GB 22285-2008Duroc breeding pig (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 22285-2008 Duroc Breeding Pig. Compared with GB/T 22285-2008, except for structural adjustment and editing, in addition to the changes in performance, the main technical changes are as follows.

a) Deleted the content of "Terms and Definitions" (see Chapter 3 of the 2008 edition);

b) Added the content of "Origin and Characteristics" (see Chapter 4);

c) Added the content of "adult weight and body size" (see Chapter 6);

d) The content of "reproductive performance" has been changed (see 7.1, 6.1 of the 2008 edition);

e) The content of "Growth and Development" has been changed (see 7.2, 6.2 of the 2008 edition);

f) The contents of "carcass traits" and "muscle quality" have been modified (see 7.3, 7.4, 6.3 of the 2008 edition);

g) The content of "Determination Method" has been changed (see Chapter 8, Chapter 5 of the 2008 edition);

h) Combined "breeding value" and "breeding pig production requirements" into "breeding basic requirements" and changed the corresponding content (see Chapter 9, 2008 7 and 8 of the 2011 edition).

1 Scope

This document specifies the origin and characteristics, body shape and appearance, adult weight and size, production performance, and basic requirements for breeding of Duroc pig breeders.

The assay method is described.

This document applies to the evaluation of Duroc breeder pigs.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

NY/T 820 Technical Specifications for Breeding Pig Registration NY/T 821 Technical Specification for Determination of Pork Quality NY/T 822 Procedure for determination of production performance of breeding pigs NY/T 825 Technical specification for determination of carcass traits of lean pigs

3 Terms and definitions

There are no terms or definitions that require definition in this document.

4 Origin and characteristics

Duroc pigs are native to New York and New Jersey in the United States and are now widely distributed around the world. They have fast growth rate, high lean meat rate and Strong adaptability and other characteristics.

5 Body shape and appearance

The Duroc pig has a reddish brown coat, with a few being brown, brown-gray, gray-black, etc. A few dark spots are allowed.

Small, short and straight mouth, medium-sized ears, semi-erect and forward-leaning. Back waist and abdomen are straight, body is wide, hindquarters are well-developed, muscles are plump, limbs are thick and strong.

Photos of Rock pig breeders are shown in Appendix A.

6 Adult weight and size

Adult boars (23-25 months old) weigh no less than 270.0 kg, are no less than 150.0 cm long, no less than 85.0 cm tall, and have a chest of 1.

The circumference of an adult sow (third litter, two months of gestation) shall not be less than 147.0cm; the weight of an adult sow (third litter, two months of gestation) shall not be less than 265.0kg, the length of the sow shall not be less than 140.0cm, and the height of the sow shall not be less than 147.0cm.

Less than 85.0cm, chest circumference not less than 153.0cm.