ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (12): 2414-2419.doi: 10.11843/j.issn.0366-6964.2016.12.011

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Comparative Analysis of Two Versions of Code of Practice of Type Classification in Chinese Holstein

LI Xiang1, YAN Xin-yi1, CAO Lu1, TIAN Jia2, QIN Chun-hua3, LI Wei-qi2, WEN Wan2, SHI Wan-hai4, ZHANG Sheng-li1, ZHANG Yuan1, WANG Ya-chun1*   

  1. (1.China Agricultural University, Beijing 100193, China; 2. The Ningxia Hui Autonomous Region Animal Husbandry Station, Yinchuan 750004, China; 3. Ningxia Sygen Bio-engineering Research Center, Yinchuan 750200，China;4. Beijing Dairy Cattle Center, Beijing 100085, China)
  • Received:2016-07-25 Online:2016-12-23 Published:2016-12-23

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Abstract:

To compare and analyze the differences and similarities between two versions of Code of Practice of Type Classification in Chinese Holstein (use Code of Practice for short) , a total of 2 174 first lactation Holstein cows from 26 farms in Ningxia area were evaluated by 9-points type classification system. The weights from the two versions of Code of Practice were used to evaluate the score of 5 composites (Body size, rump, feet and legs, udder, dairy form) and type final score. The results showed that the weight of Udder was increased while the weight of Dairy Form was decreased. Compared with the final score derived from the old version, the range of final score from the new version was wider, which can explore the difference more efficiently among individuals within the population and difference among daughters from different bulls, respectively. The results conclude that the new version of Code of Practice can better fit to Chinese Holstein, and more beneficial to promote the genetic gain.

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