David Carreño

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Several studies in dairy cows have shown a relationship between milk fat depression (MFD) and alterations caused in lipogenic gene expression by dietary nutrients. However, information on small ruminants is not only scarce but also inconsistent. Therefore, this experiment was conducted in dairy ewes to study the effect of a diet known to induce MFD on milk(More)
The use of stable isotopes is a reliable and risk-free alternative to radioactive tracers for directly examining in vivo fatty acid (FA) metabolism. However, very limited information is available in ruminants, and none is available in sheep. Therefore, we conducted an experiment in dairy ewes to determine, for the first time in this species, the uptake,(More)
......................................... Received: 16-11-13 Accepted: 08-05-14 Abstract When it was introduced 40 years ago, endoscopic retrograde cholangiopancreatography (ERCP) was used to diagnose biliopancreatic diseases. Nevertheless, because of its risks, it has been used only for therapeutic procedures for more than 10 years. It is very useful for(More)
The modulation of milk fat nutritional quality through fish oil supplementation seems to be largely explained by the action of n-3 very long chain polyunsaturated fatty acids (PUFA) on ruminal biohydrogenation (BH) of C18 fatty acids (FA). However, relationships among this action, disappearance of those PUFA in the rumen, and potential detrimental(More)
1 Gastroenterology Unit at the Universidad Nacional de Colombia and Gastroenterologist at Hospital El Tunal in Bogotá, Colombia 2 Hospital El Tunal in Bogotá, Colombia 3 Surgeon at the Universidad Nacional de Colombia in Bogotá, Colombia ......................................... Received: 16-11-13 Accepted: 08-05-14 Abstract Boerhaave’s syndrome is a type(More)
Supplementation of dairy ewe diet with marine lipids may be an effective strategy for modulating milk fatty acid composition but induces milk fat depression (MFD). This syndrome has been associated with a shortage of 18:0 for uptake and Δ(9)-desaturation that may impair the capacity of the mammary gland to achieve an adequate fluidity for milk fat(More)
Milk fat depression (MFD) caused by trans-10,cis-12 18:2 is known to be mediated in cows and ewes by downregulation of mammary lipogenic genes. However, transcriptional mechanisms underlying marine lipid-induced MFD have not been well defined yet and the few available studies in ovine are not consistent. This trial was conducted to directly compare changes(More)
We previously reported 2 experiments with rumen-cannulated Holstein-Friesian dairy cows showing that during the transition period, rumen papillae surface area, and fractional absorption rate of volatile fatty acids (VFA) increase after calving. However, supplemental concentrate during the dry period and rate of increase of concentrate allowance during(More)
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