About Us

Bonnydale Black Simmentals is a family business built on hard work, patience, dedication and an unwavering and passionate commitment to our clients and to the Australian beef industry.

The business is operated by brothers Mike and Rob Introvigne and wives Julie and Diane trading as Introvigne Grazing Company. The original property has been in the family since 1936. Parents, Jim and Rita purchased the property from Rita’s parents in 1964 and registered the Bonnydale stud in 1974. The properties are situated 280 kilometres south of Perth (Western Australia) on top of the Darling Range in the Blackwood River valley district.

The operation consists of eight properties totalling 2000 hectares and located in the blue ribbon agricultural shire of Boyup Brook, 20 kilometres north east of Bridgetown. The 700–800mm rainfall covers the growing season, April/May to November. The undulating terrain is pastured with sub clovers and annual rye grasses.  The 880 cow herd is run at 1.1 hectares per cow/calf unit with the balance of the herd being 160 heifers.  Bulls are sold as yearlings at the annual on property sale held in early February each year.

The 850 hectare cropping program consists Cereals, Canola and Hay. The 2017 stud herd will see 350 Black Simmental and Simangus registered females calving with an additional 50 embryos implanted and with up to 110 stud heifers retained and being AI mated in 2016. All stud cows and heifers are given the opportunity to be artificially inseminated via a synchronised program. The stud expansion is due to continue, providing increased selection pressure on bulls for sale.

Rob & Diane Introvigne, Willie Altenburg and Julie and Mike Introvigne.

The Introvigne family have formed a breeding alliance with Willie and Sharon Altenburg, Altenburg Simmental ranch, Colorado, USA. With both businesses sharing the same philosophy when it comes to breeding cattle it has proven to be an ideal fit for the production of elite Simmental embryos for Bonnydale’s program. The mutual respect both families have for each other has led to a tremendous friendship. We look forward to working with Willie and Sharon for many years to come.