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Animal Science Database

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Abstract

A retrospective study of the impact of the estimated breeding values of sires and maternal grandsires for somatic cell score (SCS) on productive life (PL) of Holsteins and Jerseys was conducted. Data included records from 2,626,425 Holstein and 142,725 Jersey cows. The sires and maternal grandsires ...

Author(s)
Miller, R. H.; Norman, H. D.; Wright, J. R.; Cole, J. B.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 5, pp 2224-2228
Abstract

Four US genetic-economic indices for dairy cattle were retrofitted to illustrate differences in phenotypic response observed for retrospective selection over 2 generations for currently evaluated traits, even though producers did not have evaluations available at the time for direct selection for...

Author(s)
Norman, H. D.; Wright, J. R.; Miller, R. H.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 6, pp 2695-2702
Abstract

Use of sexed semen for artificial insemination of US Holstein heifers (1.3 million breedings) and cows (10.8 million breedings) in Dairy Herd Improvement herds was characterized by breeding year, parity, service number, region, herd size, and herd milk yield. Sexed semen was used for 1.4, 9.5, and...

Author(s)
Norman, H. D.; Hutchison, J. L.; Miller, R. H.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 8, pp 3880-3890
Abstract

Reproductive information since 1995 from the USDA national dairy database was used to calculate yearly Holstein and Jersey means for days to first breeding after calving (DFB), 70-d nonreturn rate, conception rate (CR), number of breedings per lactation (NB), interval between first and last...

Author(s)
Norman, H. D.; Wright, J. R.; Hubbard, S. M.; Miller, R. H.; Hutchison, J. L.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 7, pp 3517-3528
Abstract

Progeny-group means of Predicted Difference milk yield, Predicted Difference fat yield, percentage of daughters with incomplete 1st lactations, and Descriptive Type were studied for 417 Holstein active A.I. sires which were production summarised in 1969-70. Three multiple regression analyses were...

Author(s)
MILLER, R. H.; HOOVEN, N. W., Jr.; SMITH, J. W.
Publisher
Anim. Sci. Res. Div., U.S.D.A., Beltsville, Md.,
Citation
Journal of Dairy Science, 1971, 54, pp 1096-1102
Abstract

D.H.I.A. data representing 24, 853 daughter-dam comparisons for 263 Holstein A.I. sires were studied to determine the usefulness of information on a sire's mates (dams of daughters) in sire evaluation. Although there was a mean bias of 41 lb. of milk per sire due to selection of mates, the relative ...

Author(s)
MILLER, R. H.; CORLEY, E. L.
Citation
Journal of Dairy Science, 1965, 48, pp 580-586