where PT represents the number of days after calving at which the lactation peak is reached. In this case the maximum daily peak yield (PY) is estimated by insertion of the value obtained into equation [1]. The estimated milk yield in an arbitrary period (M) is expressed with a determined integral [equation 3
Modeling lactation curve standards for test-day milk yield in holstein, Brown Swiss and simmental cows (PDF Download Available). Available from: https://www.researchgate.net/publication/285936241_Modeling_lactation_curve_standards_for_test-day_milk_yield_in_holstein_Brown_Swiss_and_simmental_cows [accessed May 2, 2016].