Yann faucon biography of alberta
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Abstract
Cows exposed to short day photoperiod (SD, 8L:16D) during the 60-day nonlactating period prior to parturition produce more milk in their subsequent lactation compared with cows exposed to long day photoperiod (LD, 16L:8D). Although this response is well established in dairy cows, the underlying mechanisms are not understood. We hypothesized that differential gene expression in cows exposed to SD or LD photoperiods during the dry period could be used to identify the functional basis for the subsequent increase in milk production during lactation. Pregnant, multiparous cows were maintained on an SD or LD photoperiod for 60 days prior to parturition. Mammary biopsies were obtained on days −24 and −9 relative to parturition and Affymetrix GeneChip Bovine Genome Arrays were used to quantify gene expression. Sixty-four genes were differentially expressed (P ≤ 0.05 and fold-change ≥ |1.5|) between SD and LD treatments. Many of these genes were associated with cell growth and proliferation, or immune function. Ingenuity Pathway Analysis predicted upstream regulators to include TNF, TGF-β1, interferon-γ, and several interleukins. In addition, expression of 125 genes was significantly different between day −24 and day −9; those genes were associated with milk compone
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ANNEX 1
BIBLIOGRAPHY
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The Mite Family Chaetodactylidae
Composition of Chaetodactylidae
Catalogue of Chaetodactylidae
Distribution of Chaetodactylidae
Hosts of Chaetodactylidae
Bibliography of Chaetodactylidae
The Mite Family Hyadesiidae
Composition of Hyadesiidae
Catalogue of Hyadesiidae
Distribution of Hyadesiidae
Bibliography of Hyadesiidae
The Mite Family Algophagidae Fain
Composition of Algophagidae
Catalogue of Algophagidae
Distribution of Algophagidae
Hosts of Algophagidae
Bibliography of Algophagidae
The Mite Family Hemisarcoptidae
Composition of Hemisarcoptidae
Catalogue of Hemisarcoptidae
Distribution of Hemisarcoptidae
Hosts of Hemisarcoptidae
Bibliography of Hemisarcoptidae
The Mite Family Carpoglyphidae
Composition of Carpoglyphidae
Catalogue of Carpoglyphidae
Distribution of Carpoglyphidae
Hosts of Carpoglyphidae
Bibliography of Carpoglyphidae
The Mite Family Winterschmidtiidae (Saproglyphidae)
Composition of Winterschmidtiidae
Catalogue of Winterschmidtiidae
Distribution of Winterschmidtiidae
Hosts of Winterschmidtiidae
Bibliography of Winterschmidtiidae