Milk metabolites as noninvasive indicators of nutritional status of mid-lactation Holstein and Montbéliarde cows - Archive ouverte HAL Access content directly
Proceedings Year : 2019

Milk metabolites as noninvasive indicators of nutritional status of mid-lactation Holstein and Montbéliarde cows

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Abstract

The objective was to investigate the effects of feed restriction on concentrations of selected milk metabolites in mid-lactation Holstein and Montbéliarde cows, and explore their correlations with energy balance. Nine Holstein and 10 Montbéliarde cows (165 ± 21 DIM) underwent 6 d of feed restriction during which feed allowance was reduced to meet 50% of NEL requirements calculated before initiation of the challenge. The experiment was divided in 4 periods: Control (CONT; d −3 to −1), restriction (REST; d 1 to 6), WK1 (d 7 to 13) and WK2 (d 18). Milk concentrations of β-hydroxybutyrate (BHB), glucose, glucose-6-phosphate (Glu6P), isocitrate and glutamate were measured and statistical analyses performed using mixed models of SAS with fixed effects of period and breed, and the random effect of cow. Relationships among variables were explored by Spearman correlations. Feed restriction induced a negative EB, increased Glu6P and isocitrate (+38% and +39%, respectively) and decreased BHB, glucose and glutamate concentrations in milk (−20%, −57% and −65%, respectively) compared with pre-challenge values (Table 1). All milk metabolites were significantly correlated with EB (0.46, 0.62, −0.25, −0.41, 0.59 for BHB, glucose, Glu6P, isocitrate and glutamate, respectively). Results suggest that milk metabolites may be used as noninvasive indicators of nutritional status of mid-lactation cows.
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Dates and versions

hal-02791592 , version 1 (05-06-2020)

Identifiers

  • HAL Id : hal-02791592 , version 1
  • PRODINRA : 475579

Cite

Pierre-Alexis Billa, Yannick Faulconnier, Torben Larsen, Christine Leroux, José Pires. Milk metabolites as noninvasive indicators of nutritional status of mid-lactation Holstein and Montbéliarde cows. American Dairy Science Association Annual Meeting, Jun 2019, Cincinnati, Ohio, United States. 102, suppl. 1, 2019, Journal of Dairy Science. ⟨hal-02791592⟩
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