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Breed Average
Gestation
Length in Days
Variance*

Holstein

280  

Ayrshire

282 +2

Brown Swiss

288 +8

Guernsey

286 +6

Jersey

279 -1

Milking Shorthorn

283 +3

Angus

283 +3

Hereford

288 +8

Limousin

289 +9

Brangus

290 +10

Gelbvieh

287 +7

Simmental

287 +7

Charalais

286 +6

*Add or subtract this number of days from "due date" 

Please remember that all due dates are based on breed averages.
Each animal's gestation length and heat cycle varies slightly.
Always watch for signs of heat a few days before and after the next expected heat date. 

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