Growth and reproductive performance of Australian Black swans under articicial feeding in Taiwan
Chih-Chang Hsiao, Yu-Shine Jea, and Yieng-How Chen
The objectives of this study were to collect the basic data of growth and reproductive performance of Australian Black Swans raised in captivity. Trial 1, Thirty-six cygnets of Australian Black Swans raised in Chang-Hua Propagation Station of LRI from 1992 to 1997 were used to analyse growth performance. Trial 2, reproductive trait were collected and analysed from Sixteen Australian Black Swans in Chang-Hua Propagation Station of LRI from September 2007 to February 2011. The results indicated that there was no significantly difference in the body weight of cygnets between male and female before 12 weeks of age. Nevertheless, male cygnet had higher body weight than that of female at 14 weeks of age (P < 0.05). Australian Black Swans reached sexual maturity at 570- 720 days of age and the breeding season of birds occurred between September to February of next year. Birds had 1-4 clutches in each breeding season and each clutch interval lasted for more 30 days. Female swan laid 1-7 eggs at each clutch and the average egg number was 4.17. Birds laid egg every other day and the weight of egg was around 260 g. The incubation period of swan eggs ranged from 35 to 38 days. The fertility and hatchability were 42.23 % and 26.11 %, respectively.
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