Genetic relationship of energy balance predicted from milk traits with fertility in Japanese Holsteins

We predicted the energy balance of cows from milk traits and estimated the genetic correlations of predicted energy balance (PEB) with fertility traits for the first three lactations. Data included 9,646,606 test-day records of 576,555 Holstein cows in Japan from 2015 to 2019. Genetic parameters wer...

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Bibliographic Details
Published inAnimal science journal Vol. 95; no. 1; p. e13968
Main Authors Nishiura, Akiko, Sasaki, Osamu, Yamazaki, Takeshi, Yamaguchi, Shigeki, Hagiya, Koichi, Nakagawa, Satoshi, Abe, Hayato, Nakahori, Yuka, Saito, Yuriko, Tatebayashi, Ryoki, Masuda, Yutaka
Format Journal Article
LanguageEnglish
Published Australia 01.01.2024
Subjects
Animals
Cattle - genetics
Cattle - metabolism
Cattle - physiology
East Asian People
Energy Metabolism - genetics
Female
Fertility - genetics
Fertilization - genetics
Japan
Lactation - genetics
Milk - metabolism
Quantitative Trait, Heritable
Japan
energy balance
dairy cow
genetic parameter
fertility
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Summary:We predicted the energy balance of cows from milk traits and estimated the genetic correlations of predicted energy balance (PEB) with fertility traits for the first three lactations. Data included 9,646,606 test-day records of 576,555 Holstein cows in Japan from 2015 to 2019. Genetic parameters were estimated with a multiple-trait model in which the records among lactation stages and parities were treated as separate traits. Fertility traits were conception rate at first insemination (CR), number of inseminations (NI), and days open (DO). Heritability estimates of PEB were 0.28-0.35 (first lactation), 0.15-0.29 (second), and 0.09-0.23 (third). Estimated genetic correlations among lactation stages were 0.85-1.00 (first lactation), 0.73-1.00 (second), and 0.64-1.00 (third). Estimated genetic correlations among parities were 0.82-0.96 (between first and second), 0.97-0.99 (second and third), and 0.69-0.92 (first and third). Estimated genetic correlations of PEB in early lactation with fertility were 0.04 to 0.19 for CR, -0.03 to -0.19 for NI, and -0.01 to -0.24 for DO. Genetic improvement of PEB is possible. Lower PEB in early lactation was associated with worse fertility, suggesting that improving PEB in early lactation may improve reproductive performance.
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ISSN:1344-3941
1740-0929
1740-0929
DOI:10.1111/asj.13968