Development of an index to rank dairy females on expected lifetime profit

Journal of Dairy Science
M M KelleherD P Berry

Abstract

The objective of this study was to develop an index to rank dairy females on expected profit for the remainder of their lifetime, taking cognizance of both additive and nonadditive genetic merit, permanent environmental effects, and current states of the animal including the most recent calving date and cow parity. The cow own worth (COW) index is intended to be used for culling the expected least profitable females in a herd, as well as inform purchase and pricing decisions for trading of females. The framework of the COW index consisted of the profit accruing from (1) the current lactation, (2) future lactations, and (3) net replacement cost differential. The COW index was generated from estimated performance values (sum of additive genetic merit, nonadditive genetic merit, and permanent environmental effects) of traits, their respective net margin values, and transition probability matrices for month of calving, survival, and somatic cell count; the transition matrices were to account for predicted change in a cow's state in the future. Transition matrices were generated from 3,156,109 lactation records from the Irish national database between the years 2010 and 2013. Phenotypic performance records for 162,981 cows in the ye...Continue Reading

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Citations

Jan 19, 2016·Journal of Dairy Science·P M VanRaden
Apr 24, 2018·Journal of Animal Science·Nóirín McHughDonagh P Berry
Sep 10, 2019·Journal of Dairy Science·D P BerryF Hely
Feb 7, 2020·Animal : an International Journal of Animal Bioscience·A De Vries, M I Marcondes
Jun 20, 2018·Acta Veterinaria Scandinavica·Karin AlvåsenUlf Emanuelson
Jul 27, 2020·Translational Animal Science·Michelle M JudgeDonagh P Berry
Apr 26, 2020·Journal of Dairy Science·P M VanRaden
May 4, 2017·Animal : an International Journal of Animal Bioscience·N C FriggensL Puillet
Nov 11, 2019·Journal of Dairy Science·E M M van der HeideB J Ducro

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