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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...
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