Hassan Nawaz
Hassan Nawaz, Publisher.
Hassan Nawaz is an engineer (B.Sc. Electrical Engineering) who builds and publishes GestationPeriod. He is not a veterinarian. The figures come from university extension services and published breed data for gestation lengths, and each page names its sources. Every calculator is tested against worked examples before it goes live.
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What I write here
I write and test every calculator on GestationPeriod, check each formula against the published standard or reference table it comes from, and update pages when those standards change.