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Soy Best...Now it’s Rumen-Protected with Lecithin
Rumen Profiling Laboratory, West Virginia University. January, 2004
The rumen-protected nature of lecithin is well known.1,2,4,5,7 Now lecithin is an important component of Soy Best. Its level is controlled by a proprietary manufacturing process. A primary component of lecithin is phosphatidyl-choline. This phospholipid plays a key role in methyl group metabolism and has an important methionine-sparing effect in dairy cattle.
This trial was designed to measure the rumen-bypass value of the protein, amino acids and phosphatidyl-choline in Soy Best which was manufactured by the new process. A sample of Soy Best was incubated in the rumen of a fistulated Holstein cow for 16 hours. The cow was in early lactation and producing 80 pounds of milk daily. Samples were run in triplicate.
Phosphatidyl-Choline Bypass, %
More Bypass Protein
Application of lecithin to Soy Best is a new process. Prior to the development of this process, Soy Best protein had a measured rumen-bypass value of 60%. Now, with the advantage of lecithin and its rumen-protected nature, the bypass value has been measured at 73%.
More Bypass Methionine, Lysine, Histidine and Threonine
The rumen-bypass rates of methionine, lysine, histidine and threonine have been measured at the Rumen Profiling Laboratory, West Virginia University. Their rates are consistent with the increased protein bypass rate associated with the addition of lecithin in the new manufacturing process.
What’s Phosphatidyl-Choline Worth?
Commercial methionine supplements can retail for 12¢/12 grams/cow/day. Assuming the supplement is 65% methionine and 90% of that is rumen-bypass, the cost of metabolizable methionine is 1.7¢/gram.
* Soy Best contains 0.61% phosphatidyl-choline which is 30% rumen-bypass.
Relative to the methionine supplement mentioned above, the 1 gram of metabolizable methionine spared by the phosphatidyl-choline in Soy Best is worth 1.7¢, or $17 of added value per ton of Soy Best. This is over and above the value that Soy Best brings to dairy rations as a palatable source of intestinally digestible bypass protein.
Phosphatidyl-choline is the secret weapon in Soy Best.
The mobilization of triglycerides from a cow’s liver for the purpose of producing
When the supply of phosphatidyl-choline is inadequate to meet demand, the cow
The lecithin (phosphatidyl-choline) in Soy Best has important benefits for the dairy cow.
1. Abel-Caines, et al., 1998. J. Dairy Sci., 81:462
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