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首页> 外文期刊>Tropical Animal Health and Production >Recovery from adverse effects of heat stress on slow-growing chicks in the tropics 1: Effect of ascorbic acid and different levels of betaine
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Recovery from adverse effects of heat stress on slow-growing chicks in the tropics 1: Effect of ascorbic acid and different levels of betaine

机译：从热应激对热带地区生长缓慢的雏鸡的不利影响中恢复过来1：抗坏血酸和不同水平的甜菜碱的影响

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Three hundreds, 21 d-old slow-growing chicks were randomly divided among 5 treatments, of 5 replicates each. Each replicate contained 12 unsexed chicks housed in (1 × 1) a floor pen. A group was kept under thermoneutral condition at 28 ± 4°C and RH was 55 ± 3% during 21–84 d of age (positive control) and fed corn-soybean meal diet. The other four groups were kept for three successive days per week under heat stress (HS) at 38 ± 1.4°C and 49 ± 2% RH from 12.00 to 16.00 pm. Chicks in HS treatments were fed corn-soybean meal diet without (negative control) or with 250 mg AA/kg diet and Bet at 0.5 and 1 g/kg diet. HS decreased productive performance, increased (P 0.05) plasma glucose, serum total protein and water holding capacity (WHC) of meat. AA and 1 g of Bet/kg diet was equally potent for partial relief (P < 0.05) of the negative effect of HS on growth, increased (P < 0.05) feed intake, protein digestibility (P < 0.05), dressing out percentage, liver and giblets, whilst improved (P < 0.05) feed conversion ratio (FCR). Also, a complete recovery from the negative effect (P < 0.05) of HS shown on plasma glucose and partial recovery (P < 0.05) observed in total protein, triglyceride, blood pH, packed cell volume (PCV), hemoglobin (Hgb), rectal temperature (RT) and respiration rate (RR) and improved humoral immune competence to sheep red blood cell (SBRCs) test.
机译：将300只21 d大的生长缓慢的小鸡随机分为5种处理，每组5个重复。每个复制品包含12只未成色小鸡，它们放在（1×1）地板笔中。一组在21±84 d年龄（阳性对照）中保持在热中性条件下，温度为28±4°C，相对湿度为55±3％（饲喂玉米豆粕）。其他四组在中午12:00至16.00 pm于38±1.4°C和49±2％RH的热应激（HS）下每周连续三天。 HS处理中的小鸡饲喂玉米-豆粕日粮，不饲喂（阴性对照）或饲喂250 mg AA / kg日粮，以0.5和1 g / kg饲喂Bet。 HS降低了肉的生产性能，增加了血浆葡萄糖，血清总蛋白和持水量（WHC）（P 0.05）。 AA和1 g Bet / kg日粮同样能有效缓解HS对生长的负面影响（P <0.05），增加（P <0.05）采食量，蛋白质消化率（P <0.05），换料率，肝脏和内脏，同时提高了（P <0.05）饲料转化率（FCR）。同样，从HS对血浆葡萄糖的负面影响（P <0.05）可以完全恢复，而在总蛋白，甘油三酸酯，血液pH，堆积细胞体积（PCV），血红蛋白（Hgb），直肠温度（RT）和呼吸频率（RR）以及提高的针对绵羊红细胞（SBRCs）的体液免疫能力。

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