27/02/2024 14:51

What are the standards for multi-spurred chickens used for breeding purposes in Vietnam?

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What are the standards for multi-spurred chickens used for breeding purposes in Vietnam? Mr. Van Chien (Kien Giang).

Hello, Lawnet would like to answer as follows:

1. What are the standards for multi-spurred chickens used for breeding purposes in Vietnam?

According to TCVN 12469-8:2020, multi-spurred chickens raised for breeding purposes need to meet the following standards:

Requirements for physical characteristics

Requirements for the appearance of Multi-Spur chickens include characteristics of shape, feather color, skin color, beak color, leg skin color, crest color, wattle color, number of spurs, crest type at 1 day old, 8 weeks old and 38 weeks of age is specified according to the table below:

Criteria	01 day old	8 weeks old		Adult living in urban areas (38 weeks old )
Criteria	01 day old	Rooster	Hen	Rooster	Hen
Shape	Compact	The front body is small, gradually getting bigger towards the back	The front body is small, gradually getting bigger towards the back	The front body is small, gradually getting bigger towards the back	The front body is small, gradually getting bigger towards the back
Fur color	Black, light yellow, brown stripes, black stripes	Plum color, black color, apricot color, brown color	Black, dark brown	Plum color, black color, apricot color, brown color	Black, dark brown
Skin color	Yellow	Yellow	Yellow	Yellow	Yellow
Beak color	Black, yellow	Yellow; dusky	Yellow; dusky	Yellow; dusky	Yellow; dusky
Leg color	Black, yellow	Black gold	Black gold	Black gold	Black gold
Crest color		Red gold	Red gold	Red	Red
Cum color		Boat gold	Red gold	Red	Red
Crest type				Bud ^a , strawberry ^b	Bud, strawberry, flag
Number of spurs				≥ 2	≥ 2
^a Inverted lemon wedge shape; ^b Strawberry shape.

Table: Appearance characteristics of multi-spurred chickens

Growth requirements

The growth ability of multi-spurred chickens is evaluated by the measurements at 8 weeks of age and 38 weeks of age. Specifically, the measurements are specified in the following table:

Criteria	8 weeks old		38 weeks old
Criteria	Rooster	Hen	Rooster	Hen
1. Body length, measured in centimeters	15 ÷ 20	13 ÷ 18	23 ÷ 28	19 ÷ 24
2. Chest circumference, in centimeters	17 ÷ 22	17 ÷ 22	35 ÷ 40	27 ÷ 32
3. Chest circumference/body length	1.2 ÷ 1.5	1.2 ÷ 1.5	1.2 ÷ 1.5	1.2 ÷ 1.5
4. Length of the keel, in centimeters	7 ÷ 12	7 ÷ 12	14 ÷ 19	13 ÷ 18
5. Wing feather length, measured in centimeters	≥ 12	≥ 11	≥ 16	≥ 15
6. Foot height, in centimeters	4 ÷ 6	3 ÷ 5	8 ÷ 10	7 ÷ 9

Table: Measurement of multi-spurred chicken

Requirements for reproductive performance

The reproductive performance of multi-spurred chickens is evaluated by criteria on egg laying and indicators on egg quality and hatching rate.

- Indicators of the reproductive performance of multi-spur chickens need to meet the following requirements:

+ Childbirth age in weeks: 22 ÷ 24

+ Average birth rate, calculated in %: ≥ 32%

+ Egg yield/number of hens at the beginning of the period/48 weeks of laying, calculated in eggs: ≥ 105 eggs

+ Egg yield/average number of hens/48 weeks of laying, calculated in eggs: ≥ 109 eggs

+ Food consumption for 10 eggs, calculated in kg: ≤ 4.9 kg

+ Death rate, type/month, in %: ≤ 2%

- Egg quality and hatchability criteria need to meet the following requirements:

+ Egg weight, in grams: 40 ÷ 50 g

+ Large diameter (D), in mm: 45 ÷ 55 mm

+ Small diameter (d), in mm: 35 ÷ 45 mm

+ Morphological index (D/d): 1.30 ÷ 1.42

+ Percentage of eggs with embryos, calculated in %: ≥ 90%

+ Hatching rate/eggs with embryos, calculated in %: ≥ 95%

+ Hatching rate/total number of eggs incubated, calculated in %: ≥ 80%

+ Percentage of type 1 chickens/total number of chickens hatched alive, calculated in %: ≥ 95%

2. Sampling method for multi-spurred chickens in Vietnam

TCVN 12469-8:2020 regulates the sampling method of multi-spurred chicken specifically as follows:

Chicken sample

Randomly take 10% of the multi-spurred chickens in the total flock (minimum 30 chickens), at 1 day old, 8 weeks old, and 38 weeks old (adult chickens).

Egg sampling

Randomly take at least 30 multi-spurred chicken eggs at the time the chickens are laid at 37 to 38 weeks of age.

Best regards!

- This English translation is for reference purposes only and not a definitive translation of the original Vietnamese texts;
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