The effect of DL-methionine and betaine on growth performance and carcass characteristics in broilers
The effect of DL-methionine and betaine on growth performance and carcass characteristics in broilers
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DOI：
10.1016/s0377-8401(00)00174-7
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发表时间：
2000-09-30
影响因子：
3.2
通讯作者：
Mack, S
中科院分区：
文献类型：
--
作者：
Esteve-Garcia, E;Mack, S
进行了一项实验，以确定甜菜碱是否可以在蛋氨酸缺乏的饮食中取代蛋氨酸。为了避免甜菜碱作为甲基供体、渗透保护剂或球虫促进剂的影响，添加了足量的甲基供体化合物，并利用DEN条件减少了球虫病的挑战。576只1日龄肉用母鸡按3(0，0.6，1.2g/kg DL-蛋氨酸)x2(0和0.5g/kg甜菜碱)因素安排在0~41日龄之间饲喂6种日粮中的一种。基础日粮含蛋氨酸3.2g/kg(0~21日龄)、2.8g/kg(21~38d)和2.5g/kg(38~41日龄)，胱氨酸3.4g/kg(0~21d)、3.6g/kg(21~38d)和3.5g/kg(38~41日龄)。每个处理有12只鸡的8个重复。分别在第21天和41天进行性能测定。最后，测定了每个重复9只鸡的屠宰和乳房产量，以及每个重复3只鸡的腹部FAR。甜菜碱和DL-蛋氨酸之间没有显著的交互作用。DL-蛋氨酸提高(P<；0.001)体重和饲料以增加21日龄和41日龄增重，而甜菜碱的影响相对较小，不显着(P>；0.1)。添加不同水平的蛋氨酸均能提高乳房产量(P<；0.001)，而甜菜碱能提高屠宰量(P<；005)。这些结果表明，甜菜碱不能取代蛋氨酸作为蛋白质代谢中的必需氨基酸，但可能会提高屠宰率。(C)2000 Elsevier Science B.V.保留所有权利。
An experiment was conducted to determine if betaine could replace methionine in a methionine deficient diet. In order to avoid the effects of betaine as methyl group donor or as osmoprotectant or coccidiostat enhancer, sufficient amounts of methyl donating compounds were added and dean conditions were used to reduce the coccidiosis challenge.A total of 576 day-old female broiler chicks were fed one of six diets in a 3 (0, 0.6, 1.2 g/kg of DL-methionine)x2(0 and 0.5 g/kg of betaine) factorial arrangement between 0 and 41 days. The basal diet contained 3.2 g/kg (0-21 days), 2.8 g/kg (21-38 days) and 2.5 g/kg (38-41 days), of methionine, respectively; 3.4 g/kg (0-21 days), 3.6 g/kg (21-38 days) and 3.5 g/kg (38-41 days) of cystine. There were eight replicates of 12 birds per treatment. Performance was determined at 21 and 41 days. At the end, carcass and breast yields were determined on nine chickens per replicate, and abdominal far on three chickens per replicate.There were no significant interactions between betaine and DL-methionine. DL-methionine improved (P < 0.001) body weight and feed to gain at 21 and 41 days whereas the effects of betaine were relatively small and not significant (P > 0.10). Breast yield increased at all levels of DL-methionine addition (P < 0.001), while betaine increased carcass yield (P < 0.05). These results suggest that betaine does not replace methionine in its function as essential amino acid in protein metabolism, but may improve carcass yield. (C) 2000 Elsevier Science B.V. All rights reserved.