title: The relationship between changes in serum glycine and alanine concentrations in non-essential amino acid and milk production in the transition period in dairy cows.
abstract: The serum concentration of non-essential amino acid (NEAA) was measured in ten Holstein dairy cows grouped as low production (n=5) and high production (n=5) from one month pre-partum through four months post-partum and the relationship between production and amino acid concentrations was studied. The glycine (Gly)/NEAA ratio and the glycine/alanine ratio of the high production group were significantly higher than the low production group (p<0.01). The observed decrease of the alanine (Ala)/NEAA ratio was more remarkable in the high production group than in the low production group. Measurement of Gly/Ala ratio in serum may be useful for evaluating the nutritional status of peri-parturient dairy cow.
authors.affiliation: Hata Veterinary Clinical Center, Hyogo Prefectural Federation of Agricultural Mutual Aid Associations, Kobe, Hyogo 651-1343, Japan.
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Shibano
authors.forename: Seiichi
authors.initials: S
authors.lastname: Kawamura
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Hakamada
authors.forename: Yozo
authors.initials: Y
authors.lastname: Kawamura
mesh_terms: D000409:Alanine / Q000097:blood*; D000596:Amino Acids / Q000097:blood*; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle / Q000097:blood / Q000502:physiology*; D003612:Dairying; D005260:Female; D005998:Glycine / Q000097:blood*; D007774:Lactation / Q000378:metabolism*; D011247:Pregnancy
chemical_list: D000596:Amino Acids; D000409:Alanine; D005998:Glycine