The effects of 24H water deprivation when associated with some aspects of transportation on the behaviour and blood chemistry of sheep

Citation
Re. Jackson et al., The effects of 24H water deprivation when associated with some aspects of transportation on the behaviour and blood chemistry of sheep, ANIM WELFAR, 8(3), 1999, pp. 229-241
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ANIMAL WELFARE
ISSN journal
0962-7286 → ACNP
Volume
8
Issue
3
Year of publication
1999
Pages
229 - 241
Database
ISI
SICI code
0962-7286(199908)8:3<229:TEO2WD>2.0.ZU;2-2
Abstract
When sheep are transported they are potentially exposed to a number of fact ors, including water and feed deprivation, low space allowance and elevated environmental temperature, that are not related to vehicle motion but coul d result in animal welfare problems, either on their own or in combination. In a 2x2 factorial experiment, groups of sheep (n = 6) were moved from ind ividual pens where they had access to hay and water to environmental chambe rs kept at either 14 degrees C or 21 degrees C. Within each chamber, half t he sheep had access to water but they were all kept at a space allowance of 0.41 m(2) sheep(-1) without feed. After 24h they were returned to their in dividual pens and offered hay and water. Behaviour and a range of biochemic al measurements of dehydration and feed restriction were recorded before, d uring and after the treatment period. During the treatment period there was no evidence of dehydration, and sheep with access to water drank less than they did before the treatment. The plasma concentration of free fatty acid s increased during fasting and, post-treatment, the intake of hay was great er than before treatment. The rapid post-treatment intake of dry feed was a ssociated with some evidence of dehydration, as indicated by increased plas ma osmolality and plasma vasopressin concentration. This suggests that foll owing provision and consumption of large quantities of feed after a period without access to feed and water during transportation, sheep must be allow ed sufficient time to drink before a subsequent journey is undertaken.