Lactation curves in monitoring cows’ resilience

VAŘEKA, Jan, ZAVADILOVÁ, Ludmila a KAŠNÁ, Eva., 2023 Lactation curves in monitoring cows’ resilience. In Book of Abstracts of the 1st Regional Meeting of the European Federation of Animal Science. Nitra, Slovakia: Slovak University of Agriculture in Nitra, Slovakia, s. 39. ISSN
Year2023
CathegoryOthers
Internal link23069.pdf
Abstract

The study used Legendre polynomials to describe lactation curves and monitor dairy cows’ resilience. Daily milk yield observations (DMY) were analysed from 510 purebred Holstein and 165 Czech purebred Fleckvieh cows. There were monitored via Affimilk software on a farm from 1998 to 2020. The original database included 767 577 observations from 946 dairy cows and 2 795 lactations. After the data edit, it contained 527 966 DMY and 1 839 lactations from cows with days in milk (DIM) from 1 – 305. The highest completed lactation was the eighth. Individual cows’ Persistence of Milk Production (PMP) was calculated and then computed to the average PMP by breed and lactation.