Pilot Study to Evaluate the Association Between the Length of the Luteal Phase and Estrous Activity Detected by Automated Activity Monitoring in Dairy Cows

Frontiers in Veterinary Science
J Denis-RobichaudRonaldo L Aoki Cerri

Abstract

The ability of automated activity monitoring (AAM) systems to detect estrus is influenced by multiple variables. The luteal phase (LP) preceding estrus has been shown to be important for hormones release, and behavior during estrus in ruminants, but its impact on activity as measured by AAM systems has not been studied. The objective of this study was to investigate the impact of the length of the preceding LP on the intensity and duration of estrus as measured by AAM, and on the expression of estrogen receptor alpha (ERα) in the endometrium. A total of 60 cows between 46 and 53 days in milk were assigned to either a normal or a short length LP. Length of the LP was insured by the use of hormonal synchronization programs. Cows in both treatments were matched on parity, milk production, body condition score (BCS), and lameness score (assessed at enrolment). Expression of ERα receptors in the endometrium were evaluated by nuclear staining by immunohistochemistry of biopsies. Estrus was defined as the day on which the AAM system detected estrus. Cows that were not synchronized by the protocol or that were not detected in estrus by the AAM systems were excluded, which left 21 and 11 cows for analyses in the normal and short length ...Continue Reading

References

Feb 1, 1977·Journal of Dairy Science·C A Kiddy
Sep 1, 1969·The Journal of Endocrinology·M J Carrick, J N Shelton
Dec 1, 1993·American Journal of Epidemiology·G Maldonado, S Greenland
Feb 11, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Ronaldo L A CerriJosé E P Santos
Jan 12, 2010·Journal of Dairy Science·P Løvendahl, M G G Chagunda
Jul 7, 2011·The Veterinary Record·A HolmanH Dobson

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