Consequences of extending the voluntary waiting period for insemination on reproductive performance in dairy cows

The aim of the study was to evaluate the effect of extended voluntary waiting period (VWP) on ovarian cyclicity and reproductive performance of dairy cows. Holstein-Friesian dairy cows (N = 154) were blocked and randomly assigned to one of 3 groups with different VWP (50, 125 or 200 d: VWP-50, VWP-1...

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Bibliographic Details
Published in:Animal reproduction science 2022-09, Vol.244, p.107046, Article 107046
Main Authors: Ma, Junnan, Burgers, Eline E.A., Kok, Akke, Goselink, Roselinde M.A., Lam, Theo J.G.M., Kemp, Bas, van Knegsel, Ariette T.M.
Format: Article
Language:English
Subjects:
Dairy cows
Extended lactation
Fertility
Milk production
Ovarian cyclicity
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Summary:The aim of the study was to evaluate the effect of extended voluntary waiting period (VWP) on ovarian cyclicity and reproductive performance of dairy cows. Holstein-Friesian dairy cows (N = 154) were blocked and randomly assigned to one of 3 groups with different VWP (50, 125 or 200 d: VWP-50, VWP-125 or VWP-200). Milk samples were collected 3 times a week and analysed for progesterone concentration. Ovarian cycles were classified as: normal (18–24 days), short (24 days). For cows that became pregnant within 100 days after VWP, a VWP-200 d was related with fewer days until pregnancy after end of the VWP (19.4 d) compared with VWP-50 or VWP-125 (35.5, 37.3 d respectively). During 100 days (−50 until 50 d) around the end of VWP, cows in VWP-200 had a greater percentage of normal cycles (91.9 vs 58.0 %, P 
ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2022.107046