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Heat abatement during the pre-weaning period: effects on lying behavior and disbudding-related responses of male Holstein calves

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Abstract

Strategies to abate heat stress are seldom adopted for pre-weaned dairy calves and little is known about their effects on behavior and pain sensitivity of youngstock. Our objectives were to determine the effects of heat stress abatement on lying behavior and disbudding-related pain sensitivity, wound healing, and change in intake. Male Holstein calves (n = 60; 0 to 68 d of age) were assigned randomly at birth (d 0) to 1 of 3 treatments: hutch outdoors with 50% of its area covered with plywood (control = 20), hutch in a barn with no cooling (SH = 21), and hutch in a barn with ceiling fans (SHF = 19). Calves were fitted with lying-behavior loggers on the hind leg from d 1 to 68. On d 32 ± 8 (±SD), we disbudded calves using hot iron, 30 min after cornual nerves were blocked with lidocaine. Immediately before (0 h), and at 1, 2, and 3 h after disbudding, we evaluated calves for mechanical nociceptive threshold (MNT) and head (ear flick, head shake, head rubbing) and somatic (tail flicking, foot stamping, restlessness) behaviors. On d 1, 3, 7, and 14 after disbudding, we evaluated the MNT and, on d 7 and 14, we evaluated wound healing (1 = crust, 5 = exudate). We calculated the relative change in milk solids and starter intake from d 0 to 6 relative to disbudding compared with the average of the 72 h preceding the procedure. The lying time was 0.6 h/d greater for the SHF treatment compared with the SH treatment. The control treatment resulted in 3.2 and 4.1 more lying bouts per day than the SH and SHF treatments, respectively; consequently, the control treatment resulted in lying-bout duration 7.7 and 10.9 min/event shorter than the SH and SHF treatments, respectively. We did not detect an effect of treatment on the number of disbudding-related head and somatic behaviors and MNT. The odds of calves having abnormal wound was 3.5 and 3.2 times greater for the control treatment compared with the SH and SHF treatments, respectively. We did not detect an effect of treatment on the relative change in intake of milk solids and starter. Heat abatement improves the welfare of pre-weaned dairy calves and may hasten healing.

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Acknowledgements

The authors thank the owner and staff of the collaborating dairy. They extend their gratitude to VES Environmental Solutions, Chippewa Falls, WI, and Dairy Farmers of America for partial financial support.

Funding

Partial financial support was received from VES Environmental Solutions, Chippewa Falls, WI and Dairy Farmers of America.

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Correspondence to Ricardo C. Chebel.

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All procedures involving animals were approved by the animal care and use committee of the University of Florida (protocol #201910796).

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The authors declare no competing interests.

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Montevecchio, A.B., Frota, W., Merenda, V.R. et al. Heat abatement during the pre-weaning period: effects on lying behavior and disbudding-related responses of male Holstein calves. Int J Biometeorol 66, 2159–2168 (2022). https://doi.org/10.1007/s00484-022-02319-w

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  • DOI: https://doi.org/10.1007/s00484-022-02319-w

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