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GB/T 24865-2010: Maiwa yak
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Maiwa yak
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GB/T 24865-2010
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Basic data | Standard ID | GB/T 24865-2010 (GB/T24865-2010) | | Description (Translated English) | Maiwa yak | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B43 | | Classification of International Standard | 65.020.30 | | Word Count Estimation | 10,153 | | Date of Issue | 2010-06-30 | | Date of Implementation | 2011-01-01 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.2 (Total No.157) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the characteristics and features of grading Maiwa yak breeds. This standard applies to Maiwa yak breeding cattle identification and grading varieties. | GB/T 24865-2010: Maiwa yak---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Maiwa yak
ICS 65.020.30
B43
National Standards of People's Republic of China
Yak
Issued on. 2010-06-30
2011-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard Annex A, Annex B is normative appendix, Appendix C is informative appendix.
The standard proposed by the People's Republic of China Ministry of Agriculture.
This standard by the National Standardization Technical Committee of animal husbandry.
This standard was drafted. Sichuan livestock breeding improved Terminus, Southwest University for Nationalities, Hongyuan County Bureau of Animal Husbandry, breeding livestock change Aba
Good station.
The main drafters of this standard. Wang Jianwen, Fu Changxiu, Wen Li Yong, Wang Tianfu, Zhang Dawei.
Yak
1 Scope
This standard specifies the breed characteristics yak and grading.
This standard applies to yak breed cattle identification and grading.
2 Variety Characteristics
2.1 Features
Yak yak belongs to China's excellent local varieties of alpine meadow and marsh grass has good adaptability with milk and
High butterfat content of fine features.
2.2 conformation
Most horned yak, broad forehead flat, tufted curly forelock, elderly blindfold. Coat with black hair main body, rarely variegated. Chest hair
Up, chest deep, ribs opened. The body is long, waist straight, big belly does not sag, narrow slightly sloping rump. Short limbs, hoof quality solid. Chest, side
The growth of hair and tail, tail hair was fastigiate. Bulls head heavy, thick angle, up to both sides Stretch sharp angle slightly backward curved inwards; male appearance
Defended, stubby neck, Society A high and plump. Cow head handsome, angular fine, moderate length neck, Society A low.
2.3 Performance
2.3.1 Growth
Calf birth weight 11.5kg ~ 15.5kg, female calf birth weight 11.1kg ~ 14.7kg. 6-month-old male calf weighing 50kg ~ 75kg, flat
Average daily gain 267g; female calves weighing 48kg ~ 70kg, average daily gain of 259g. 1 year to 4-year-old bull average annual weight gain of 44.7kg, mother
The average weight gain of 33.3kg cow per year.
2.3.2 Milk Performance
Under grazing conditions, once daily in the morning milking, June to October 150d milking as follows. First production 125kg ~ 190kg, 160kg ~ parous
260kg. Peak lactation pasture each year in July. 18% dry milk, milk protein 5%, 6.0% milk fat ~
7.5%.
2.3.3 meat performance
Under grazing conditions, 3.5 years to 4.5 years steers weighing 200kg ~ 240kg, slaughter rate of 49% ~ 52%, net meat rate of 38% to 39%.
9-11 rib muscle samples containing dry matter 26.4% ~ 27.4%, 19.9% \u200b\u200b~ 21.3% of protein, fat 5.4% to 5.5%, ash
1.0%.
2.3.4 reproductive performance
Cow estrus season for the annual June to September, July and August as the heat season. Estrous cycle 18.2d ± 4.4d, duration of estrus
12h ~ 16h, pregnancy 275d ± 5d. 3-year-old began breeding yaks, usually two years, a child, reproductive survival rate of 38% to 50%. bull
2.5 breeding age, the age of 6 to 9 years of vigorous breeding period.
3 classification
3.1 conformation
See Appendix C yak pictures, according to the provisions in Table 1 Top score, then Table 2 rating.
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