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Effect of breeder age and breeding season on egg production and incubation in farmed ostriches
- Publication Year :
- 2004
- Publisher :
- Taylor & Francis, 2004.
-
Abstract
- (1) This research was carried out to investigate changes in egg production and hatchability as influenced by age and breeding season of 10 trios (two females, one male) of ostrich (Struthio camellus) during 1998 to 2002. (2) Breeding season affected number of eggs laid per female per season, average egg weight, length of laying period and clutch sequence. (3) The number of eggs laid per female per season was 25 in the first breeding season and 57 by the fifth breeding season. The laying period lasted 169 d in the first season whereas it was 210 d by the fifth season. The breeding season became longer year by year. (4) The number of clutches was two in the first season, three in the second and 4 in the later breeding seasons: the mean interval between cycles was 9 to 10.6 d and the mean number of eggs in one cycle varied from 12 to 14.4. (5) The breeding season affected the hatchability of fertile eggs, chick weight at hatching, hatchability of total eggs, fertility, malpositioned embryos, deformed chicks and assisted chicks during hatching. The first 4 variables increased and the last three decreased, with each breeding season. (6) Weight loss of eggs and length of incubation were unaffected by the breeding season. Hatchability which was 64.3% in the first season increased progressively and reached 73.1% in the fifth breeding season.
- Subjects :
- Male
Aging
United-Kingdom
media_common.quotation_subject
Performance
Oviposition
Chicks
Fertility
Gallus gallus
Hatchability
Biology
Breeding
Agriculture, dairy & animal science
Time
Ostrich
Struthio camelus
Struthio-camelus eggs
Eastern Australia
Animal science
Struthio
Seasonal breeder
Animals
Incubation
media_common
Struthioniformes
Ecology
Hatching
Animal
Prenatal development
Reproduction
Time factors
Methodology
Agriculture
Ostriches
Rheiformes
Struthio Camelus
Egg laying
General Medicine
Weight
embryonic structures
Animal Science and Zoology
Female
Seasons
Season
Food Science
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....4126a26b2f4b0eaaec7ebc7848e391b3