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Heat stress on breeding value prediction for milk yield and composition of a Brazilian Holstein cattle population.

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Title: Heat stress on breeding value prediction for milk yield and composition of a Brazilian Holstein cattle population.
Authors: Salvian, Mayara1 (AUTHOR), Silveira, Robson Mateus Freitas1 (AUTHOR), Petrini, Julina1 (AUTHOR), Rovadoscki, Gregori Alberto1 (AUTHOR), Iung, Laiza Helena de Souza1 (AUTHOR), Ramírez-Díaz, Johanna1 (AUTHOR), Carrara, Eula Regina1 (AUTHOR), Pertile, Simone Fernanda Nedel1 (AUTHOR), Cassoli, Laerte Dagher1 (AUTHOR), Machado, Paulo Fernando1 (AUTHOR), Mourão, Gerson Barreto1 (AUTHOR) gbmourao@usp.br
Source: International Journal of Biometeorology. Feb2023, Vol. 67 Issue 2, p347-354. 8p.
Subject Terms: *Milk yield, *Holstein-Friesian cattle, *Composition of milk, *Dairy cattle, *Physiological effects of heat, *Unsaturated fatty acids, *Agricultural productivity
Abstract: Due to the high milk production of Holstein cows, many countries have chosen to import semen to improve local dairy herds. This strategy would be more effective if this semen was used in the same environment conditions in which the bulls were selected. If the effect of genotype by environment (G × E) interaction is not considered, the estimated breeding values (EBVs) may vary, potentially reducing the selection response. We evaluate the impact of heat stress on selection for milk yield and composition of Holstein cows using random regression models. To verify the interference of heat stress in milk yield (MY) and composition traits (fat, protein, total saturated, and total unsaturated fatty acids content in milk), temperature–humidity index (THI) on test-day milk records was used. The threshold value to divide the environments using test-day information from Brazilian Holstein cows was 72 units of THI, i.e., < 72 represented no heat stress and > 72 represented heat stress. Legendre polynomials of second-order (Leg 2) model and two lactation points (33 and 122 DIM) were used to estimate heritabilities and EBVs for five important dairy traits. The heritabilities of milk components and fatty acids were low (0.09–0.29), regardless of lactation period and degree of heat stress, with the exception of protein content (0.30–0.35). Fat content was the only milk component that was reduced according to the degree of heat stress and lactation period. The EBVs tended to decrease in heat stress conditions, thus animals with high genetic potential demonstrated evidence of G × E interaction. However, acclimatization of dairy cows to heat stress in the farm production systems may have been responsible for the low differences among genetic parameters and EBVs with and without heat stress found in this study. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Label: Title
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  Data: Heat stress on breeding value prediction for milk yield and composition of a Brazilian Holstein cattle population.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Salvian%2C+Mayara%22&quot;&gt;Salvian, Mayara&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Silveira%2C+Robson+Mateus+Freitas%22&quot;&gt;Silveira, Robson Mateus Freitas&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Petrini%2C+Julina%22&quot;&gt;Petrini, Julina&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Rovadoscki%2C+Gregori+Alberto%22&quot;&gt;Rovadoscki, Gregori Alberto&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Iung%2C+Laiza+Helena+de+Souza%22&quot;&gt;Iung, Laiza Helena de Souza&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ram&#237;rez-D&#237;az%2C+Johanna%22&quot;&gt;Ram&#237;rez-D&#237;az, Johanna&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Carrara%2C+Eula+Regina%22&quot;&gt;Carrara, Eula Regina&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Pertile%2C+Simone+Fernanda+Nedel%22&quot;&gt;Pertile, Simone Fernanda Nedel&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Cassoli%2C+Laerte+Dagher%22&quot;&gt;Cassoli, Laerte Dagher&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Machado%2C+Paulo+Fernando%22&quot;&gt;Machado, Paulo Fernando&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mour&#227;o%2C+Gerson+Barreto%22&quot;&gt;Mour&#227;o, Gerson Barreto&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; gbmourao@usp.br&lt;/i&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22International+Journal+of+Biometeorology%22&quot;&gt;International Journal of Biometeorology&lt;/searchLink&gt;. Feb2023, Vol. 67 Issue 2, p347-354. 8p.
– Name: Subject
  Label: Subject Terms
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  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Milk+yield%22&quot;&gt;Milk yield&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Holstein-Friesian+cattle%22&quot;&gt;Holstein-Friesian cattle&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Composition+of+milk%22&quot;&gt;Composition of milk&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Dairy+cattle%22&quot;&gt;Dairy cattle&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Physiological+effects+of+heat%22&quot;&gt;Physiological effects of heat&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Unsaturated+fatty+acids%22&quot;&gt;Unsaturated fatty acids&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Agricultural+productivity%22&quot;&gt;Agricultural productivity&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Due to the high milk production of Holstein cows, many countries have chosen to import semen to improve local dairy herds. This strategy would be more effective if this semen was used in the same environment conditions in which the bulls were selected. If the effect of genotype by environment (G &#215; E) interaction is not considered, the estimated breeding values (EBVs) may vary, potentially reducing the selection response. We evaluate the impact of heat stress on selection for milk yield and composition of Holstein cows using random regression models. To verify the interference of heat stress in milk yield (MY) and composition traits (fat, protein, total saturated, and total unsaturated fatty acids content in milk), temperature–humidity index (THI) on test-day milk records was used. The threshold value to divide the environments using test-day information from Brazilian Holstein cows was 72 units of THI, i.e., &lt; 72 represented no heat stress and &gt; 72 represented heat stress. Legendre polynomials of second-order (Leg 2) model and two lactation points (33 and 122 DIM) were used to estimate heritabilities and EBVs for five important dairy traits. The heritabilities of milk components and fatty acids were low (0.09–0.29), regardless of lactation period and degree of heat stress, with the exception of protein content (0.30–0.35). Fat content was the only milk component that was reduced according to the degree of heat stress and lactation period. The EBVs tended to decrease in heat stress conditions, thus animals with high genetic potential demonstrated evidence of G &#215; E interaction. However, acclimatization of dairy cows to heat stress in the farm production systems may have been responsible for the low differences among genetic parameters and EBVs with and without heat stress found in this study. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s00484-022-02413-z
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 347
    Subjects:
      – SubjectFull: Milk yield
        Type: general
      – SubjectFull: Holstein-Friesian cattle
        Type: general
      – SubjectFull: Composition of milk
        Type: general
      – SubjectFull: Dairy cattle
        Type: general
      – SubjectFull: Physiological effects of heat
        Type: general
      – SubjectFull: Unsaturated fatty acids
        Type: general
      – SubjectFull: Agricultural productivity
        Type: general
    Titles:
      – TitleFull: Heat stress on breeding value prediction for milk yield and composition of a Brazilian Holstein cattle population.
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            NameFull: Salvian, Mayara
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            – D: 01
              M: 02
              Text: Feb2023
              Type: published
              Y: 2023
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