ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (11): 2226-2234.doi: 10.11843/j.issn.0366-6964.2019.11.006

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Population Characteristics and Factors Influencing Somatic Cell Count in Early Lactation Stage in Holstein

ZHU Lei1,2, ZHANG Hailiang2, CHEN Shaokan1,2, AN Tao1,2, WANG Yan3, WANG Yachun2*, HUANG Xixia1*   

  1. 1. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    3. Beijing Sunlon Livestock Development Co., Ltd, Beijing 100029, China
  • Received:2019-03-26 Online:2019-11-23 Published:2019-11-23

Abstract: The objective of this study was to explore the general characteristics of somatic cell count(SCC) and analyze the factors affecting SCC of Holstein in early lactation stage in Beijing area. From June to July 2018, daily SCC of 124 cows in a dairy farm was measured in first 7 days after calving. The factors influencing SCC in early lactation stage were analyzed by GLM procedure of SAS software, and the relationship between somatic cell score (SCS) during first 7 days after calving and test-day SCS in following months was analyzed by REG procedure. The results showed that the SCC in early lactation stage was higher than test day SCC (8-133 days after calving), and the average SCC from 0 to 7 days after calving was (860±1 287) 103·mL-1. Parity, days in milk, environmental temperature and humidity had significant impacts on SCS in early lactation stage (P<0.05). There was a significant regression relationship between SCS in early lactation stage and test day SCS in 39-68 days after calving(P<0.01), and the regression coefficient was 0.40. The average SCC of Holstein in early lactation stage(0-7 d) was higher than the average SCC in other stages. And the SCC of Holstein in the early lactation stage was sensitive to changes of different physiological states and environmental factors of cattle. This study laid the foundation for the genetic analysis of SCC in early lactation stage, and provided a reference for the management of mastitis in dairy farm according to SCC in the early lactation stage.

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