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Development of vocalization and hearing in American mink (Neovison vison)

Lookup NU author(s): Dr Christian Brandt

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Abstract

American mink (Neovison vison) kits are born altricial and fully dependent on maternal care, for which the kits' vocalizations appear essential. We used auditory brainstem responses (ABRs) to determine: (1) hearing sensitivity of adult females from two breeding lines known to differ in maternal behaviour and (2) development of hearing in kits 8–52 days of age. We also studied sound production in 20 kits throughout postnatal days 1 to 44. Adult female mink had a broad hearing range from 1 kHz to above 70 kHz, with peak sensitivity (threshold of 20 dB SPL) at 8–10 kHz, and no difference in sensitivity between the two breeding lines (P>0.22) to explain the difference in maternal care. Mink kits showed no signs of hearing up to postnatal day 24. From day 30, all kits had ABRs indicative of hearing. Hearing sensitivity increased with age, but was still below the adult level at postnatal day 52. When separated from their mothers, kits vocalized loudly. Until the age of 22 days, 90% of all kits vocalized with no significant decline with age (P=0.27). From day 25, concurrent with the start of hearing, the number of vocalizing kits decreased with age (P<0.001), in particular in kits that were re-tested (P=0.004). Large numbers of mink are kept in fur industry farms, and our results are important to the understanding of sound communication, which is part of their natural behaviour. Our results also suggest mink as an interesting model for studying the development of mammalian hearing and its correlation to sound production.


Publication metadata

Author(s): Brandt C, Malmkvist J, Nielsen RL, Brande-Lavridsen N, Surlykke A

Publication type: Article

Publication status: Published

Journal: Journal of Experimental Biology

Year: 2013

Volume: 216

Pages: 3542-3550

Print publication date: 20/06/2013

ISSN (print): 0022-0949

ISSN (electronic): 1477-9145

Publisher: The Company of Biologists Ltd

URL: http://dx.doi.org/10.1242/jeb.080226

DOI: 10.1242/jeb.080226


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