A study on ghrelin and LH secretion after short fasting and on ghrelin levels at perioestrual period in dairy cattle

Reproduction in Domestic Animals = Zuchthygiene
Thomas Markos ChouzourisGeorgios S Amiridis

Abstract

In two experiments, we studied (a) the changes of LH secretion in heifers under different feeding schedules and (b) total ghrelin concentration at oestrus in cows and heifers. In experiment one, synchronized heifers were allocated in three groups (R, regularly fed controls; F, fasted; and F-F fasted-fed). One day after the completion of the oestrous induction protocol, group F and F-F animals stayed without feed for 24 hr; thereafter, feed was provided to R and F-F cattle; 2 hr later, GnRH was administered to all animals. Blood samples were collected for ghrelin, progesterone, LH and cortisol concentrations. Fasting caused increased ghrelin concentrations in groups F and F-F, while in response to GnRH, LH surge was significantly attenuated in groups F and F-F compared to R. In experiment 2, lactating cows and heifers were used. On day 9 of a synchronized cycle, PGF2α was administered, and blood samples were collected twice daily until the third day after oestrus and analysed for progesterone, estradiol, ghrelin, glucose and BHBA concentrations. No difference was recorded between groups in steroids and BHBA concentrations. In comparison to mid-luteal values, ghrelin concentrations significantly increased at perioestrual period i...Continue Reading

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Citations

Sep 10, 2020·PloS One·Ana C Carranza MartinAlejandro Enrique Relling
Jul 28, 2020·Veterinary Sciences·Enrico Lippi OrtolaniAntonio Humberto Hamad Minervino

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