Dietary histidine has been shown to elevate circulating free histidine and plasma histamine concentration in murine models as much as six-fold. Bladder mastocytosis is a hallmark of feline interstitial cystitis, and histidine is stored in mast cells and converted to histamine for signaling and inflammation by the enzyme histidine decarboxylase. Elevated dietary histidine may represent a risk factor for heightened mast cell responses.
Nine healthy adult female shorthair cats were used to test the effects of dietary histidine (0.6%, 1.0% and 1.4% on a dry matter basis, or DM) on histamine in blood and urine. They ate dry, extruded test foods in sufficient amounts to maintain ideal body weight. Each experimental period was preceded by a seven-day period of feeding the 0.6% histidine diet, followed by a 14-day feeding period of the appropriate test food.
DM intake was not affected by treatment. Plasma histidine concentration increased with dietary supply of histidine. Urine output and titratable acidity of urine were similar across treatments. However, urine pH was lower in cats fed 1.4% histidine compared with 0.6% or 1.0%. Urinary histamine:creatinine was greater for the 1.4% histidine treatment compared to other diets, while urinary histamine concentration and plasma histamine concentration were unaffected. No differences among treatments in total histamine, cellular + noncellular or antigen-induced histamine release were detected in whole blood.
Increase in dietary histidine elevates circulating concentrations of histamine or antigen-induced histamine release in whole blood, but urinary histamine excretion may be responsive to dietary histidine supply.
Source: S.K. Martin et al., 2012. Influence of dietary histidine on basophil release, circulating concentration and urinary excretion of histamine in domestic felines. Intern J Appl Res Vet Med 10: 289-299.
This book takes a decidedly different turn from the usual consumer-oriented petfood fodder
The top 10 petfood manufacturers continue to feel the effects of the global economic meltdown
The maker of raw and holistic diets seeks to help transform pets through its products, philosophy, education and research
With the availability of quality ingredients declining, perhaps we need to explore this category
The lowly pea appears to be an effective ingredient for the next generation of dog and cat diets
What is this quiet, unassuming ingredient, and should it be there?
Canidae's Single Grain Protein Plus dog food line is designed to complement the company's existing lines, including its grain-free offerings and meat-based diets.
Explore the science behind extrusion technologies in the article, "Applying polymer science to extrusion and drying of petfoods"
Extrusion extravaganza 2010
Get even more online in our database of the latest equipment in all things extrusion, drying and cooling. Check out www.petfoodindustry.com/products.aspx and click "Equipment" or visit www.petfoodindustry.com/ExtrusionExtras.aspx for additional information on th
--- Thank you for your patience ----
If you have any issues logging in or any other need feel free to contact us.