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GB 2418-2003Livestock and poultry breed (synthetic lines) - Neijiang pig (English PDF)

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Issued by

State Administration for Market Regulation

Level / Type

National · Mandatory

Issue date

February 27, 2026

Implementation date

September 1, 2026

Scope

GB 2418-2003 (Livestock and poultry breed (synthetic lines) - Neijiang pig) is available as an English-translated PDF.

GB 2418-2003 — This document specifies the breed origin and characteristics, body shape, adult weight and body size, production performance, and basic requirements for breeding of Neijiang pigs.

The determination method was described. This document applies to the identification of Neijiang pigs.

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Document preview — GB 2418-2003

National Standard of the People's Republic of China

ICS: 65.020.30
Classification: B 43
Replacing: GB/T 2418-2003

Issued by: State Administration for Market Regulation

Foreword
1 Scope
3 Terms and Definitions
4 Variety origin and characteristics
5 Physical appearance
6 Adult weight and body size
6.1 Lion-head type Neijiang pig
6.2 Neijiang Pig with a Large Mouth
7 Production performance
7.1 Reproductive performance
7.2 Growth and Development
7.3 Fattening performance
7.4 Carcass characteristics
7.5 Muscle Quality
8 Determination Methods
8.1 Measurement of adult body weight, body size, and reproductive performance
8.2 Growth and development performance testing
8.3 Determination of carcass traits
8.4 Muscle quality determination
9 Basic requirements
Foreword

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document replaces GB/T 2418-2003 "Neijiang Pig". Compared with GB/T 2418-2003, the main differences are structural adjustments and editorial changes.

In addition, the main technological changes are as follows.

a) The varietal origin and characteristics have been changed (see Chapter 4, 2003 edition, 2.1);

b) The physical appearance was altered (see Chapter 5, 2003 edition, 2.2);

c) Adult body weight measurements have been changed (see Chapter 6, 3.2 of the 2003 edition);

d) Reproductive performance was modified (see 7.1, 3.3 in the 2003 version);

e) Changes were made to growth and development (see 7.2, 2.3 in the 2003 edition);

f) Fattening performance was modified (see 7.3, 3.4 in the 2003 edition);

g) Increased carcass traits (see 7.4);

h) Increased muscle mass (see 7.5);

i) Additional measurement methods have been added (see Chapter 8);

j) The basic requirements for seed use have been changed (see Chapter 9, Chapter 4 of the 2003 edition);

k) The classification of breeding pigs has been removed (see 3.1 in the 2003 edition).

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the Ministry of Agriculture and Rural Affairs of the People's Republic of China.

This document is under the jurisdiction of the National Technical Committee on Standardization of Animal Husbandry (SAC/TC274).

1 Scope

This document specifies the breed origin and characteristics, body shape, adult weight and body size, production performance, and basic requirements for breeding of Neijiang pigs.

The determination method was described.

This document applies to the identification of Neijiang pigs.

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined.

4 Variety origin and characteristics

Neijiang pigs are a superior local breed in my country, divided into two groups. the Lion Head type and the Haoganzui type (Wuhuang pig). The Lion Head type Neijiang pig originated from...

The area is located in Shizhong District and Dongxing District of Neijiang City, Sichuan Province, and is mainly distributed in Shizhong District, Dongxing District, Weiyuan County, and Zizhong County of Neijiang City; the area is characterized by a "Haoganzui" type of Neijiang.

The pig originated in Yanjiang District, Ziyang City, and is mainly distributed in Yanjiang District, Anyue County, and Lezhi County of Ziyang City. It is characterized by strong adaptability, tolerance to roughage, and early growth rate.

It is characterized by rapid growth and a docile temperament.

Note. The Neijiang pig with a fine snout is also known as the Wuhuang pig.

5 Physical appearance

Neijiang pigs are covered in black hair, have thick skin, are relatively large in size, have drooping, medium-sized ears, and 12 to 16 teats. Adult boars and sows have tails at the base of their tails.

The two groups are relatively coarse. The differences in appearance between them are as follows.

a) Lion-head type Neijiang pig the head is relatively short, the forehead is wide with deep horizontal wrinkles, and the limbs are sturdy. See Appendix A for a photograph of the lion-headed Neijiang pig.

b) Neijiang pig with a large snout the snout is slender and slightly upturned with few wrinkles, and the limbs are extended and upright. See Appendix A for a photograph of the Neijiang pig with the Haogan snout type.

6 Adult weight and body size

6.1 Lion-head type Neijiang pig

The weight and body size of adult boars (23-25 months old) and adult sows (third litter, 2 months of gestation) should meet the requirements of Table 1.

6.2 Neijiang Pig with a Large Mouth

The weight and body size of adult boars (23-25 months old) and adult sows (third litter, 2 months of gestation) should meet the requirements of Table 2.

7 Production performance

7.1 Reproductive performance

7.1.1 Lion-head type Neijiang pig

Boars exhibit sexual behavior at 100-130 days old, are ready for mating at 160-190 days old, and weigh 50-75 kg at the appropriate mating weight; sows reach puberty on [date missing].

The sows should be 100-140 days old, with a suitable mating age of 160-200 days and a suitable mating weight of 50-75 kg. The farrowing and weaning performance of sows should meet the requirements of Table 3.

