Nigel,

I assume you are referring to the Japanese Black cattle breed known as Wagyu in the U.S.

We performed a small serial ultrasound study at Iowa State University several years ago utilizing 1/2 Wagyu - 1/2 Angus steers.  We didn't have comparisons to straightbred Angus in this report, but the IMF levels were higher in the 1/2 Wagyu - 1/2 Angus steers than would have been expected for their weight, days on feed, and amount of subcutaneous fat cover in straightbred Angus cattle.

Units of measure in this publication are pounds and inches.

J R Tait

Article Growth and Development of Angus-Wagyu Crossbred Steers

Hi Nigel,

Yes - Steve Smith at TAM has and there is othe rpublished work.  Also a Wagyu conference soon in NSW, they have one every year.

All the best David

A small-scale study over three years on species-poor lowland grassland in the UK (Tallowin et al. 2005) found that at reduced grazing pressure, two cattle breeds created different sward structures and associated invertebrate assemblages (details not provided). Three grazing treatments were studied: commercial breed Charolais × Holstein-Friesian steers at moderate (maintaining 3,000 kg herbage dry matter mass/ha) or lenient (4,500 kg herbage dry matter mass/ha) grazing pressures and North Devon steers (traditional breed) at lenient grazing pressure. Treatments were applied from May to September and grasslands received no fertilizer during the study.

check this links maybe help you

http://www.farmingahead.com.au/wp-content/uploads/2016/10/FA103-75.pdf.pdf

https://pubag.nal.usda.gov/download/38520/PDF