The effects of water replacement by oral rehydration fluids with or without betaine supplementation on performance, acid-base balance, and water retention of heat-stressed broiler chickens

被引:36
|
作者
Sayed, M. A. M. [1 ]
Downing, J. [1 ]
机构
[1] Univ Sydney, Fac Vet Sci, Camden, NSW 2570, Australia
关键词
oral rehydration; broiler; betaine; heat stress; DIETARY ELECTROLYTE BALANCE; AMBIENT-TEMPERATURE; BLOOD-VISCOSITY; MINERAL BALANCE; GLUCOSE; SODIUM; BODY; THERMOBALANCE; ACCLIMATION; CHLORIDE;
D O I
10.3382/ps.2009-00594
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Exposing broilers to a high temperature increases water and electrolyte K+ and Na+ excretion, which negatively affects the heat dissipation capacity and acid-base homeostasis, resulting in losses in growth performance. In this experiment, the efficacy of providing oral rehydration therapy and betaine on growth performance, acid-base balance, and water and electrolyte retention was evaluated. A total of 432 one-day-old broiler chicks (Cobb) were allocated to 72 metabolic cages and reared to 31 d of age under standard conditions. From 32 to 41 d of age, chicks were exposed to heat stress (ambient temperature, 32 C) and high RH (80 to 100% RH) for 9 h daily. The ameliorative effects of a 3 x 3 factorial array of treatments administered via drinking water were evaluated in 8 replicates of 6 chicks per cage for each treatment. Two oral rehydration therapy (ORT) fluids, based on either citrate or bicarbonate salts, were added to tap water. In addition, betaine was added to tap water at an inclusion rate of 0, 500, or 1,000 mg/L to complete the array of 9 liquid-based treatments. Growth performance was assessed at 32, 35, and 41 d of age. From 32 to 35 d of age, chicks receiving ORT fluids exhibited improved growth performance, water balance, and electrolyte (K+, Na+) retention. In addition, the physiological response to stress was attenuated, as indicated by lower heterophil-to-lymphocyte ratios and blood glucose concentrations relative to the negative controls. The addition of betaine at an inclusion rate of 500 mg/L improved BW gain. From d 36 to 41, treatments did not significantly influence growth performance, which suggests that chicks receiving tap water were able to compensate and adapt to the heat-stress conditions. The results demonstrate that the beneficial effects of providing ORT fluids and 500 mg of betaine/L were observed only during the first 4 d of heat exposure. After this period, adaptation to the heat appears to occur, and none of the treatments was successful in improving growth performance.
引用
收藏
页码:157 / 167
页数:11
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