Require.

7.1.2 Neijiang Pig with a Large Mouth

Boars exhibit sexual behavior at 110-150 days of age, are ready for mating at 140-200 days of age, and weigh 50-80 kg at the optimal mating weight. Sows reach their first estrus.

Sows should be 100-140 days old, with a suitable mating age of 150-210 days and a suitable mating weight of 50-80 kg. Farrowing and weaning performance of sows should meet the requirements of Table 4.

Requirements.

7.2 Growth and Development

7.2.1 Lion-head type Neijiang pig

From weaning to 90 days, the dietary digestible energy was 14.54 MJ/kg and the crude protein content was 18.0%; from 91 to 180 days, the dietary digestible energy was 14.23 MJ/kg.

At a nutrient level of 16.0% crude protein, the main growth and development performance should meet the requirements of Table 5.

7.2.2 Neijiang Pig with a Large Mouth

From weaning to 90 days, the dietary digestible energy was 13.46 MJ/kg and the crude protein content was 19.0%; from 91 to 180 days, the dietary digestible energy was 12.76 MJ/kg.

At a nutrient level of 16.0% crude protein, the main growth and development performance should meet the requirements of Table 6.

7.3 Fattening performance

7.3.1 Lion-head type Neijiang pig

For individuals weighing 20kg to 60kg, the dietary digestible energy is 14.23 MJ/kg and the crude protein content is 16.0%; for individuals weighing 60kg to 90kg, the dietary digestible energy...

Under nutritional conditions of 13.45 MJ/kg and 14.0% crude protein, the average daily weight gain was 451.3 g ± 35.2 g, and the feed conversion ratio was 4.05 ± 0.41.

A 90kg live animal has a back fat thickness of 32.4mm ± 5.5mm.

7.3.2 Neijiang Pig with a Large Mouth

For individuals weighing 20kg to 60kg, the dietary digestible energy is 13.81 MJ/kg and crude protein is 16.0%; for individuals weighing 60kg to 90kg, the dietary digestible energy...

Under nutritional conditions of 12.76 MJ/kg and 14.0% crude protein, the average daily weight gain was 454.4 g ± 38.3 g, and the feed conversion ratio was 3.99 ± 0.29.

A 90kg live animal has a back fat thickness of 31.0mm ± 4.6mm.

7.4 Carcass characteristics

7.4.1 Lion-head type Neijiang pig

Slaughter weight was 99.79 kg ± 5.15 kg, dressing percentage was (66.53 ± 4.32)%, carcass weight was 66.39 kg ± 5.35 kg, and carcass length was [missing information].

84.5cm ± 6.7cm, average backfat thickness 41.2mm ± 8.7mm, eye muscle area 21.58cm² ± 1.95cm², carcass lean meat percentage (36.07 ± 6.7cm).

2.33%).

7.4.2 Neijiang Pig with a Large Mouth

Slaughter weight was 82.84 kg ± 6.80 kg, dressing percentage was (66.86 ± 3.22)%, carcass weight was 55.44 kg ± 5.78 kg, and carcass length was [missing information].

69.6cm ± 8.9cm, average backfat thickness 32.2mm ± 4.4mm, eye muscle area 23.84cm² ± 3.63cm², carcass lean meat percentage (37.49 ± 8.9cm).

2.69%).

7.5 Muscle Quality

7.5.1 Lion-head type Neijiang pig

Slaughtered at a body weight of 99.79 kg ± 5.15 kg, meat color score 3.8 ± 0.7, marbling score 3.7 ± 1.2, pH 16.33 ± 0.29, pH 24 5.78±0.15, drip loss (2.07±0.73)%, intramuscular fat content (5.18±0.49)%.

7.5.2 Neijiang Pig with a Large Mouth

Slaughter weight 82.84kg±6.80kg, meat color score 3.6±0.5, marbling score 3.6±0.8, pH 16.14±0.22, pH 24 5.81±0.16, drip loss (2.25±0.58)%, intramuscular fat content (4.36±1.17)%.

8 Determination Methods

8.1 Measurement of adult body weight, body size, and reproductive performance

Perform in accordance with the provisions of NY/T 820.

8.2 Growth and development performance testing

Perform in accordance with the provisions of NY/T 822.

8.3 Determination of carcass traits

Perform in accordance with the provisions of NY/T 825.

8.4 Muscle quality determination

Perform in accordance with the provisions of NY/T 821.

9 Basic requirements

It should meet the following requirements.

a) The body shape and appearance should conform to the characteristics of this variety, and the growth and development should be normal;

b) No hereditary diseases or defects, and in good health;

c) Individual specimens are clearly identified, their origin is clear, and their pedigree records are accurate and complete;

d) The data on the main economic traits of the individuals or parents have been fully measured.

GB/T 2418-2026. Livestock and Poultry Breeds (Strains) - Neijiang Pig ICS 65.020.30 CCSB43 National Standards of the People's Republic of China Replaces GB/T 2418-2003 Livestock and poultry breeds (breeding systems). Neijiang pig Published on 2026-02-27 Implemented on 2026-09-01 State Administration for Market Regulation the State Administration for Standardization issued a statement.