Eric Zwiefelhofer

PhD, Bovine repro guy; Postdoctoral researcher using advanced reproduction for bison conservation at the Toronto Zoo and University of Saskatchewan

[Eric Zwiefelhofer @ericzwief]

Who doesn't love cute calves? Awesome seeing the babies after our hard work during this research project. Thanks again to @STgenetics for their support of this project! @MitacsCanada @WCVMToday

[The Toronto Zoo @TheTorontoZoo]

If you have visited our Canadian Domain recently, you may have seen three wood bison calves born the week of June 20th 🦬 What makes these little ones extra special is the innovative reproductive techniques that enabled us to deliberately produce females 🔬🦬

[Eric Zwiefelhofer @ericzwief]

As part of a trial during my postdoc, I artificially inseminated the wood bison at The Toronto Zoo with sperm that was sorted for the x-chromosome sperm (to create ~90% female offspring). @STgenetics @WCVMToday @MitacsCanada

[The Toronto Zoo @TheTorontoZoo]

We are excited to announce that four of our wood bison are pregnant as part of a year-long reproductive study for this threatened species! 🦬🔬 Read more: https://t.co/7iSvyJ1vdW #savingspecies

[Miranda Zwiefelhofer @Miranda_Zw]

If you are interested in learning more about bison consider checking out the new book, The Ecological Buffalo. It was written by 2 of the best bison experts in the business and my personal friends! Pre-order now.
https://t.co/va50jskbwm

#bison #conservation #wildlifephotography

[Miranda Zwiefelhofer @Miranda_Zw]

Congrats to our summer student Ella on a great job with first place with our bison work. 🦬 #research #bison

[Eric Zwiefelhofer @ericzwief]

@rjbisonranch Thanks Robert!

[Eric Zwiefelhofer @ericzwief]

Excited to present on the wood bison this Monday.

[The Toronto Zoo @TheTorontoZoo]

Join us for a Research Symposium webinar with @MitacsCanada on Monday, August 23rd from 9-10am EST. You'll learn about various animal research and technologies from Dr. Gabriela Mastromonaco, Dr. Jenna Congdon, and Dr. Eric Zwiefelhofer. For details, visit https://t.co/lmNVP8EvVA

[Eric Zwiefelhofer @ericzwief]

Excellent article written by Jessie Hellquist, last year's summer student in our lab. This is why we do the research we do, to preserve the threatened wood bison. @Miranda_Zw @TheTorontoZoo @MitacsCanada @CanadianBisonAs

[WCVM Today @WCVMToday]

Researchers at the @LFCE_usask are welcoming Skeeter and Mo to their bison population. The two male calves mark a significant achievement in developing a diverse germplasm biobank. @InnovationCA https://t.co/LSi1lPPpbs

[Eric Zwiefelhofer @ericzwief]

Who doesn't love breeding cows with good people. Crossing my fingers for good preg rates - they sure felt good. Thanks to @K_Nielsen2 @ECornand @carolynfitzs and @DrBart_Beef for all the hard work.

[Livestock & Forage Centre of Excellence @LFCE_usask]

It's #breeding time at the #LFCE. @ericzwief, @ECornand, and @K_Nielsen2 are working hard with @UAlberta's @carolynfitzs to #AI #cows to be used in a trial with @DrBart_Beef. This year, they are using bulls Ellingson Enterprise 3190 & S A V Influence 4043.

[Eric Zwiefelhofer @ericzwief]

Getting geared up to AI some beef cows - good thing next week is looking a bit cooler.

[Dr Bart Lardner 🇨🇦 @DrBart_Beef]

Day 0 - 5d Cosynch+PRID #TimedAI @ericzwief #CanolaStudy @KlutzKaitlyn @TessMills_ @KylieGrimes6 Erika Cornand @LFCE_usask

[Eric Zwiefelhofer @ericzwief]

Well deserved! An excellent researcher and an even better person. Congrats Rodrigo!

[WCVM Today @WCVMToday]

WCVM reproduction scientist Dr. Rodrigo Carrasco won a #USask Governor General’s Gold Medal. Carrasco received the award for his graduate work on nerve growth factor secretion in llamas. @USaskHealthSc https://t.co/5ykcuZM1Ve

[Eric Zwiefelhofer @ericzwief]

It's interesting to see them standing side-by-side. Good example. Lucky my wife has eagle eyes 👀😆

[Miranda Zwiefelhofer @Miranda_Zw]

I happened upon this prime example of the morphological differences between Wood bison (on left) and Plains bison (on right). #bison #subspecies

A few differences include:
1⃣Hump shape (square vs rounded)
2⃣Forehead hair (long and straight vs fuzzy)
3⃣Chap hair (short vs long)

[Miranda Zwiefelhofer @Miranda_Zw]

Eric Zwiefelhofer @ericzwief and I were asked to write a guest blog for Buffalo Tales and Trails on "Assisted Reproduction in Bison". Check it out!

#bison #wildlife #conservation #reproduction

https://t.co/wGHRkjjCDc

[Eric Zwiefelhofer @ericzwief]

Collaboration is the driver of research. Special thanks to @STgenetics, @TheTorontoZoo, @usask, @MitacsCanada, and @LFCE_usask for helping to make this happen. Humbled to be a part of this.

[STgenetics @STgenetics]

A team of researchers from USask and The Toronto Zoo, in collaboration with the sperm-sorting leader STgenetics, has produced the first female wood bison pregnancy with sex-sorted semen. Learn more at: https://t.co/IsJizE4224 #STgenetics #4M

[The Toronto Zoo @TheTorontoZoo]

USask researchers alongside the Zoo's Director of Conservation Science, Dr. Gabriela Mastromonaco, have successfully produced the first female pregnancy with sex-sorted sperm!

Learn more: https://t.co/YKMUX0gy5l #savingspecies

[Miranda Zwiefelhofer @Miranda_Zw]

Busy week in the IVF lab! Here are some cattle IVF embryos produced in my quality control run. Gearing up for lots of bison oocyte collections and IVF runs this summer! @ericzwief @usask @WCVMToday #embryos #research #reprorocks #phd

[Eric Zwiefelhofer @ericzwief]

@CarlLippert Haha thanks Carl!

[Eric Zwiefelhofer @ericzwief]

@rjbisonranch Thanks Robert - it definitely takes a good team.

[Eric Zwiefelhofer @ericzwief]

Very exciting stuff happening with the bison project! First confirmed female pregnancy derived from sex-sorted sperm in our research herd. @LFCE_usask @TheTorontoZoo @STgenetics @MitacsCanada @WCVMToday https://t.co/641UzKV2Lw

[Eric Zwiefelhofer @ericzwief]

Really proud of our new publication. We showed that a PRID-Delta tended to increase pregnancy per artificial insemination compared to a CIDR following fixed-time artificial insemination in beef cattle. @LFCE_usask @WCVMToday @IETS_org @SaskCattlemens
https://t.co/bcijUKWX6B

[Diego @DiegoMoyaSask]

I am still looking for graduate students to fulfill two Master's positions. Would you please help me spread the word? https://t.co/EMORAe5JOY