Glutamate Supply Reactivates Ovarian Function while Increases Serum Insulin and Triiodothyronine Concentrations in Criollo x Saanen-Alpine Yearlings’ Goats during the Anestrous Season
2020
César A. Meza-Herrera | Hector P. Vergara-Hernández | Alicia Paleta-Ochoa | Alma R. Álvarez-Ruíz | Francisco G. Veliz-Deras | Gerardo Arellano-Rodriguez | Cesar A. Rosales-Nieto | Ulises Macias-Cruz | Rafael Rodriguez-Martinez | Evaristo Carrillo
The possible effect of glutamate supplementation upon ovarian reactivation and serum concentrations of insulin (INS) and triiodothyronine (T3) in anestrous yearling goats was evaluated. Goats (n = 32, 12 mo., 26°: North, 1117 m) with a similar live weight (LW) and body condition score (BCS) were blood sampled twice per week for two weeks (2 ×: 1 week ×: 2 weeks) to confirm the anestrus status (<:1 ng P4/mL: RIA). Thereafter, goats were randomly assigned to either 1) Glutamate (GLUT: n = 16, LW = 27.1 ±: 1.09 kg, 3.5 ±: 0.18 units, IV-supplemented with 7 mg of glutamate kg&minus:1 LW), or 2) Control (CONT: n = 16: LW = 29.2 ±: 1.09 kg: BCS = 3.5 ±: 0.18, IV saline). During the treatment period, 16 goats (eight/group) were blood sampled twice per week for six weeks. Such serum samples (2 ×: 1 week ×: 6 weeks) were quantified by their P4 content to evaluate the ovarian-luteal activity, whereas a sample subset (1 ×: 1 week ×: 6 weeks) was used to quantify their INS &: T3 content to evaluate their metabolic status. Neither LW (28.19 kg: p >: 0.05) nor BCS (3.51 units: p >: 0.05) differed between treatments. Goats depicting ovarian reactivation favored the GLUT group (50 vs. 12.5%: p <: 0.05). Neither INS (1.72 ±: 0.15 ng mL&minus:1) nor T3 (2.32 ±: 0.11 ng mL&minus:1) differed between treatments, yet a treatment x time interaction regarding INS &: T3 concentration across time favored (p <: 0.05) the GLUT group. The results unveil exogenous glutamate as an interesting modulator not only of ovarian reactivation, but of metabolic hormone synthesis.
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