A gene which increases the weight of prime cuts by 19% and overall beef yield by 7% has been discovered by researchers at Adelaide University in Australia. The gene, a modification of the myostatin gene called F94L, is shown to occur with high frequency in Limousin cattle but with very low frequencies in other breeds.
Adelaide University team leader, Dr. Wayne Pitchford, said the research showed exciting results with the gene increasing the amount of prime cuts in the carcase by as much as 19 percent.
"Animals with two copies of the gene consume the same amount of feed as animals with no copies of the gene so they are much more efficient at producing beef." he said.
Dr Pitchford said the gene also increases tenderness. "Using the laboratory shear force test, meat from animals with two copies of the gene required 11 percent less force to cut a sample of the eye round muscle compared to animals with no copies of the gene.
"The amount of force required to cut the loin muscle from animals with two copies of the gene was six percent less than the force to cut the loin muscle from animals with no copies of the gene.
"The F94L gene also causes a 20 percent reduction in intramuscular fat and a 30 percent reduction in external fat cover resulting in healthier beef and higher yields of retail beef from each carcase," Dr Pitchford said.
The testing has revealed that the frequency of the gene in purebred Limousins is 98.3 percent which means that almost all purebred Limousins carry two copies of the gene.
Of 15 other breeds tested in the research, conducted on a sample base of 1081 unrelated cattle, the F94L gene was only found in very low frequencies. The next highest frequency recorded in a breed was 3%. Dr Diane Vankan of the University of Queensland, who presented these findings at the International Society of Animal Genetics (ISAG) Conference held in Holland in May this year, concluded that: “F94L is found almost exclusively in the Limousin breed.”
The research also notes that the F94L gene is not the same modification of the myostatin gene which causes double muscling in breeds such as the Belgian Blue. The Adelaide University research showed that the F94L variation of the myostatin gene does not have any deleterious effects on birth weight or calving difficulty.
Some Limousin bulls on Semenstore have been tested for the F94L "Profit" gene. As with all genes, bulls may have zero, one or two copies of the gene. Search the F94L Tested sidebar to find bulls which have been tested and/or where the results are known.