Anestrus, Postpartum, corpus luteum

Persistant corpus luteum
I use the model of Peter et al. (2009) to classify the postpartum anestrus cases. It is important to observe the reproductive performance during postpartum period in dairy cattle to avoid the economic loss that is caused by prolonged days-open.
Prolonged anestrus postpartum in dairy cattle is a common problem during hot season (De la Sota et al., 1998) that causes high economic loss (Meadows et al., 2005).
 
Here is an example of a case of postpartum anestrus: PERSISTENT CORPUS LUTEUM; it was confirmed by the second ultrasonography observation in a 5/8 Girolando cow (42 days postpartum), with interval of 9 days between two observations (Figure 1.).
 
Well, there are many factors that cause persistent corpus luteum.
You may leave the factors and suggest treatments in a comment!
 

 
 



 
References
 
De la Sota, R. L., Burke, J. M., Risco, C. A., Moreira, F., DeLorenzo, M. A., & Thatcher, W. W. (1998). Evaluation of timed insemination during summer heat stress in lactating dairy cattle. Theriogenology, 49(4), 761-770. 
 
Meadows, C., Rajala-Schultz, P. J., & Frazer, G. S. (2005). A spreadsheet-based model demonstrating the nonuniform economic effects of varying reproductive performance in Ohio dairy herds. Journal of dairy science, 88(3), 1244-1254.
 
Peter, A. T., Vos, P. L. A. M., & Ambrose, D. J. (2009). Postpartum anestrus in dairy cattle. Theriogenology, 71(9), 1333-1342.

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