This calculator is designed to approximate when you can expect animals to be born based on breeding dates.
Other critical time-points, such as the beginning of the third trimester, are also calculated for your convenience.
Animals can be unpredictable. Please use this as a general guideline only.
Lambing Season Duration:
17-day Estrus Periods:
47 Days Prior to Lambing (Third Trimester):
40 Days Post-Lambing (Peak Lactation):
Calving Season:
21-day Estrus Periods:
94 Days Prior to Calving (Third Trimester):
60 Days Post-Calving (Peak Lactation):
Foaling Season:
21-day Estrus Periods:
113 Days Prior to Foaling (Third Trimester):
40 Days Post-Foaling (Peak Lactation):
Issued in furtherance of extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Mandy Marney, Director, University of Wyoming Extension, College of Agriculture, Life Sciences and Natural Resources, University of Wyoming Extension, University of Wyoming, Laramie, Wyoming 82071. The University of Wyoming is an equal opportunity/affirmative action institution.