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Gestation in sheep varies from 142 to 152 days with the average being 147 days. Just like people, individual pregnancies can vary, gestation periods of 138 to 159 days are not unheard of. Ewes carrying multiple lambs tend to have shorter gestations while male lambs (and heavy birth weight lambs) are usually carried for longer than female lambs. The form above calculates the lambing date based on a 147 day gestation period.

Lambing Due-Date Calculator:

Enter Date of Breeding:   
(MM/DD/YYYY format)  
Expected Lambing Date:   
Range of Lambing Dates:

© All rights reserved Tennessee Sheep Producers Association, images property of TSPA can’t be used without permission. Information provided is for information only and is the opinion of the author. TSPA tries to regularly update and add information to the web site, but makes no warranties (express or implied) about the information on the web site. It is the user’s responsibility to evaluate the accuracy and completeness of any content appearing on the web site.