ISSN 2756-3871
International Journal of Veterinary Medicine and Animal Health Vol. 9 (4), pp. 001-006, April, 2018. © International Scholars Journals
Full Length Research Paper
Effect of the periparturient period on blood free amino acid concentration in dairy cows/healthy cows
Yousuke Maeda, Hiromichi Ohtsuka and Masa-aki Oikawa*
Large Animal Medical Center, School of Veterinary Medicine, Kitasato University, 35-1 Higashi 23 Ban-cho, Towada, Aomori 034-8628, Japan.
Accepted 16 September, 2017
Abstract
A negative energy balance (NEB) attributed to sugar and lipid metabolic disorders are common in periparturient cows. The relationship between periparturient disorders and amino acid metabolism is unclear. The present study was aimed to observe the kinetics of blood free amino acids healthy periparturient cows simultaneously with the concentrations of biochemical constituents in plasma. The changes in the concentrations of plasma biochemical constituents and blood free amino acids were monitored in healthy periparturient cows. There were three types of amino acid; a group of amino acids (Val, Leu, Ile, Trp, Thr, Arg, Lys, Tyr, Ala, Pro, Asn, Orn) whose blood concentrations decreased because their consumption is accelerated under periparturient energy-shortage state, a group of AAs (Gly, Ser) whose concentrations increased because they are mobilized to compensate for periparturient energy shortage, and a group of amino acids (Glu, Gln) that are taken into the mammary gland tissues and mobilized from the start of lactation after delivery. The blood free amino acid concentrations in periparturient cows indicated the various kinetics of amino acid concentration corresponding to changes in energy generation. Analysis of amino acid metabolism should be entertained in the pathogenesis of NEB-related periparturient disorders.
Key words: Cow, serum free amino acid concentration, periparturient, metabolism of amino acid.