Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (5): 1384-1395.doi: 10.11843/j.issn.0366-6964.2022.05.007

• ANIMALGENETICS AND BREEDING • Previous Articles     Next Articles

Analysis of Genetic Parameters of Type Traits and Influence of Genealogical Generation of Holstein Cows in Shandong Province

SONG Yuetong1,2,4, ZHANG Rumei1, LI Yanqin1, LI Rongling1, GAO Yundong1, ZHONG Jifeng1, XUE Guanghui3, WANG Yudong3, LI Jianbin1*, SUN Dongxiao2*   

  1. 1. Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Ji'nan 250102, China;
    2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    3. Shandong OX Livestock Breeding Co. Ltd., Ji'nan 250131, China;
    4. Yantai Research Institute, China Agricultural University, Yantai 264003, China
  • Received:2021-09-06 Online:2022-05-23 Published:2022-05-25

Abstract: This study aimed to evaluate the genetic parameters of type traits of Holstein cows in Shandong province and provide reference for developing breeding programs. Based on 31 963 primiparous Chinese Holstein cows which had 20 type traits data in 144 farms in Shandong province from 2010 to 2020, in which the linear score changed to functional score,the genetic parameters for 20 type traits were analyzed by AI-REML and EM algorithm of the DMU software combined with animal model considering herd, lactation month, first calving age, identification appraisers as fixed effects,and individual additive genetic effect as random effect. The results showed that the heritability of type traits belonged to a medium-low level with the estimated values ranging from 0.049 (set of rear legs) to 0.282 (angularity); The genetic correlation between traits ranged from -0.558 (fore teat placement and udder depth) to 0.717 (heel depth and foot angle). The genetic correlation between body volume traits ranged from 0.118 (body depth and stature) to 0.461 (chest width and loin strength); The genetic correlation between pin setting and pin width was -0.251. The genetic correlation between limb and hoof traits ranged from -0.035 (heel depth and rear leg-rear view) to 0.717 (heel depth and foot angle); The genetic correlation between lactation system traits ranged from -0.558 (fore teat placement and udder depth) to 0.587 (median suspensory and fore attachment). In addition, the standard error of heritability estimation of type traits was the smallest when the number of generations of pedigree was 3, which might be due to the limitation of pedigree data integrity, and further verification was needed.It was beneficial to improve the production performance of dairy cows by strengthening the selection of the traits with high heritability and strong genetic correlation with lactation system. In addition, in the data of this study, the standard error of heritability estimated by the first three generations pedigree was the smallest, so it may be better to estimate genetic parameters by the first three generations pedigree.

Key words: Shandong province, Chinese Holstein cow, type traits, genetic parameters, genealogical generation

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