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Prospects for zero days dry.

Robert J Collier¹, Ehrin L Annen, Allison C Fitzgerald

¹Department of Animal Sciences, University of Arizona, 1200 East South Campus Drive, P.O. Box 210038, Tucson, AZ 85721, USA. rcollier@ag.arizona.edu

The Veterinary Clinics of North America. Food Animal Practice

|October 9, 2004

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Dairy cow parity and management impact dry period needs. Continuous milking in multiparous cows prevented production loss, unlike in first-lactation heifers.

Area of Science:

Dairy Science
Animal Nutrition
Reproductive Management

Background:

Dry period length significantly influences dairy cow productivity and health.
Parity and management practices are key factors affecting dry period requirements.
Previous research indicates varying responses to interventions like bST and IMF based on cow age.

Purpose of the Study:

To investigate the impact of parity and management on dry period requirements in high-producing dairy cows.
To evaluate the efficacy of interventions such as bST (bovine somatotropin) and IMF (insulin-like growth factor) in mitigating production losses.
To explore the potential benefits of continuous milking and different dry period lengths (LDPP - long dry period, SDPP - short dry period) in conjunction with bST and IMF.

Main Methods:

Related Experiment Videos

Comparison of milk yield and production losses in multiparous cows versus first-lactation heifers.
Assessment of the effects of bST and IMF treatments on subsequent lactation performance.
Analysis of feed intake and metabolic health indicators during the peripartum period in continuously milked cows.

Main Results:

Multiparous cows continuously milked and treated with bST showed negligible production losses in the subsequent lactation.
First-lactation heifers experienced significant milk yield reductions, which were not ameliorated by bST or IMF.
Continuous milking was associated with higher peripartum feed intake, potentially improving metabolic health.

Conclusions:

Dry period requirements are highly dependent on parity and management strategies.
Continuous milking may offer metabolic and production benefits, particularly for multiparous dairy cows.
Further research is needed to fully understand the long-term health implications of continuous milking and its interaction with dry period management.