Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (11): 3089-3098.doi: 10.11843/j.issn.0366-6964.2021.011.010

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Genetic Analysis on Skinfold Thickness and Body Condition Score Traits in Holstein Cows

ZHANG Hailiang1, CHANG Yao1, MU Baiyu1, WANG Kai1, YANG Minglu1,2, WANG Lei1,2, MA Longgang1,2, NING Jingyang1, GUO Gang3, WANG Yachun1*   

  1. 1. 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. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    3. Beijing Sunlon Livestock Development Co., Ltd, Beijing 100029, China
  • Received:2021-03-08 Online:2021-11-23 Published:2021-11-24

Abstract: In this study, the skinfold thickness over the neck (STN), rib (STR) and udder (STU) of Holstein cows (referred to as neck, ribs and breast skinfold thickness, respectively) and body condition score (BCS) were measured in a large population. The purpose was to explore the population characteristics of skinfold thickness in different body positions and BCS, and to estimate the genetic parameters of skinfold thickness in different body positions and BCS of Holstein cows by modeling. The STN, STR, STU and BCS of 10 915 lactating Holstein cows from 12 dairy farms were measured in summer from 2017 to 2020. The single-trait and four-trait animal models were employed to perform genetic analysis, and heritabilities and genetic correlations for STN, STR, STU and BCS were obtained. Furthermore, the approximate genetic correlations between skinfold thickness, BCS and important functional traits (longevity and reproduction traits) were calculated. The results showed that the STU, STN, STR and BCS in Holstein cows were (7.49±1.45) mm, (7.27±1.34) mm, (11.74±1.90) mm and (2.94±0.79), respectively. There were moderate heritabilities for STN (0.15) and STU (0.11), and moderate to high heritabilities for STR (0.28) and BCS (0.22). The moderate to high genetic correlations among the skinfold thickness over the different body positions were found, ranging from 0.21 (STN and STU) to 0.69 (STN and STR). There was a large variation for genetic correlations between BCS and skinfold thickness over the different body positions, ranging from -0.25 (BCS and STU) to 0.28 (BCS and STN). The moderate genetic correlations between skinfold thickness, BCS and some functional traits were found. In this study, the genetic analysis on skinfold thickness and BCS traits were performed, and the heritabilities and genetic correlations for skinfold thickness over the different body positions and BCS were estimated. The results from the current study could help us understand the genetic foundation for fat deposition in dairy cattle, and was beneficial for balance breeding in Chinese Holstein population.

Key words: dairy cow, skinfold thickness, body fat deposition, genetic parameter, genetic evaluation

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