Beefing up cow size and profits without increasing herd size is every farmer’s dream.

Dr Viv Perry, from the UQ School of Veterinary Science Pastoral Veterinary Centre at Goondiwindi, is manipulating the protein intake of cows during pregnancy to see if it increases beef calf weaning weights.

Dr Perry has already demonstrated that protein supplementation directly affects placental growth and that varied maternal protein intake results in changes in calf growth and body composition at six months.

Her studies also indicate that high dietary protein intake during the second trimester is associated with faster growth rates, while increased protein intake in the first trimester results in increased body fat.

“Farmers are paid per kilogram of beef produced. If you can lift weaning weights with relatively little increase in cost it means increased profits,” Dr Perry said.

Her study will determine the effects of dietary protein during pregnancy on the postnatal development of the calf and circulating hormone and growth factor levels known to affect foetal development.

The project is funded by Meat and Livestock Australia and the Australian Agricultural Company. Primix has supplied the protein meal.

The study will also consider the effects added protein intake during pregnancy might have on calving difficulties, as changes could increase calf birth weights.

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