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Evaluation of connectedness between herds for three pig breeds in China

Published online by Cambridge University Press:  01 April 2009

C. Y. Sun ,
C. K. Wang ,
Y. C. Wang ,
Y. Zhang  and
Q. Zhang
C. Y. Sun
Affiliation:
The Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, China Agricultural University, Beijing 100094, China The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China
C. K. Wang
Affiliation:
The Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, China Agricultural University, Beijing 100094, China The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China
Y. C. Wang
Affiliation:
The Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, China Agricultural University, Beijing 100094, China The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China
Y. Zhang
Affiliation:
The Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, China Agricultural University, Beijing 100094, China The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China
Q. Zhang*
Affiliation:
The Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, China Agricultural University, Beijing 100094, China The State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China
*
E-mail: qzhang@cau.edu.cn
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Abstract

Using data on age at 100 kg of three pig breeds (Large White, Landrace and Duroc) the connectedness between herds in China was evaluated by the connectedness rating (CR) method. The results show that most herds in China have low average CR (0–3.59%) with other herds. In Large White, of the 36 herds analyzed there are 20 herds, which are connected with at least one other herd. In Landrace and Duroc, of the 27 and 18 herds analyzed, only four and five herds, respectively, were found having connectedness with other herds. Generally, the connectedness exists only among two or few herds in the same region. A certain degree of connectedness between herds is a precondition for cross-herd genetic evaluation. A national or regional cross-herd genetic evaluation is not practicable at the present time in China. More intense efforts are needed to establish and enhance the connectedness between herds by means of extensively using artificial insemination (AI) in the swine industry in China.

Keywords

connectednesscross-herd genetic evaluationjoint breeding system
Type
Full Paper
Information
animal , Volume 3 , Issue 4 , April 2009 , pp. 482 - 485
Copyright
Copyright © The Animal Consortium 2008

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