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| Garmo, Randi T.; Martin, A.D.; Thuen, E.; Havrevoll, Ø.; Steinshamn, H.; Prestløkken, E.; Randby, Å.; Eknæs, M.; Waldmann, A.; Reksen, O.. |
| Progesterone profiles in Norwegian Red cows were categorized, and associations between the occurrence of irregularities in the profiles and the commencement of luteal activity were investigated. The cows were managed in 3 feeding trials from 1994 to 2001 and from 2005 to 2008 at the Norwegian University of Life Sciences. The cows were followed from calving, and the milk samples collected represented 502 lactations from 302 cows. Milk samples for progesterone analysis were taken 3 times weekly from 1994 throughout 1998 and from 2005 to 2008 and 2 times weekly from 1999 to 2001. Commencement of luteal activity was defined as the first day of 2 consecutive measurements of progesterone concentration ≥3 ng/mL not earlier than 10 d after calving. Delayed... |
| Tipo: Journal paper |
Palavras-chave: Dairy cattle; Production systems; Animal husbandry; Breeding and genetics. |
| Ano: 2009 |
URL: http://orgprints.org/16851/1/Garmo_etal_2009_prog_profiles_NRF.pdf |
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