Document Type : Original Articles
Authors
1
Department of Physiology, Faculty of Veterinary Medicine, Mansoura University.
2
Department of Physiology, Faculty of Veterinary Medicine, Mansoura University
3
Anim. Prod. Res. Institute, Agric. Res. Center, Ministry of Agric; Dokki, Giza, Egypt.
Abstract
This study was conducted to investigate how ducks age (Dumyati strain) could affect on some productive traits, egg quality and performance of their offspring. Egg number, egg weight egg mass, Egg production % ,feed consumption and feed conversion to egg was investigated during three periods at (24-32)wk ,(32-40) wk and (40-48) wk. While 30 eggs were collected for determination egg quality at 4 different ages (24 ,32 ,40,48) wk old including (egg weight, egg shape index % (ESI) , shell % and thickness , albumin % ,Haugh unit (HU ) ,yolk % , yolk index and yolk color and shell % and thickness, while a total of 2016 eggs were set in the incubator (504 egg /age ) at the same intervals to determine egg hatchability traits. After complete hatching, (30) duckling-one day old- from each age weighed (initial body weight) and raised for 10 wk old through this period body weight (BW) ,body weight gain (BWG) ,feed consumption (F.C) and feed conversion ratio (FCR) were recorded bi-weekly. The Results of this investigation revealed that, egg production % and egg number significantly decreased with age, while egg weight significantly increased .but egg mass and FCR during 3 different periods didn’t show any significant difference. Some egg traits (egg weight, ESI%, yolk % and shell thickness) were significantly increased with advancing ducks age. However, albumin proportion significantly decreased as the productive season progress, but shell % didn’t show any significant difference between different ages. HU and yolk index show deterioration with age. Fertility % of eggs significantly increased with age advancing, While early mortality % was significantly higher at the begging of laying season (24 wk old), also total embryonic mortality% showed significant increase in eggs from young ducks breeder, however hatchability of total egg % didn’t show any significant difference. Ducklings weight at hatch showed a significant increase with age, but this did not reflect on final body weight or BWG, which significantly decreased with age. Older breeder (48) wk old showed the lowest F.C and 40 wk old breeders had the lowest FCR. No-doubt that age of ducks in this study had a clear effect on some productive traits, egg traits and somewhat performance of offspring. Although of that we can’t ignore environmental temperature changes with aging of ducks flock.
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