Sandagdorj B, Baigalmaa T, Burenjargal S, Horiuchi M, Enkhdalai M, Bayanbat D, Janchiv D, Jamyandorj O, Ulzii-Orshikh P, Nyam-Osor P. Relationship between lactational performance and metabolic parameters of Mongolian native grazing mares.
J Equine Sci 2021;
32:91-98. [PMID:
34539210 PMCID:
PMC8437754 DOI:
10.1294/jes.32.91]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 07/02/2021] [Indexed: 11/30/2022] Open
Abstract
Information regarding the lactational performance of mares in relation to metabolic
parameters can help practitioners to manipulate animal rearing management for sustainable
mare milk production. The aim of this study was to characterize the lactational
performance of Mongolian native mares grazing on natural pastureland by revealing the
seasonal effects on metabolic parameters. In this study, 8 multiparous mares were used.
Milk yield and composition and serum metabolic parameters, such as alanine
aminotransferase, aspartate aminotransferase (AST), glucose (GLU), triacylglycerol, total
cholesterol (TCH), non-esterified fatty acid (NEFA), albumin, urea, total protein,
cortisol (Cort), and insulin, were determined at 30, 60, 90, 120, 150, 180, 210, 240, and
270 days of lactation. During the lactation period, milk yield peaked at around the 90th
day and declined sharply in the following period. While the milk fat and protein contents
decreased gradually from the early stages of lactation to the late stages, the lactose
content was highest at mid-lactation and stayed constant until the end of the lactation
period. Meanwhile, changes were observed between the stages of lactation, and the
differences in metabolic parameters were significant (P<0.05), except for AST and GLU.
The strongest correlation was found with NEFA (P<0.01), followed by the Cort
(P<0.05) concentration, with both parameters showing negative correlation, and strong
positive correlation was detected between the milk yield and TCH (P<0.05)
concentration.
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