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Common Duck-Brown Tsaiya

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Location of Conservation: Ilan Research Station

Taiwan Livestock Research Institute

28-1 Jehsin village

Wuchieh, Ilan, Taiwan

Republic of China

Tel: 886-39-503107∼9

Fax: 886-39-501950

Contributor: Mr. Jang-Fang Huang

　

Visible Characteristics

1. Brown Tsaiya have brown or light brown feathers.
2. Dark green or dark brown over the head and neck.
3. Females' beaks turn from orange to chestnut after egg laying.
4. Lay up to 320 eggs a year but don't brood on them.
5. Sex feather appearsafter 6 weeks old in drake and its color is greenish or brown at mature.
6. Congregate, jittery, easily frightened.

Growth
Performance	Mean±SD
Body weight at
10 weeks old(M)	1.10±0.14 Kg
16 weeks old(M)	1.25±0.13 Kg
20 weeks old(M)	1.33±0.11 Kg
40 weeks old(M)	1.36±0.13 Kg
Body weight at
10 weeks old(F)	1.07±0.12 Kg
16 weeks old(F)	1.24±0.12 Kg
20 weeks old(F)	1.39±0.11 Kg
40 weeks old(F)	1.48±0.12 Kg
8th feather length
10 weeks old(M)	9.9±2.8 cm
16 weeks old(M)	15.8±0.6 cm
20 weeks old(M)	15.8±0.5 cm
8th feather length
10 weeks old(F)	10.6±2.7 cm
16 weeks old(F)	15.3±0.4 cm
20 weeks old(F)	15.1±0.4 cm

　

Reproductive		Laying
Performance	Mean±SD	Production
Age at first egg	15 weeks
Number of eggs		Hen-day egg
produced at		production from
40 weeks old	- eggs	15 to 104 weeks of
360 days old	- eggs	age: Peak at 34
Egg weight		weeks of age with
produced at		65.5％
30 weeks old	63.7±4.5 g		Laying period with
40 weeks old	70.1±4.1 g		over 60％ hen-day
78 weeks old	66.5±5.9 g		egg production: 29
Shell strength of			to 80 weeks of age
egg produced at
30 weeks old	3.7±0.7 Kg/cm2
40 weeks old	3.4±0.8 Kg/cm2
Yolk weight of
egg produced at
30 weeks old	21.1±2.0 g
40 weeks old	24.8±2.2 g

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