Threonine imbalance, deficiency and neurologic dysfunction in the kitten

Area of Science:

• Animal Nutrition
• Biochemistry
• Veterinary Medicine

Background:

• Threonine is an essential amino acid crucial for protein synthesis and overall health in growing animals.
• Dietary imbalances or deficiencies in essential amino acids can lead to significant physiological and clinical consequences.

Purpose of the Study:

• To investigate the effects of threonine-imbalanced and threonine-deficient purified diets on food intake, weight gain, and plasma amino acid profiles in growing kittens.
• To determine if kittens adapt to threonine-deficient diets over time and to observe the clinical signs associated with threonine imbalance.

Main Methods:

• Growing kittens were fed purified diets containing L-amino acids as the sole nitrogen source.
• An imbalanced diet was created by supplementing a basal diet with an amino acid mixture lacking threonine.
• Food intake, weight gain, plasma amino acid concentrations, and clinical signs were monitored.

Main Results:

• Feeding threonine-imbalanced diets significantly depressed food intake and weight gain in kittens.
• Neurologic dysfunction and lameness were observed in kittens fed threonine-imbalanced or deficient diets.
• Plasma threonine levels remained depressed across basal, imbalanced, and corrected diets, only normalizing with a standard diet.

Conclusions:

• Threonine deficiency or imbalance in purified diets negatively impacts growth and causes neurological symptoms in kittens.
• Kittens do not show adaptation to threonine-imbalanced diets in terms of food intake or weight gain.
• Correcting the threonine imbalance resolved clinical signs, emphasizing the critical role of adequate threonine supply.