Optimal value for the exponential term of Wilmink's function according to current Holstein lactation curves in Japan
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Description
We compared values of Wilmink's exponential term to describe the lactation curves of Holstein cows in Japan. Data were a total of 100,971,798 test-day records from the first through fifth parities during 1991 through 2018. The lactation curve model used fourth-order Legendre polynomials and Wilmink's exponential term. In total, 810 analyses were executed to compare six values (−0.02, −0.03, …, −0.07) for the exponential term to select the one that yielded the smallest root mean square error. For all parities, daily milk yield and lactation persistency increased consistently and peak lactation days occurred later from year to year. For the years evaluated, the optimal exponential term was −0.05 for first and second parities, −0.04 for third parity, and −0.03 for fourth and fifth parities. The change in the exponential parameter with increasing year was related to delays in peak lactation. © 2022 Japanese Society of Animal Science.
Journal
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- Animal Science Journal
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Animal Science Journal 93 (1), e13776-, 2022
John Wiley and Sons
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Details 詳細情報について
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- CRID
- 1050858441648856192
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- NII Book ID
- AA11677214
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- ISSN
- 13443941
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB