shortly after birth the young snakes were taken out of the vivarium and kept in a separate container at a temperature of 25 to 30”c (77-86°F) and a relative humidity of 707;. This container was provided with damp cloths until the yolk sac had been resorbed in all the snakes. On 8 June 1964 the female C. c. imperator again ate a large guinea-pig. It sloughed on 17 June for the first time since giving birth. Up to this date 13 of the young snakes had sloughed and by 21 June they had all done so. Young mice were offered as the first food and by 21 June I Z of the young snakes had fed on them. From I July all were feeding on adult white mice. In the early stages the young snakes sloughed at intervals of about three weeks, but later every four to six weeks The snakes all showed different colouration but none of them had the conspicuous dark colouration of the female C. c. imperator. The tips of the tails were particularly colourful. By 4 February 196j the young were 1.10 to I . I j m in length and weighed between 850 and 870 g. The female C. c. constrictor did not become pregnant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Zoo Yearbook Wiley

Breeding boa hybrids Constrictor c. constrictor × C. c. imperator at Dresden Zoo

International Zoo Yearbook , Volume 9 (1) – Jan 1, 1969

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Publisher
Wiley
Copyright
Copyright © 1969 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0074-9664
eISSN
1748-1090
DOI
10.1111/j.1748-1090.1969.tb02610.x
Publisher site
See Article on Publisher Site

Abstract

time of sriting these notes (April 1968) their aierage length is 20 cm. During the winter of 1967 they were dormant for about four months, during \\ hich time growth was negligible. Breeding boa hybrids Constrictor c. coiistrictor .C. c. inipermir i a t Dresden Zoo \J’I N €7 K I E D G E N SC H Ssieiit$c i4ssistatir, Zoologische Garteii, Dresden, Gerr~iaiij~ .At Dresden Zoo we have had a male C~trstrictor c. coiistrictor since 31 March 1963, which was about 2 m long and 6 years old on arrival, and a female C. c. inrprrator since 19 June 1963, w-hich was about 3.2 m long and also 6 years old. Since rtugust 1963 these two snakes have lived together nith another female C. c. constrictor in a vivarium measuring 2 . 0 1 . 9 2.0 m with a pool of ~ ~ I ‘< I x 0.3 m and facilities for climbing. On 2 i December 1963 mating occurred between the male and both females and this was repeated several times in January 1964. S o food \\as taken during the mating period. During the rest of the time a guinea-pig or two small rabbits %ere eaten at intervals of two weeks. On 2 1 February 1964 the female C. c. in~perntor ate some food but then did not feed again before giving birth some 36 months later. In spite of this apparent starvation it increased in girth, and three to four weeks before the birth it showed an abdominal swelling which remained visible until shortly after the birth. Three to four days before thc birth it was observed that the tail, from the cloaca back, \\as tilted sharply upwards. Thc snake usually lay stretched out and 1-erystill. On 4 June 1964 betneen 1230 and 1330 hours 2 2 young snakes, six unfertilised dark-bronn eggs 2nd three young dead in the egg membranes a.ere born. The young snakes were on average j o to jz cm long and 90 g in weight. They had a relatively large yolk sac which became completely resorbed in four days. The smallest snake was only 25 cm long and it died the day after birth. T h e other 21 survived and were reared. Shortly after birth the young snakes were taken out of the vivarium and kept in a separate container at a temperature of 25 to 30”c (77-86°F) and a relative humidity of 707;. This container was provided with damp cloths until the yolk sac had been resorbed in all the snakes. On 8 June 1964 the female C. c. imperator again ate a large guinea-pig. It sloughed on 17 June for the first time since giving birth. Up to this date 13 of the young snakes had sloughed and by 21 June they had all done so. Young mice were offered as the first food and by 21 June I Z of the young snakes had fed on them. From I July all were feeding on adult white mice. In the early stages the young snakes sloughed at intervals of about three weeks, but later every four to six weeks The snakes all showed different colouration but none of them had the conspicuous dark colouration of the female C. c. imperator. The tips of the tails were particularly colourful. By 4 February 196j the young were 1.10 to I . I j m in length and weighed between 850 and 870 g. The female C. c. constrictor did not become pregnant.

Journal

International Zoo YearbookWiley

Published: Jan 1, 1969

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