Forage preservation (grazing vs. hay) fed to ewes affects the fatty acid profile of milk and CPT1B gene expression in the sheep mammary gland
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Date
2012
Authors
Dervishi, EldaJoy Torrens, Margalida
Sanz Pascua, Albina
Alvarez Rodríguez, Javier
Molino Gahete, Francisco
Calvo Lacosta, Jorge Hugo
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Background: Alterations in lipid metabolism occur when animals are exposed to different feeding systems. In the
last few decades, the characterisation of genes involved in fat metabolism and technological advances have
enabled the study of the effect of diet on the milk fatty acid (FA) profile in the mammary gland and aided in the
elucidation of the mechanisms of the response to diet. The aim of this study was to evaluate the effect of different
forage diets (grazing vs. hay) near the time of ewe parturition on the relationship between the fatty acid profile and
gene expression in the mammary gland of the Churra Tensina sheep breed.
Results: In this study, the forage type affected the C18:2 cis-9 trans-11 (CLA) and long-chain saturated fatty acid
(LCFA) content, with higher percentages during grazing than during hay feeding. This may suggest that these FAs
act as regulatory factors for the transcriptional control of the carnitine palmitoyltransferase 1B (CPT1B) gene, which
was more highly expressed in the grazing group (GRE). The most highly expressed gene in the mammary gland at
the fifth week of lactation is CAAT/ enhancer- binding protein beta (CEBPB), possibly due to its role in milk fat
synthesis in the mammary gland. More stable housekeeping genes in the ovine mammary gland that would be
appropriate for use in gene expression studies were ribosomal protein L19 (RPL19) and glyceraldehyde- 3- phosphate
dehydrogenase (GAPDH).
Conclusions: Small changes in diet, such as the forage preservation (grazing vs. hay), can affect the milk fatty acid
profile and the expression of the CPT1B gene, which is associated with the oxidation of fatty acids. When compared
to hay fed indoors, grazing fresh low mountain pastures stimulates the milk content of CLA and LCFA via mammary
uptake. In this sense, LCFA in milk may be acting as a regulatory factor for transcriptional control of the CPT1B
gene, which was more highly expressed in the grazing group.
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Bibliographic citation
Elda Dervishi, Margarita Joy, Albina Sanz, Javier Alvarez-Rodriguez, Francisco Molino and Jorge H Calvo. “Forage preservation (grazing vs. hay) fed to ewes affects the fatty acid profile of milk and CPT1B gene expression in the sheep mammary gland”. BMC Veterinary Research 2012, 19 P., 8:106 doi:10.1186/1746-6148-8-106
Other field subjects
OvinosÁcidos grasos
Forrajes
Dieta
Leche de oveja
Churra tensina
Churro
Producción y sanidad animal