ABSTRACT

1. A study was conducted to evaluate the effects of including graded levels of an alternate protein mixture (APM) containing cottonseed meal, distillery dried grain with solubles and mustard seed meal in a fixed ratio as a substitute for soybean meal in layer diets (hens aged 27 to 46 weeks). The trial studied the possibility of higher inclusion levels of APM with increased dietary concentrations of crude protein (CP) or critical amino acids (CAA).

2. Maize–soybean meal diet was used as the control diet. In experiment 1, APM was included at 0, 120, 160 and 200 g/kg diet (145 g/kg CP). In experiment 2, the control and three test diets (200 g/kg APM) with three levels of CP (145, 155 and 165 g/kg) were used. In experiment 3, a control and four test diets (200 g/kg APM) with four concentrations of CAA (100%, 105%, 110% and 115% relative to the control) were used. In all experiments, each diet was fed ad libitum to nine replicates of 88 birds each, housed in colony cages.

3. In experiment 1, egg production (EP) and feed intake (FI) were not affected by feeding up to 160 g/kg APM, but, at 200 g/kg, EP was significantly reduced. Feed conversion ratio (FCR) for the hens fed the highest level of APM was similar to the control. Egg weight (EW) and egg mass (EM) in the 160 and 200 g/kg AMS groups were lower than the control group.

4. Increase in dietary CP from 145 to 155 g/kg improved EP and reduced FCR to levels similar to the control group. EM in hens fed 165 g/kg APM was similar to the control in experiment 2.

5. Increasing concentrations of CAA progressively improved EP and reduced FCR in experiment 3. The EP at CAA 110% and FCR at CAA 105% were similar to the control group.

6. Based on the results, it was concluded that the APM can be included up to 160 g/kg diet without affecting layer performance, as long as the diet supplied the recommended levels of protein and amino acids. By increasing either protein from 145 to 155 g/kg or CAA concentrations by 10%, the dietary levels of the APM could be increased to 200 g/kg without affecting the layer performance.

摘要

1. 进行了一项研究，以评估在蛋鸡日粮（母鸡）中加入分级水平的替代蛋白质混合物 (APM) 的效果，该混合物含有固定比例的棉籽粉、带有可溶物的酒厂干燥谷物和芥菜籽粉，以替代豆粕27 至 46 周龄）。该试验研究了随着粗蛋白 (CP) 或关键氨基酸 (CAA) 日粮浓度增加而增加 APM 含量的可能性。

2. 玉米-豆粕日粮作为对照日粮。在实验 1 中，APM 的含量为 0、120、160 和 200 g/kg 日粮（145 g/kg CP）。在实验 2 中，使用了具有三个 CP 水平（145、155 和 165 g/kg）的对照日粮和三种测试日粮（200 g/kg APM）。在实验 3 中，使用了一种对照和四种测试日粮 (200 g/kg APM)，其中四种浓度的 CAA（相对于对照而言为 100%、105%、110% 和 115%）。在所有实验中，将每种饮食随意喂食至 9 个重复，每个重复 88 只鸡，饲养在群体笼中。

3. 在实验 1 中，产蛋量 (EP) 和采食量 (FI) 不受饲喂高达 160 g/kg APM 的影响，但在 200 g/kg 时，EP 显着降低。饲喂最高水平 APM 的母鸡的饲料转化率 (FCR) 与对照组相似。160 和 200 g/kg AMS 组的蛋重（EW）和蛋重（EM）低于对照组。

4. 日粮 CP 从 145 增加到 155 g/kg 改善了 EP 并将 FCR 降低到与对照组相似的水平。饲喂 165 g/kg APM 的母鸡中的 EM 与实验 2 中的对照相似。

5. 增加 CAA 浓度逐渐改善实验 3 中的 EP 并降低 FCR。CAA 110% 的 EP 和 CAA 105% 的 FCR 与对照组相似。

6. 根据结果，可以得出结论，只要日粮提供推荐水平的蛋白质和氨基酸，APM 可以添加到 160 g/kg 日粮而不影响蛋鸡性能。通过将蛋白质从 145 增加到 155 g/kg 或 CAA 浓度增加 10%，APM 的日粮水平可以增加到 200 g/kg，而不会影响蛋鸡性能。