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Effects of dry period length on follicular dynamics in early lactating Holstein cows

Published online by Cambridge University Press:  22 November 2017

A Soleimani ,
A Heravi Moussavi ,
M Danesh Mesgaran  and
S Safa
A Soleimani
Affiliation:
Islamic Azad University-Kashmar Branch, Kashmar, Khorasan Razavi, Islamic Republic of Iran Dept of Animal Science, Ferdowsi University of Mashhad, Mashhad, Khorasan Razavi, Islamic Republic of Iran
A Heravi Moussavi*
Affiliation:
Dept of Animal Science, Ferdowsi University of Mashhad, Mashhad, Khorasan Razavi, Islamic Republic of Iran
M Danesh Mesgaran
Affiliation:
Dept of Animal Science, Ferdowsi University of Mashhad, Mashhad, Khorasan Razavi, Islamic Republic of Iran
S Safa
Affiliation:
Dept of Animal Science, Ferdowsi University of Mashhad, Mashhad, Khorasan Razavi, Islamic Republic of Iran
*
Email: [email protected]
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Extract

For profitable production of milk, a nonlactating or dry period is established between lactations of dairy cow. There has been substantial recent interest in shortening dry periods. Physiological studies show that the changes the udder goes through to prepare for the next lactation take about three weeks, and yet current advice is that the most appropriate dry period for a modern dairy cow is 45 to 60 days. More recent studies show good reason to question that advice, and suggest dry periods of 30 to 35 days have no detrimental effect on production, but information relating the effects of dry period to subsequent reproductive performance of lactating cows is sparse (Grummer, 2007). Also, the effect of this management change on follicular dynamic has not been adequately evaluated. Therefore, the objective of the present study was to determine the effects of dry period length on follicular dynamics in early lactating Holstein cows.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2009 , April 2009 , pp. 134
Copyright
Copyright © The British Society of Animal Science 2009

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References

Grummer, R.R. 2007. Strategies to improve fertility of high yielding dairy farms: Management of the dry period. Theriogenology. 68S. S281–S288 Google Scholar
Gumen, A, Rastani, R. R., Grummer, R. R., and Wiltbank, M. C. 2005. Reduced Dry Periods and Varying Prepartum Diets Alter Postpartum Ovulation and Reproductive Measures. J. Dairy Sci. 88, 2401–2411 Google Scholar
Heravi Moussavi, A., Gilbert, R.O.., Overton, T.R.., Boauman, D.E.., Butler, W.R. (2007). Effect of feeding fish meal and n-3fatty acid on ovarian uterin responses in early lactating dairy cows. J.Dairy Sci. 90, 136–144 Google Scholar