Garcia-Roche 2023 PLoS One

García-Roche M, Talmón D, Cañibe G, Astessiano AL, Mendoza A, Cassina A, Quijano C, Carriquiry M (2023) Hepatic metabolism of grazing cows of two Holstein strains under two feeding strategies with different levels of pasture inclusion. https://doi.org/10.1371/journal.pone.0290551

» PLoS One 18:e0290551. PMID: 37883506 Open Access

Garcia-Roche Mercedes, Talmon Daniel, Canibe Guillermo, Astessiano Ana Laura, Mendoza Alejandro, Cassina Adriana, Quijano Celia, Carriquiry Mariana (2023) PLoS One

Abstract: The objective of the study was to characterize adaptations of hepatic metabolism of dairy cows of two Holstein strains with varying proportions of grazing in the feeding strategy. Multiparous autumn calving Holstein cows of New Zealand (NZH) and North American (NAH) strains were assigned to a randomized complete block design with a 2 x 2 factorial arrangement with two feeding strategies that varied in the proportions of pasture and supplementation: maximum pasture and supplementation with a pelleted concentrate (MaxP) or fixed pasture and supplementation with a total mixed ration (FixP) from May through November of 2018. Hepatic biopsies were taken at - 45 ± 17, 21 ± 7, 100 ± 23 and 180 ± 23 days in milk (DIM), representing prepartum, early lactation, early mid-lactation and late mid-lactation. The effects of DIM, feeding strategy (FS), strain and their interactions were analyzed with mixed models using repeated measures. Cows of both strains had similar triglyceride levels, mitochondrial function and carnitine palmitoyltransferase activity in liver during lactation. However, there was an effect of DIM and FS as liver triglyceride was higher for the MaxP strategy at 21 DIM and both mitochondrial function and carnitine palmitoyltransferase activity in liver were lower for the MaxP strategy at 21 DIM. Hepatic mitochondrial function and acetylation levels were affected by the interaction between strain and feeding strategy as both variables were higher for NAH cows in the MaxP strategy. Mid-lactation hepatic gene expression of enzymes related to fatty acid metabolism and nuclear receptors was higher for NZH than NAH cows. This work confirms the association between liver triglyceride, decreased hepatic mitochondrial function and greater mitochondrial acetylation levels in cows with a higher inclusion of pasture and suggests differential adaptative mechanisms between NAH and NZH cows to strategies with varying proportions of grazing in the feeding strategy.

• Bioblast editor: Plangger M • O2k-Network Lab: UY Montevideo Radi R

Labels: MiParea: Respiration, Exercise physiology;nutrition;life style 

Organism: Bovines  Tissue;cell: Liver  Preparation: Intact cells 

Coupling state: LEAK, OXPHOS, ET  Pathway: F, N, S, NS, ROX  HRR: Oxygraph-2k 

2023-11