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Journal of Animal Science Abstract - Housing and Management

Linear growth model analysis of factors affecting boar semen characteristics in Southern China1


This article in JAS

  1. Vol. 95 No. 12, p. 5339-5346
    Received: June 27, 2017
    Accepted: Oct 02, 2017
    Published: November 30, 2017

    2 Corresponding author(s):

  1. C. Wang*,
  2. J. L. Li†‡,
  3. H. K. Wei*,
  4. Y. F. Zhou*,
  5. J. J. Tan,
  6. H. Q. Sun,
  7. S. W. Jiang 2†§ and
  8. J. Peng 2
  1. * Department of Animal Nutrition and Feed Science, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, P. R. China
     Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education & Key Lab of Swine Genetics and Breeding of Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, P. R. China
     YangXiang Joint Stock Company, Guigang 537000, P. R. China
    § The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, P. R. China


This study investigated the factors affecting the semen traits of boars in Southern China. A total of 172,408 ejaculates of boars from 9 AI centers were collected from January 2013 to May 2016. A linear growth model was used to analyze the effects of leve1 1 (boar breed, age, season, and boar age at herd entry) and level 2 (housing type) factors on semen quality. The intraclass correlation coefficients of semen volume, total sperm number, functional sperm number, sperm concentration, motility, and abnormal sperm were 0.62, 0.62, 0.61, 0.60, 0.54, and 0.70, respectively. Boars reared in ordinary houses had lower total and functional sperm numbers than those reared in air filtration houses (P < 0.05). The functional sperm number of Duroc boars was lower than that of Landrace and Yorkshire boars (P < 0.05). The total and functional sperm numbers were lowest from May to September and peaked at the age of 34.1 and 37.7 mo, respectively. Furthermore, boars aged 8 and 9 mo at herd entry had greater functional sperm numbers than those aged 5, 6, 7, and 12 mo at herd entry (P < 0.05), whereas no significant difference was observed between boars aged 8 mo and boars aged 9 mo at herd entry (P > 0.05). In conclusion, the linear growth model is suitable for longitudinal data analysis. To improve boar breeding, sunstroke prevention in the early spring should be given greater attention. Importantly, 8 mo appears to be the most suitable age for boar introduction, especially for Duroc boars.

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