The effect of liveweight change on reproductive performance in a seasonally calving, pasture fed dairy herd

Alawneh, J. I., Stevenson, M. A., Williamson, N., Lopez-Villalobos, N. and Otley, T. (2012) The effect of liveweight change on reproductive performance in a seasonally calving, pasture fed dairy herd. Livestock Science, 145 1-3: 131-139. doi:10.1016/j.livsci.2011.12.025


Author Alawneh, J. I.
Stevenson, M. A.
Williamson, N.
Lopez-Villalobos, N.
Otley, T.
Title The effect of liveweight change on reproductive performance in a seasonally calving, pasture fed dairy herd
Journal name Livestock Science   Check publisher's open access policy
ISSN 0301-6226
1871-1413
Publication date 2012-05
Sub-type Article (original research)
DOI 10.1016/j.livsci.2011.12.025
Volume 145
Issue 1-3
Start page 131
End page 139
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
This was a prospective cohort study of 930 lactations in 595 mixed aged dairy cows that calved between 1 July and 24 October of 2008 and 1 July and 24 October 2009 in a single dairy herd in the lower North Island of New Zealand. Parametric accelerated failure time models based on the log-normal distribution were used to identify and quantify the effect of factors influencing the time it took for cows to conceive after the Planned Start of Mating (PSM) date. A focus of this study was to quantify the effect of liveweight change in the first 4 weeks after calving (ΔLWPP) and liveweight change in the period from PSM—21 days to PSM (ΔLWBPSM) on PSM to conception intervals.

Parity, calving to PSM interval, ΔLWBPSM, milk protein percentage, breed, clinical mastitis, the presence of a fertility treatment and season was associated with PSM to conception intervals. PSM to conception intervals for cows with zero or positive ΔLWBPSM was 74% of those for cows with negative ΔLWBPSM (TR 0.74, 95% CI 0.48 to 1.00; P = 0.05).

The findings of this study are consistent with those reported in the literature and better define the impact of long- and short-term liveweight changes on reproductive performance, providing the opportunity to design feeding programmes to minimise the impact of LW loss (used as a proxy for negative energy balance) on reproductive failure in pasture fed dairy herds.
Keyword Accelerated failure time
Reproduction
Daily liveweight
Automatic liveweight recording
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ
Additional Notes Available online 18 February 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Veterinary Science Publications
 
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Created: Thu, 12 Apr 2012, 21:41:44 EST by John Al-alawneh on behalf of School of Veterinary Science