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Animal Science Database

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Abstract

Genetic improvement in sires used for artificial insemination (AI) is increasing faster compared with a decade ago. The genetic merit of replacement heifers is also increasing faster and the genetic lag with older cows in the herd increases. This may trigger greater cow culling to capture this...

Author(s)
Vries, A. de
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 5, pp 4184-4192
Abstract

The objective was to compare the costs of natural service (NS) and timed artificial insemination (TAI) as breeding programs for dairy cows. Both programs were directly compared in a field study from November 2006 to March 2008. Reproductive results in that study were similar and served as inputs...

Author(s)
Lima, F. S.; Vries, A. de; Risco, C. A.; Santos, J. E. P.; Thatcher, W. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 9, pp 4404-4413
Abstract

Background: Results regarding the use of bovine somatotropin for enhancing fertility in dairy cattle are variable. Here, the hypothesis was tested that a single injection of a sustained-release preparation of bovine somatotropin (bST) during the preovulatory period would improve pregnancy success...

Author(s)
Bell, A.; Rodríguez, O. A.; Castro e Paula, L. A. de; Padua, M. B.; Hernández-Ceró, J.; Gutiérrez, C. G.; Vries, A. de; Hansen, P. J.
Publisher
BioMed Central Ltd, London, UK
Citation
BMC Veterinary Research, 2008, 4, 22, pp (26 June 2008)
Abstract

Effects of artificial insemination (AI) and natural service (NS) breeding systems on pregnancy rates (PR) by stage of lactation, season, and changes in milk production over time were examined using lactation and herd DHIA records of Holstein cows in dairy herds located in Florida and Georgia. The...

Author(s)
Vries, A. de; Steenholdt, C.; Risco, C. A.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2005, 88, 3, pp 948-956

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