The physiological and metabolic impacts on sheep and cattle of feed and water deprivation before and during transport

被引:44
作者
Hogan, James P.
Petherick, J. Carol
Phillips, Clive J. C. [1 ]
机构
[1] Univ Queensland, Sch Vet Sci, Ctr Anim Welf & Eth, St Lucia, Qld 4072, Australia
[2] Queensland Dept Primary Ind & Fisheries, Rockhampton, Qld, Australia
关键词
transport; food deprivation; water deprivation; ruminants; digesta;
D O I
10.1017/S0954422407745006
中图分类号
R15 [营养卫生、食品卫生]; TS201 [基础科学];
学科分类号
100403 ;
摘要
Sheep and cattle are frequently subjected to feed and water deprivation (FWD) for about 12h before, and then during, transport to reduce digesta load in the gastrointestinal tract. This FWD is marked by weight loss as urine and faeces mainly in the first 24 h but continuing at a reduced rate subsequently. The weight of rumen contents falls although water loss is to some extent masked by saliva inflow. FWD is associated with some stress, particularly when transportation is added. This is indicated by increased levels of plasma cortisol that may be partly responsible for an observed increase in the output of water and N in urine and faeces. Loss of body water induces dehydration that may induce feelings of thirst by effects on the hypothalamus structures through the renin-angiotensin-aldosterone system. There are suggestions that elevated cortisol levels depress angiotensin activity and prevent sensations of thirst in dehydrated animals, but further research in this area is needed. Dehydration coupled with the discharge of Na in urine challenges the maintenance of homeostasis. In FWD, Na excretion in urine is reduced and, with the reduction in digesta load, Na is gradually returned from the digestive tract to the extracellular fluid space. Control of enteropathogenic bacteria by normal rumen microbes is weakened by FWD and resulting infections may threaten animal health and meat safety. Recovery time is required after transport to restore full feed intake and to ensure that adequate glycogen is present in muscle pre-slaughter to maintain meat quality.
引用
收藏
页码:17 / 28
页数:12
相关论文
共 122 条
[1]   Hypothalamic gene expression in sheep for cocaine- and amphetamine-regulated transcript, pro-opiomelanocortin, neuropeptide Y, agouti-related peptide and leptin receptor and responses to negative energy balance [J].
Adam, CL ;
Archer, ZA ;
Findlay, PA ;
Thomas, L ;
Marie, M .
NEUROENDOCRINOLOGY, 2002, 75 (04) :250-256
[2]   Nutrition-based health in animal production [J].
Adams, Clifford A. .
NUTRITION RESEARCH REVIEWS, 2006, 19 (01) :79-89
[3]  
Agenäs S, 2006, ANIM WELFARE, V15, P149
[4]   MECHANISMS CONTROLLING FEED-INTAKE IN RUMINANTS - A REVIEW [J].
BAILE, CA ;
MCLAUGHLIN, CL .
JOURNAL OF ANIMAL SCIENCE, 1987, 64 (03) :915-922
[5]   SALIVA SECRETION AND ITS RELATION TO FEEDING IN CATTLE .2. COMPOSITION AND RATE OF SECRETION OF MIXED SALIVA IN COW DURING REST [J].
BAILEY, CB ;
BALCH, CC .
BRITISH JOURNAL OF NUTRITION, 1961, 15 (03) :383-+
[7]   WEIGHT CHANGES IN GRAZING COWS [J].
BALCH, CC ;
LINE, C .
JOURNAL OF DAIRY RESEARCH, 1957, 24 (01) :11-19
[8]  
Barcroft J, 1944, J EXP BIOL, V20, P120
[9]   A NOTE ON EFFECT OF STARVATION ON THE BOVINE ALIMENTARY-TRACT AND ITS CONTENTS [J].
BASS, JJ ;
DUGANZICH, DM .
ANIMAL PRODUCTION, 1980, 31 (AUG) :111-113
[10]   DIURNAL PATTERNS OF PLASMA-INSULIN, GROWTH-HORMONE, CORTICOSTEROID AND METABOLITE CONCENTRATIONS IN FED AND FASTED SHEEP [J].
BASSETT, JM .
AUSTRALIAN JOURNAL OF BIOLOGICAL SCIENCES, 1974, 27 (02) :167-181