Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (11): 5050-5058.doi: 10.11843/j.issn.0366-6964.2024.11.022

• Animal Biotechnology and Reproduction • Previous Articles     Next Articles

Estimation of Genetic Parameters for First Estrus Expression Traits in Holstein Cattle

Tongtong YANG1(), Hailiang ZHANG1, Ao WANG1, Yao CHANG1, Shanshan LI1, Jiahe GUO1, Junxing ZHANG2, Yuechuan HUANG1,2, Liyun HAN2, Yu WANG3, Yachun WANG1,*()   

  1. 1. State Key Laboratory of Animal Biotech Breeding, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding, and Reproduction of Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
    2. Key Laboratory of Ruminant Molecular and Cellular Breeding in Ningxia Hui Autonomous Region, College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
    3. The Ningxia Hui Autonomous Region Animal Husbandry Station, Yinchuan 750021, China
  • Received:2024-04-15 Online:2024-11-23 Published:2024-11-30
  • Contact: Yachun WANG E-mail:3513596115@qq.com;wangyachun@cau.edu.cn

Abstract:

The study aimed to define first estrus expression traits after calving (FETs) of dairy cows based on information recorded by collars and to estimate their genetic parameters and relationships with other routine fertility traits. Data were collected from 35 519 Holstein cows across 8 farms in Ningxia from 2020 to 2023, comprising 272 589 811 high-throughput estrus records and 649 274 reproductive records. Three estrus expression traits were defined, including the duration of first estrus expression (DFE), the interval from calving to first estrus expression (ICE) and the mean of heat indicators of first estrus expression after calving (HIE). The GLM in SAS 9.2 was used to analyze the effects of various non-genetic factors on FETs, and the DMUAI module of DMU were used to estimate the genetic parameters of FETs by employing single-trait and multi-trait model. The averages for DFE, ICE, and HIE were 45.87 h, 80.25 au and 44.43 d, respectively. Parity, age at first service, day-night, farm, and year-season of calving had significant effects on all the 3 traits (P < 0.05). DFE was a trait with medium heritability (h2=0.139), while both ICE and HIE were low heritable traits (h2 < 0.1). Medium to high genetic correlations were observed between FETs (0.179 to 0.722) and between FETs and fertility traits (0.146-0.766). The collars-based information enables accurate quantification and monitoring of estrus expression in dairy cows, addressing the limitations of traditional recording methods. The FETs obtained from collars-based information are heritable and combining them with fertility traits can provide a new insight to improve genetic selection of estrus efficiency and fertility performance.

Key words: cow, fertility traits, first estrus expression after calving, genetic parameters

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