The effect of dietary energy and protein levels on production in breeding female ostriches
The effect of dietary energy and protein levels on production in breeding female ostriches
复制标题
膳食能量和蛋白质水平对繁殖雌鸵鸟产量的影响
DOI：
10.1080/00071660310001618343
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发表时间：
2003
影响因子：
2
通讯作者：
C.R. Brown
中科院分区：
文献类型：
--
作者：
Z. Brand;T. Brand;C.R. Brown
1. 在一项跨越两个繁殖季节的研究中，我们评估了不同膳食能量和蛋白质水平对雌性鸵鸟体重、身体状况和产蛋量的影响。2. 在第一个繁殖季节，各组饲喂能量浓度分别为8.5、9.5和10·5 MJ/kg干质量（DM）、代谢能（ME）和蛋白质浓度分别为135、150和165 g/kg的饲粮。在第二繁殖季，各组饲喂代谢能分别为7.5、8.5和9.5 MJ/kg，蛋白质含量分别为105、120和135 g/kg的饲粮。3. 与饲粮能量含量较高的鸟类相比，饲粮代谢能为7.5和8.5 MJ/kg的鸟类的体重在整个繁殖季节显著下降，体型测量值下降，表明身体状况的丧失。4. 饲粮中代谢能仅为7.5 MJ/kg的雌鸟产蛋量显著减少，产蛋间隔显著延长，雏鸟孵化量显著减少。5. 鸡蛋质量、初雏质量、1月龄雏鸡成活率和1月龄雏鸡体质量无显著差异。6. 饲粮蛋白质浓度对产蛋量、产蛋量、孵化率、初始鸡质量、成活率和1月龄鸡质量均无影响。7. 在两个繁殖季节之间的4个月休息期间，雌鸵鸟的体重恢复到原来的水平，但在第二个繁殖季节，某些参数的显著差异表明它们的身体状况可能没有完全恢复。8. 试验证明，饲粮能量含量为7.5 MJ/kg对雌鸵鸟产蛋量有不利影响，本研究认为，在不影响产蛋量的情况下，饲粮代谢能含量为8.5 MJ/kg DM，蛋白质含量为105 g/kg可作为繁殖雌鸵鸟的最低饲粮。
1. In a study spanning two breeding seasons, we assessed the effect of different dietary energy and protein levels on body mass, body condition, and egg production of female ostriches. 2. During the first breeding season, groups were given diets with energy concentrations of 8·5, 9·5 and 10·5 MJ/kg dry mass (DM) metabolisable energy (ME) and protein concentrations of 135, 150 and 165 g/kg. In the second breeding season, groups were given diets with ME of 7·5, 8·5 and 9·5 MJ/kg and protein contents of 105, 120 and 135 g/kg. 3. Body mass of birds on diets of 7·5 and 8·5 MJ/kg ME decreased significantly in the course of the breeding season compared with birds fed on diets with higher energy contents and body measurements decreased, suggesting a loss of body condition. 4. Females fed on diets containing only 7·5 MJ/kg ME produced significantly fewer eggs at significantly longer intervals, resulting in fewer chicks hatched. 5. There was no significant difference in egg mass, initial chick mass, chick survival to one month of age and body mass of chicks at one month. 6. Dietary protein concentrations had no effect on egg production, egg mass, hatchability, initial chick mass, chick survival or chick mass at one month old. 7. The female ostriches regained their original body mass during the 4-month rest period between breeding seasons, but significant differences in some parameters during the second breeding season suggest that they may not have fully recovered their body condition. 8. A dietary energy content of 7·5 MJ/kg proved to have an adverse effect on egg production by breeding female ostriches, and it may be concluded from this study that a diet containing 8·5 MJ ME/kg DM and 105 g/kg protein should be regarded as the minimum that can be used for breeding female ostriches without compromising egg production.