Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (1): 42-51.doi: 10.11843/j.issn.0366-6964.2021.005

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Genetic Parameters Analysis for Milk Production and Type Traits in Chinese Holstein in Hebei

PENG Peng1, LI Jianming2, JIANG Guie2, YANG Chendong2, MA Yabin2, NI Junqing2*, SUN Dongxiao1*   

  1. 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    2. Hebei Livestock Breeding Station, Shijiazhuang 050061, China
  • Received:2020-06-11 Online:2021-01-23 Published:2021-01-19

Abstract: This study aimed to estimate the genetic parameters of milk production and type traits for Chinese Holstein in Hebei province and to provide reference for breeding programs. Based on 8 891 primiparous Chinese Holstein in 133 farms in Hebei province from 2012 to 2018, the genetic parameters for 3 milk production traits (milk yield, milk fat percentage, milk protein percentage) and 26 type traits were analyzed by using AIREML and EM algorithm of the DMU software combined with animal model considering herd-year-season, first calving age, identification year-season and appraisers as fixed effects, and individual additive genetic effect as random effect. The results showed that the heritability estimates ranged from 0.15 (milk yield) to 0.32 (milk fat percentage) for milk traits and from 0.01 (final score) to 0.28 (rear attachment width) for type traits. The estimated genetic correlation coefficients between milk production and type traits ranged from -0.43 (milk yield and bone quality) to 0.31 (milk yield and rump), -0.59 (milk fat percentage and rump) to 0.20 (milk fat percentage and fore teat placement) and -0.34 (milk protein percentage and fore teat length) to 0.23 (milk protein percentage and rear teat placement). The genetic correlations of most type traits with milk yield were positive, but negative with milk fat percentage and milk protein percentage. Strengthening the selection of milk production traits and type traits with medium and high heritability, especially for final score and rear udder traits,is beneficial to the improvement of production performance.

Key words: Hebei province, Chinese Holstein, milk production traits, type traits, genetic parameters

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