Journal article
Short communication: Characterization of early postpartum estrous behavior and ovulation in lactating dairy cows using radiotelemetry
Journal of dairy science, Vol.95(9), pp.5085-5088
09/2012
Handle:
https://hdl.handle.net/2376/105033
PMID: 22916912
Abstract
The objective of this study was to describe early postpartum estrous behavior and ovulation in lactating dairy cows using radiotelemetry. Cows (n=50) were continuously monitored for behavioral estrus with a radiotelemetric system, HeatWatch II (CowChips LLC, Manalapan, NJ), from d 14 to approximately d 49 postpartum. Blood collection for analysis of progesterone and ovarian ultrasonography were performed once weekly starting on d 14. First ovulation was associated with behavioral estrus in 5 cows and occurred at 28.2±10.8d (mean±SD; range 17 to 40d). The average duration of estrus was 6.0±4.9h (range 3 to 12.2h), and the mean number of standing events was 18.4±8.9 (range 4 to 26). Based on progesterone concentrations of ≥1ng/mL, estimated first postpartum ovulation occurred at 25.1±10.4d (range 10 to 49d) for 38 animals without evidence of behavioral estrus. The interval to estimated first ovulation without behavioral estrus was not different from the interval to first ovulation associated with behavioral estrus. Level of milk production and body condition score loss did not affect the interval to estimated first ovulation without estrus or first ovulation associated with estrus. Six animals did not show evidence of ovulation based on progesterone concentration, whereas 1 cow showed evidence of estrous behavior on the day before removal from the study. The majority of first postpartum ovulations (38/43; 88.4%) were not associated with behavioral estrus.
Metrics
7 Record Views
Details
- Title
- Short communication: Characterization of early postpartum estrous behavior and ovulation in lactating dairy cows using radiotelemetry
- Creators
- C.R Johnson - Animal and Veterinary Science Department, University of Idaho, Moscow 83844M.W Ayers - Animal and Veterinary Science Department, University of Idaho, Moscow 83844A Ahmadzadeh - Animal and Veterinary Science Department, University of Idaho, Moscow 83844B Shafii - Statistical Programs, College of Agriculture and Life Sciences, University of Idaho, Moscow 83844S Etter - University of Idaho Extension, Caldwell 83605R.C Chebel - Veterinary Population Medicine Department, College of Veterinary Medicine, University of Minnesota, St. Paul 55108J.C Dalton - Animal and Veterinary Science Department, University of Idaho, Moscow 83844
- Publication Details
- Journal of dairy science, Vol.95(9), pp.5085-5088
- Academic Unit
- UNKNOWN
- Publisher
- Elsevier Inc
- Identifiers
- 99900546867601842
- Language
- English
- Resource Type
- Journal article