Regression of traits-other-than-production phenotypes for cows milked once a day on estimated breeding values obtained from cows milked twice a day

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dc.citation.volume79
dc.contributor.authorSneddon NW
dc.contributor.authorLopez-Villalobos N
dc.contributor.authorGarrick DJ
dc.contributor.authorRocha JF
dc.contributor.authorDonaghy DJ
dc.date.accessioned2024-01-15T23:46:21Z
dc.date.accessioned2024-07-25T06:47:38Z
dc.date.available2024-01-15T23:46:21Z
dc.date.available2024-07-25T06:47:38Z
dc.date.issued2019-06-17
dc.description.abstractThe use of traits other than production (TOP) to aid selection for conformation fit-for-purpose offspring becomes more important as once-a-day (OAD) milking for whole or part season becomes more common. In 2013 Massey University Dairy 1 farm transitioned their mixed-breed herd milked twice a day (TAD) to an OAD spring-calving system. All cows on the farm were scored for 14 inspector TOP traits and four farmer-scored traits for a total of 1,163 records over five seasons (168 to 254 cows per year). The scores were adjusted for age of the cow and season. The adjusted phenotypes for all cows for each trait were then regressed on their corresponding nationally-produced TAD estimated breeding values (EBV), which had been calculated without using these phenotypes. The four farmer-scored traits had the lowest relationships with EBV. Estimates of regression coefficients near one were observed for the udder traits (udder support, rear udder, front teats, udder overall), dairy conformation and body capacity. This supports the use of national EBVs in OAD herds derived mostly from records on daughters in TAD herds.
dc.description.confidentialfalse
dc.format.pagination140-143
dc.identifier.citationSneddon N, Lopez-Villalobos N, Garrick D, Rocha JF, Donaghy D. (2019). Regression of traits-other-than-production phenotypes for cows milked once a day on estimated breeding values obtained from cows milked twice a day. New Zealand Journal of Animal Science and Production. 79. (pp. 140-143).
dc.identifier.elements-typejournal-article
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70885
dc.publisherNZSAP
dc.relation.isPartOfNew Zealand Journal of Animal Science and Production
dc.rights(c) The author/sen
dc.rights.licenseCC BY-NC-NDen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.titleRegression of traits-other-than-production phenotypes for cows milked once a day on estimated breeding values obtained from cows milked twice a day
dc.typeJournal article
pubs.elements-id442460
pubs.organisational-groupOther
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