I gleaned the following information from an article someone sent me today. Makes you wonder if it is "sound science" or clever marketing.
"New research published in the June 04 issue of the Canadian Journal of Animal Science evaluated several populations of cattle having either Leptin-T or Leptin-C and looked at feed intake, feed efficiency, growth, feeding behavior, carcase quality and body composition in these cattle populations. There was no statistical difference between the populations for growth, feed intake and feed efficiency. Steers carrying Leptin-T had higher carcase backfat, lower yield grade and lower lean meat yield. They also tended to have higher loin subcutaneous fat, brisket fat and body cavity fat. Importantly, no association was found in carcase marbling or rib eye area. The conclusion of the researchers was that animals carrying Leptin-T versus Leptin-C may produce carcases with poorer yield grades and lower lean meat yields but do not differ in carcase marbling."
"New research published in the June 04 issue of the Canadian Journal of Animal Science evaluated several populations of cattle having either Leptin-T or Leptin-C and looked at feed intake, feed efficiency, growth, feeding behavior, carcase quality and body composition in these cattle populations. There was no statistical difference between the populations for growth, feed intake and feed efficiency. Steers carrying Leptin-T had higher carcase backfat, lower yield grade and lower lean meat yield. They also tended to have higher loin subcutaneous fat, brisket fat and body cavity fat. Importantly, no association was found in carcase marbling or rib eye area. The conclusion of the researchers was that animals carrying Leptin-T versus Leptin-C may produce carcases with poorer yield grades and lower lean meat yields but do not differ in carcase marbling."
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