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Milk progesterone as a tool to improve fertility in dairy cows

Petersson, Karl-Johan (2007). Milk progesterone as a tool to improve fertility in dairy cows. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:46
ISBN 978-91-576-7345-9
[Doctoral thesis]

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Milk progesterone offers an opportunity to objectively study fertility in dairy cows, in contrast to traditional measures of dairy cow fertility, which in general are highly influenced by on-farm management decisions. The aim of this thesis was to study how milk progesterone could be used as a genetic and management tool to improve fertility in dairy cows. Progesterone-based measures were influenced by different systematic factors, e.g. breed, parity, season, housing and lameness, studied in a dataset from a Swedish experimental herd. The repeatabilities were higher for progesterone-based measures compared with traditional measures of fertility based on insemination data. If a cow had an atypical progesterone profile in one lactation, the risk of an atypical profile in the next lactation was increased. Genetic parameters for progesterone measures based on different milk sampling intervals were estimated in a British dataset. Heritability estimates were moderate, but decreased with increased sampling intervals. It was shown that progesterone analysis of monthly milk samples, resembling milk sampling as in the current Swedish milk recording system, could be used to increase the accuracy of genetic evaluation for an earlier start of cyclical ovarian activity after calving. Inclusion of monthly milk sampling for progesterone analysis in predictive models could also be used to identify cows with delayed ovarian cyclicity with a high accuracy already two months after calving. This enables an earlier treatment of ovarian dysfunction and therefore, probably, a shorter calving interval. In conclusion, this thesis shows that milk progesterone may be used for improved management and genetic evaluation of dairy cow fertility.

Authors/Creators:Petersson, Karl-Johan
Title:Milk progesterone as a tool to improve fertility in dairy cows
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :May 2007
Number of Pages:35
ALLI. Petersson, K.-J., Strandberg, E., Gustafsson, H. & Berglund, B. 2006. Environmental effects on progesterone profile measures of dairy cow fertility. Animal Reproduction Science 91, 201-214. II. Petersson, K.-J., Gustafsson, H., Strandberg, E. & Berglund B. 2006. Atypical progesterone profiles and fertility in Swedish dairy cows. Journal of Dairy Science 89, 2529-2538. III. Petersson, K.-J., Berglund, B., Strandberg, E., Gustafsson, H., Flint, A.P.F., Woolliams, J.A. & Royal, M.D. 2007. Genetic analysis of postpartum measures of luteal activity in dairy cows. Journal of Dairy Science 90, 427-434. IV. Petersson, K.-J., Strandberg, E., Gustafsson, H., Royal, M.D. & Berglund, B. 2007. Detection of delayed cyclicity in dairy cows based on progesterone content in milk sampled at different intervals. (Submitted).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7345-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:dairy cattle, cows, cow milk, progesterone, fertility, oestrous cycle, reproductive performance, lactation, genetic parameters, sampling, analytical methods
Keywords:dairy cow, fertility, genetic evaluation, luteal activity, management, progesterone profile
Permanent URL:
ID Code:1433
Department:(VH) > Dept. of Animal Breeding and Genetics
Deposited By: Karl-Johan Petersson
Deposited On:03 May 2007 00:00
Metadata Last Modified:02 Dec 2014 10:12

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