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Food, fibre and pharmaceuticals from animals
PERSPECTIVES ON ANIMAL BIOSCIENCES (Open Access)

Importance of circadian rhythms in dairy nutrition

Kevin J. Harvatine https://orcid.org/0000-0001-6422-2647 A *
+ Author Affiliations
- Author Affiliations

A Department of Animal Science, Penn State University, University Park, PA, USA.

* Correspondence to: kjh182@psu.edu

Handling Editor: David Masters

Animal Production Science 63(18) 1827-1836 https://doi.org/10.1071/AN23085
Submitted: 28 February 2023  Accepted: 26 June 2023  Published: 18 July 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Biological rhythms are repeating patterns that are driven by time-keeping mechanisms within the animal and are adaptive as they coordinate physiology and metabolism with the external environment. The dairy cow has a well recognised natural daily pattern of feed intake and milk synthesis, but regulation of these rhythms has not been well described in the literature or well considered in current dairy management. Recent discoveries have clearly described circadian time-keeping mechanisms in peripheral tissues that are responsive to the timing of food availability. Some management strategies on dairy farms may desynchronise the interactions between central and mammary circadian timekeepers, resulting in reduced milk yield and efficiency. Feeding a total mixed ration is commonly assumed to create constant ruminal conditions, but the large variation in the rate of feed intake across the day causes large fluctuations in rumen fermentation and absorbed nutrients. Milk composition also differs across the day due to both dynamics in nutrient absorption and biological regulation attempting to match milk yield and composition with calf requirements across the day. Recent work has shown that milk synthesis varies over the day and is modified by the timing of feed intake and nutrient absorption. These rhythms have also been shown to be affected by the timing of feed delivery. We expect that maximal milk yield and efficiency are achieved when we have more consistent rumen fermentation and match the timing of nutrient absorption and mammary capacity for milk synthesis. Managing feeding times provides the opportunity to modify feed intake across the day, but behavioural responses are complex. Appreciating the impact of circadian rhythms provides the foundation to develop nutrition and management strategies considering circadian dynamics of intake and milk synthesis and provides opportunities for new gains in cow efficiency, welfare, and health.

Keywords: chrononutrition, daily pattern, diurnal, feeding behaviour, rumen fermentation, rumination, synchrony.

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