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. An experiment,was,conducted,at the Grafton Agricultural Research,Station on the northern,coast of New South Wales whereby,low and high pasture nutritional systems,were imposed,on a herd of Hereford cows,during pregnancyandfrombirthtoweaninginafactorialdesign.Offspringrepresentingextremesofgrowthtobirthand/orweaning were then selected for study of long-term consequences,of growth,early in life. Implications of the nutritional treatments of cows,on subsequent,weaning,rates were also tested with data from previous studies. The extent to which,these extreme maternal nutritional and offspring growth,scenarios affected herd profitability was tested with the Beef-N-Omics decision support package. For the representative cattle enterprise modelled, gross margin per hectare ranged from $A114 to $A132. Inallcases,thegrossmarginforthosegroupswithfetalgrowthbasedonahigherlevelofnutritionexceededthatoftheirpeers on a lower level of nutrition. It is more profitable for cows and calves to have access to a high standard of nutrition during pregnancy,and up to weaning,than for them to have access only to a poor standard of nutrition. Incorporating differential weaning rates following maternal nutritional treatments reduced gross margins per hectare by up to 30%. On average, a 1% reduction in weaning,rate resulted in a 4.5% reduction in gross margin. Restricted cow–calf nutrition affects the future cow fertility, as well as the current calf progeny, economically. Additional keywords: Australia, beef, birthweight, economics, evaluation, fetal programming, nutrition.

Economic effects of nutritional constraints early in life of cattle