PMID: 16538035Mar 16, 2006Paper

A new perspective on management of reproduction in dairy cows: the need for detailed metabolic information, an improved selection index and extended lactation

The Journal of Reproduction and Development
Hiroya Kadokawa, G B Martin

Abstract

For lactating dairy cows, we need management tools, that are "clean, green and ethical", cost-effective and easy to use. Specific tools are needed for artificial insemination (AI) after oestrus detection within a few months of calving, and for managing the complex nutritional requirements of cows between successive calvings. Assessment of energy deficit by measurement of body condition score (BCS) has been useful in the past but we now need more sophisticated ways to measure the relationship between adipose tissue and fertility. For this reason, we have focused our attention on the cells of the adipose tissue, the adipocytes, and the role of the hormone that they produce, leptin. This hormone affects pulsatile LH release and, in dairy cows, it seems to be linked to the first postpartum ovulation. Adipocytes are always sensing energy status and they control leptin secretion dynamically, so blood leptin concentrations can change acutely, even when there is no detectable change in BCS. Leptin secretion seems to be determined by the secretory activity of each adipocyte as well as the total mass of adipocytes in the body of the animal (as measured by BCS). The strong relationship between BCS, leptin concentration and reproductive fu...Continue Reading

References

Jun 14, 2000·Animal Reproduction Science·W R Butler
Sep 28, 2000·Journal of Reproduction and Fertility·D BlacheG B Martin
Feb 22, 2001·Animal Reproduction Science·S E SnijdersM P Boland
May 4, 2002·Animal Reproduction Science·V SilkeJ M Sreenan
Dec 9, 2003·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Alfonso AbizaidBarbara Woodside
Aug 11, 2004·Animal Reproduction Science·Ricardo C ChebelMichael Overton
Sep 18, 2004·Journal of Dairy Science·J R RocheM J VanBaale
Mar 2, 2005·Journal of Dairy Science·F MigliorB J Van Doormaal
May 21, 2005·Journal of Dairy Science·M del P SchneiderA Roth

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Citations

Aug 1, 2008·Animal : an International Journal of Animal Bioscience·M D RoyalN C Friggens
Mar 24, 2012·Animal : an International Journal of Animal Bioscience·A R G Wylie
Jun 7, 2007·The Journal of Veterinary Medical Science·Hiroya KadokawaHiroshi Yokota
Apr 15, 2014·Animal Reproduction Science·F SamadiM J D'Occhio

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