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The response of reproducing Japanese quail to dietary valine
British Poultry Science ( IF 2 ) Pub Date : 2021-04-13 , DOI: 10.1080/00071668.2021.1905775
K N M Martinez 1 , G da S Viana 2 , E P da Silva 1 , M P Reis 1 , R M Gous 3 , N K Sakomura 1
Affiliation  

ABSTRACT

1. A feeding trial was conducted to measure the responses of Japanese quail to dietary valine. In total, 280 Japanese quail were randomly assigned to eight treatments giving seven replicates (cage – 35 cm length, 35 cm width × 15 cm high). Experimental diets were formulated using a dilution technique to give a range dietary Val concentration (1.97 to 9.85 g/kg).

2. Feed intake was maximised at 6.66 g Val/kg and above, but declined linearly below this level. Body weight reached a maximum of 170 g on 6.66 g Val/kg. Egg output peaked at 9.5 ± 0.3 g/bird/d with an egg weight of 11 g for the 6.66 g Val/kg diet. Rate of laying for the group that received the feed with the lowest Val content was close to zero (1.40%), but egg weight on this treatment was 70% of the maximum egg weight. Valine required per gram of egg output was estimated as 10.6 mg/g, whereas the maintenance requirement was 159 mg/kg body weight. Val required for maximum egg output was estimated in 154 mg/d.

3. The marginal cost of Val in Brazil currently is negative below a level of 8.0 g/kg feed, which is above that required for maximum egg output. Consequently, Val cannot be regarded as a limiting amino acid currently, as the optimum economic intake exceeds the requirements of all the individuals in the population. The price of a quail egg weighing 11 g in Brazil at the time of the experiment was R$ 0.021. Even if the marginal revenue for these eggs was doubled to 0.4 c/g, there would be no reason to increase the intake of Val.



中文翻译:

繁殖日本鹌鹑对膳食缬氨酸的反应

摘要

1. 进行了一项饲养试验,以测量日本鹌鹑对膳食缬氨酸的反应。总共有 280 只日本鹌鹑被随机分配到八个处理中,提供七个重复(笼子长 35 厘米,宽 35 厘米 × 高 15 厘米)。使用稀释技术配制实验日粮以提供一定范围的日粮 Val 浓度(1.97 至 9.85 g/kg)。

2. 在 6.66 g Val/kg 及以上时,采食量最大,但低于此水平线性下降。体重在 6.66 g Val/kg 时达到最大 170 g。对于 6.66 g Val/kg 日粮,产蛋量最高为 9.5 ± 0.3 g/禽/天,蛋重为 11 g。接受 Val 含量最低的饲料组的产蛋率接近于零 (1.40%),但这种处理的蛋重是最大蛋重的 70%。每克产蛋量所需的缬氨酸估计为 10.6 毫克/克,而维持需要量为 159 毫克/千克体重。最大产蛋量所需的缬氨酸估计为 154 毫克/天。

3. 目前巴西 Val 的边际成本低于 8.0 g/kg 饲料的水平,高于最大产蛋量所需的水平。因此,目前不能将 Val 视为限制性氨基酸,因为最佳经济摄入量超过了人群中所有个体的需求。实验时,巴西一个重 11 克的鹌鹑蛋的价格为 0.021 雷亚尔。即使这些鸡蛋的边际收益翻倍至 0.4 c/g,也没有理由增加 Val 的摄入量。

更新日期:2021-04-13
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