Major advances in determining appropriate selection goals

Journal of Dairy Science
G E Shook

Abstract

Substantial increases of 3,500 kg of milk, 130 kg of fat, and 100 kg of protein per cow per lactation have resulted from improvements in genetics, nutrition, and management during the past 20 yr. At the same time, the interval from calving to conception increased (unfavorable) by 24 d. Genetics has accounted for about 55% of gains in the yield traits and about one-third of the change in interval to conception. Genetic gains in the yield traits and productive life have accumulated to around 1.7 and 1.2 genetic standard deviations since 1980. Unfavorable genetic changes in conception interval since 1980 and somatic cell score since 1990 have accumulated to 1.0 and 0.12 genetic standard deviations. The most important advance in selection indexes has been the introduction of nonyield traits. Advances in selection indexes have gone hand in hand with advances in data collection and genetic evaluation. As new traits were recorded in dairy management databases and as genetic evaluations were developed for these traits, they were incorporated into selection indexes. Until 1994, when somatic cell score and productive life were introduced, selection indexes provided by USDA included only yield traits. In 2000, composite type indexes for u...Continue Reading

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Citations

Oct 20, 2011·The Journal of Dairy Research·Francisco Peñagaricano, Hasan Khatib
Jan 1, 2009·Irish Veterinary Journal·Rn Zadoks, Jl Fitzpatrick
Nov 13, 2013·Proceedings of the National Academy of Sciences of the United States of America·Mayumi SugimotoYoshikazu Sugimoto
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Jan 18, 2017·Genetics, Selection, Evolution : GSE·Kasper JanssenHans Komen
Apr 18, 2016·Journal of Dairy Science·M J VandeHaarR Veerkamp
Nov 7, 2017·Journal of Dairy Science·J B Cole, P M VanRaden
Nov 21, 2017·Journal of Dairy Science·Filippo MigliorChristine F Baes
Nov 21, 2017·Journal of Dairy Science·L H BaumgardD E Bauman
Jan 26, 2008·Journal of Dairy Science·A De VriesG Rogers
Nov 26, 2010·Journal of Dairy Science·A R KhanalJ MacDonald
Mar 21, 2007·Journal of Dairy Science·J BohmanovaJ B Cole
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Nov 20, 2009·Journal of Dairy Science·E P Cunningham, H Tauebert
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Dec 7, 2013·Reproduction, Fertility, and Development·Stephen T Butler
Sep 16, 2019·Journal of Dairy Science·Joel Ira WellerMichael van Straten

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