China Animal Husbandry and Veterinary Medicine ›› 2024, Vol. 51 ›› Issue (11): 4851-4859.doi: 10.16431/j.cnki.1671-7236.2024.11.020

• Genetics and Breeding • Previous Articles    

Analysis of the Population Characteristics and Influencing Factors of Superovulation Response Traits in Northern Chinese Holstein Cattle

HUANG Yuechuan1,2, ZHANG Hailiang2, LIU Zhanpeng3, ZHAO Shanjiang4, SUN Wei5, LI Xihe5, WANG Lin6, ZHU Huabin4, HUANG Xixia1, WANG Yachun2   

  1. 1. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. State Key Laboratory of Farm Animal Biotech Breeding, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproductive of Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    3. National Center of Technology Innovation for Dairy, Hohhot 010020, China;
    4. Key Laboratory of Animal(Poultry) Genetics Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Science of CAAS, Beijing 100193, China;
    5. Inner Mongolia Saikexing Institute of Breeding and Reproductive Biotechnology in Domestic Animal, Hohhot 011517, China;
    6. Beijing Youyuan Animal Husbandry Co., Ltd., Beijing 101308, China
  • Received:2024-02-05 Published:2024-10-31

Abstract: 【Objective】 In vivo superovulation is one of the key technologies in modern dairy cattle breeding,which is of great significance for genetic improvement of dairy cattle populations.This study was conducted to reveal the phenotypic characteristics and main influencing factors in Chinese Holstein cattle,so as to provide foundation for the genetic analysis of superovulation response traits in dairy cattle. 【Method】 In this study,1 855 in vivo superovulation records of 1 842 Chinese Holstein cattle from 9 pastures in Ningxia and Inner Mongolia from March 2021 to August 2023 were collected,7 superovulation response traits were statistically analyzed,including total number of oocytes,number and percentage of transferable embryos,number and percentage of unfertilized oocytes,and number and percentage of degenerated embryos.The Mixed model of SAS 9.2 software was used to analyze the influencing factors on each trait,and the Pearson correlation coefficient among 7 superovulation response traits were calculated using a bivariate correlation program of SPSS 21.0 software. 【Result】 The average number of total oocytes and transferable embryos in Chinese Holstein cattle were 9.49 and 6.01,while the average percentage of transferable embryos was 61.95%.The average number and percentage of unfertilized oocytes were 1.50 and 17.16%,while the average number and percentage of degenerated embryos were 2.29 and 23.34%,respectively.There was varying degrees of phenotypic correlation among 7 superovulation response traits,with correlation coefficients ranging from ―0.629 to 0.882.Seasons had significant influence on all traits except for the percentage of transferable embryos (P<0.05). Hormone types and doses had significant impact on 7 superovulation response traits (P<0.05).Semen dosage significantly affected the number of transferable embryos,degenerated embryos,and the number and percentage of unfertilized oocytes (P<0.05).Donor age had a significant impact only on the percentage of transferable embryos and degenerated embryos (P<0.05). 【Conclusion】 The phenotype of superovulation response traits in Chinese Holstein cattle was similar to the average level in global cattle.The traits were influenced by various non-genetic factors.The results laid a model foundation for further genetic analysis of superovulation response traits in dairy cattle.

Key words: Chinese Holstein cattle; superovulation; population characteristics; Pearson correlation

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