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Originally Posted by Lunas Mom
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I recently went to a nutrition seminar focused on bitches in whelp and developing puppies and there is strong evidence that tyrosine supplementation makes for easier breeding and larger, healthier litters. I have found that true in my own experience after having used Royal Canin's "HT42D" formula with my own GSD bitch. The tyrosine link was first discovered in Germany's "Auman study" and RC went ahead and developed a special food for bitches from their 1st day of heat to the 42nd.
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Interesting though not surprising. Tyrosine is found in high doses in many meats, eggs, and soy items. In a 200 calorie serving of raw egg white, there's over 1900mg of tyrosine. Many fowl (turkey, chicken, quail) in identity portions contain nearly as much. So in a species appropriate meat heavy diet, tyrosine shouldn't be in any short supply.. in fact if 500mg extra is the goal, it would be as simple as adding an extra egg or a few spoonfuls of cottage cheese to their daily food. Cool.