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Milk production, fluid balance and temperature regulation in lactating camels (Camelus dromedarius)

Bekele, Tafesse (2010). Milk production, fluid balance and temperature regulation in lactating camels (Camelus dromedarius). Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2010:99
ISBN 978-91-576-7544-6
[Doctoral thesis]

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Abstract

The aims of this thesis were to identify good milking and watering routines for camels, and to better understand the physiological mechanisms that enable camels to produce milk during long periods of water deprivation. Milk production was increased by changing the number of milkings from one to four times per day in an on-farm study. Camels that calved in the long dry season had a higher lactation yield than those that calved in the wet season. Seven camels were subjected to four watering regimes, each 16 days long with 5 days of daily watering in between. The regimes were: water offered once every day (W1); offered on days 4, 8, 12 and 16 (W4); on days 8 and 16 (W8) or on day 16 (W16). Milk yield decreased after about 8 days of water deprivation, and changes in milk fat, lactose and protein concentrations remained small during W16. Contrary to widespread belief, dehydrated camels did not dilute their milk, instead milk and blood plasma osmolality increased in parallel. Camels saved water by storing heat during daytime allowing body temperature to increase, and dissipating the heat during the cool night. Afternoon body temperature was around 39.0°C in all treatments but fell by 3 to 6°C at night, with the lowest recorded values in severely hydrated camels. Despite low morning body temperatures, camels sought shade to avoid evaporative water loss but after drinking, they spent more time in the sun. Water deprived camels are known to compensate the number of kilograms of body weight lost by drinking equivalent number of liters of water, and this has been assumed to indicate a full recovery. However, diminished food and salt intake, and sodium loss via urine and feces, are seldom considered. During dehydration, W16 camels increased plasma vasopressin levels, which decreased upon drinking, but aldosterone concentration increased to retain sodium and camels took more than two weeks to recover. Camels maintained milk production during 8 days of water deprivation, to improve milk production, more frequent watering is recommended in the dry season.

Authors/Creators:Bekele, Tafesse
Title:Milk production, fluid balance and temperature regulation in lactating camels (Camelus dromedarius)
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2010
Volume:2010:99
Number of Pages:55
Papers/manuscripts:
NumberReferences
ALLI. Milk production performance of the one humped camel (Camelus dromedarius) under pastoral management in semi-arid eastern Ethiopia.Bekele, T., M. Zeleke, and R.M.T. Baars Livestock Production Science, 76 (2002) 37-44 II. Milk production and feeding behavior in the camel (Camelus dromedarius)during four watering regimes. Bekele, T., N. Lundeheim, and K. Dahlborn Journal of Dairy Science, (2010), Accepted for publication III. Effects of water deprivation on body temperature and behavior in the lactating camel (Camelus dromedaries). Bekele, T., K. Olsson, and K. Dahlborn Manuscript IV. Salt and water regulation in the lactating camel (Camelus dromedarius).Bekele, T., K. Olsson, and K. Dahlborn Manuscript
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7544-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:camels, body weight, milk production, milk performance, water metabolism, water deprivation, body temperature, behaviour, ethiopia
Keywords:Keywords: aldosterone, camel, body weight, milk osmolality, blood plasma, temperature regulation, water deprivation, vasopressin.
URN:NBN:urn:nbn:se:slu:epsilon-3140
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3140
ID Code:2421
Department:(VH) > Dept. of Anatomy, Physiology and Biochemistry
Deposited By: Kristina Dahlborn
Deposited On:22 Dec 2010 00:00
Metadata Last Modified:30 Mar 2017 15:19

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