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Sheep and goats differences in CLA and fatty acids milk fat content in relation with mRNA stearoyl-CoA desaturase and lipogenic genes expression in their mammary gland

Published online by Cambridge University Press:  29 July 2009

Eleni Tsiplakou ,
Emmanouil Flemetakis ,
Chrysanthi Kalloniati ,
George Papadomichelakis ,
Panagiotis Katinakis  and
George Zervas
Eleni Tsiplakou*
Affiliation:
Department of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Emmanouil Flemetakis
Affiliation:
Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Chrysanthi Kalloniati
Affiliation:
Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
George Papadomichelakis
Affiliation:
Department of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
Panagiotis Katinakis
Affiliation:
Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
George Zervas
Affiliation:
Department of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855, Athens, Greece
*
*For correspondence; e-mail: eltsiplakou@aua.gr
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Abstract

An experiment was conducted with 12 lactating dairy ewes and 12 goats with the objective to determine whether, under the same dietary treatments, the differences in their fatty acid (FA) profile with emphasis on cis-9 trans-11 CLA milk fat content, are reflected in the transcript levels of genes involved in FA and cis-9, trans-11 CLA biosynthesis. The animals were fed with two diets (A, B) in different days of milk (DIM) due to the different milk yield, body weight etc, in order to have the same food intake and to avoid dietary effects. Diet A was fed to the animals on a group basis as it is traditionally used in practice, while diet B was chosen to avoid individual feed intake variation which is usually observed in group feeding. The results showed that there are significantly lower mRNA levels of acetyl-CoA carboxylase (ACC) in sheep mammary gland compared with those of goats, independently from the diet fed. The same trend was observed with the mRNA level of FA synthase (FAS), but the results were significant only for diet A. The mRNA level of lipoprotein lipase (LPL) in the mammary gland did not differ between sheep and goats fed with diet A. In addition, the concentration of cis-9 trans-11 CLA content was significantly higher in sheep milk fat compared with those of goats. This is in accordance with the significant higher levels on mRNA of stearoyl-CoA desaturase (SCD) which were observed in their mammary adipocytes of sheep compared with those of goats, independently of the fed diet (A or B). In conclusion, these findings demonstrate that the differences between sheep and goats, concerning cis-9, trans-11 CLA and FA milk fat content, under the same dietary treatments could be explained in part by the differences in mRNA of SCD and lipogenic genes in their mammary gland.

Keywords

Animal speciesLipogenic genesΔ-9-desaturaseConjugated linoleic acid
Type
Research Article
Information
Journal of Dairy Research , Volume 76 , Issue 4 , November 2009 , pp. 392 - 401
Copyright
Copyright © Proprietors of Journal of Dairy Research 2009

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