Milk Composition of Asian Elephants (Elephas maximus) in a Natural Environment in Myanmar during Late Lactation
Ellen S. Dierenfeld, LLC, St. Louis, MO 63128, USA
School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Southwell NG25 0QF, UK
Department of Medical Research (Pyin-Oo-Lwin Branch), Pyin-Oo-Lwin 05081, Myanmar
Department of Physiology and Biochemistry, University of Veterinary Science, Yezin 05282, Myanmar
Veterinarians International, One Penn Plaza, Suite 6337, New York, NY 10119, USA
Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK
Extraction Department, Magway Region, Myanma Timber Enterprise, Magwe 0411, Myanmar
Department of Biology, University of Turku, 20014 Turku, Finland
Department of Public Health, University of Turku and Turku University Hospital, 20520 Turku, Finland
Author to whom correspondence should be addressed.
Received: 29 February 2020
Revised: 16 April 2020
Accepted: 19 April 2020
Published: 22 April 2020
In this study, we analyzed longitudinal milk samples and consumed plant species from six Asian elephants managed in their natural environment and consuming native plants in Myanmar to evaluate seasonal or animal-related changes in milk content and diet. Milk from mothers nursing calves aged one-and-a-half to three years was high in fat; milk solids and protein percentages increased for older calves, and protein levels increased in both milk and plants during the wet versus dry season. Higher protein levels in plants eaten by these elephants during the wet season compared to the dry season may underlie the seasonal milk changes observed. Milk consumed by female calves was higher in protein compared with male calves. Maternal traits such as size, age, origin (captive-born vs. wild-born) and number of previous calves, were also significantly associated with milk composition. Understanding such factors influencing milk production and composition contributes to improving feeding management strategies to optimize the nutrition, health, and feeding management of both wild and captive elephant populations.