蛋种鸭日粮色氨酸需要量的评估：对生产性能、繁殖性能、蛋品质、生殖器官和卵泡发育以及血清生化指标的影响
Estimation of dietary tryptophan requirement for laying duck breeders: effects on productive and reproductive performance, egg quality, reproductive organ and ovarian follicle development and serum biochemical indices.
作者信息
Zhang Y N, Ruan D, Wang S, Huang X B, Li K C, Chen W, Xia W G, Wang S L, Zheng C T
机构信息
Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition, 510640, Guangzhou, China.
Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition, 510640, Guangzhou, China.
出版信息
Poult Sci. 2021 Aug;100(8):101145. doi: 10.1016/j.psj.2021.101145. Epub 2021 Mar 23.
This study aimed to determine the dietary tryptophan (Trp) requirement for laying duck breeders. A total of 504 Longyan duck breeders (body weight: 1.20 ± 0.02 kg) aged 22 wk were randomly allocated to 6 treatments, each with 6 replicates of 14 ducks. During the next 16 wk, birds were fed the basal diet with total Trp contents of 1.00, 2.00, 3.00, 4.00, 5.00 and 6.00 g/kg, respectively. Dietary Trp levels increased egg production, egg mass and feed intake of duck breeders from 22 to 37 wk (P < 0.05), and there were linear and quadratic effects of Trp level (P < 0.05). The feed conversion ratio (FCR) quadratically decreased with dietary Trp levels (P < 0.05). Dietary Trp levels decreased (P < 0.05) egg albumen height and Haugh unit at wk 8 or 12, and the responses were linear and quadratic (P < 0.05). The body weight of breeders, absolute and relative weight of oviduct, number and total weight of preovulatory follicles (POF), and its proportion relative to ovarian weight were increased (P < 0.05), and the responses were linear (P < 0.01) and quadratic (P < 0.001). Ovarian weight increased quadratically (P < 0.05), and the mean weight of POF increased (P < 0.05), linearly and quadratically. The proportion of small yellow follicles relative to ovary weight decreased (P < 0.01) linearly and quadratically. At wk 16 of the trial period, the serum albumin content and alanine aminotransferase activity decreased (P < 0.05) and the creatinine content increased (P < 0.01) linearly and quadratically. The Trp requirements were estimated to be 3.14 g/kg for optimizing egg production, 2.93 g/kg for egg mass, and 2.92 g/kg for FCR. Overall, dietary Trp levels (1 to 6 g/kg) affected productive performance, egg quality, reproductive organ and ovarian follicle development, and serum biochemical indices of layer duck breeders, and a diet containing 2.9 to 3.1 g Trp per kg feed was adequate during the laying period (22 to 37 wk of age).
本研究旨在确定蛋鸭种鸭的日粮色氨酸（Trp）需求量。选取504只22周龄的龙岩蛋鸭种鸭（体重：1.20±0.02千克），随机分为6组处理，每组14只鸭，设6个重复。在接下来的16周内，分别给各组种鸭饲喂色氨酸总含量为1.00、2.00、3.00、4.00、5.00和6.00克/千克的基础日粮。日粮色氨酸水平提高了22至37周龄蛋鸭种鸭的产蛋量、蛋重和采食量（P<0.05），且色氨酸水平存在线性和二次效应（P<0.05）。饲料转化率（FCR）随日粮色氨酸水平呈二次降低（P<0.05）。日粮色氨酸水平降低了第8周或第12周的蛋清高度和哈夫单位（P<0.05），且响应呈线性和二次关系（P<0.05）。种鸭体重、输卵管绝对重量和相对重量、排卵前卵泡（POF）数量和总重量及其相对于卵巢重量的比例均增加（P<0.05），且响应呈线性（P<0.01）和二次关系（P<0.001）。卵巢重量呈二次增加（P<0.05），POF平均重量增加（P<0.05），呈线性和二次关系。小黄卵泡相对于卵巢重量的比例呈线性和二次降低（P<0.01）。在试验期第16周，血清白蛋白含量和丙氨酸氨基转移酶活性呈线性和二次降低（P<0.05），肌酐含量增加（P<0.01）。估计色氨酸需求量为：优化产蛋量时为3.14克/千克，蛋重时为2.93克/千克，FCR时为2.92克/千克。总体而言，日粮色氨酸水平（1至6克/千克）影响蛋鸭种鸭的生产性能、蛋品质、生殖器官和卵巢卵泡发育以及血清生化指标，产蛋期（22至37周龄）每千克饲料含2.9至3.1克色氨酸的日粮是适宜的。
Zotero 插件