Mottled yolk

monica

Some degree of mottling occurs in more than 50% of all eggs. The severity of mottling increases as eggs become stale. Discoloured yolks are rare.
有些情况下色斑蛋会超过50%。后期随色斑蛋的变质，蛋黄颜色会逐渐变灰，但是褪色的情况很少发生。
Mottled yolks have been attributed to:色斑蛋可归因如下：
1 Poor handling and storage 较差的操作和储存
Minimise storage time on the farm by: 可以通过以下措施达到减少贮存时间
?increasing the number of pick-ups per week for grading or delivery to retail outlets.
增加每周捡蛋的次数，及时分级或送给零售商
?collecting and packing eggs laid on pick-up days so that they are consigned on that day.
在捡蛋的当天收集并包装，以便能当天运输出去
?grading eggs while they are fresh when packing on the farm. Do not allow the temperature in the layer shed to become too high. Keep the coolroom temperature below 20 癈, e.g. at 12 to 15 癈 (guidelines/requirements may vary in different countries) and the humidity at 70 to 80%.
在鸡刚下蛋后就将蛋分级并包装。产蛋鸡舍内温度不能太高。冷库的温度要低于20度，即在12到15度之间（不同国家的规范/要求会有差异）
Examine egg handling procedures and equipment and modify to minimise rough handling. Oil eggs soon after collection. Use only an oil approved for this purpose by the relevant authorities.
检查处理鸡蛋的操作过程以及设备，尽可能作到精细。收集好鸡蛋后，要喷油。要使用相关部门允许的用于保存目的的油。

2 Thin shells 薄壳
Make sure that feed contains the correct amounts and proportions of nutrients, particularly calcium.
要确保饲料中含有正确数量及比例的营养，尤其是钙。

3 Gossypol in cottonseed meal  棉籽粕中的棉酚
Limit cottonseed meal with high gossypol content to 5% of the layer diet (recent work indicates that up to 10% of some solvent-extracted cottonseed meal products can be safely used as they have low levels of gossypol due to newer varieties and improved processing). If the diet contains high gossypol cottonseed meal, add iron at the rate of 0.05% by weight of the diet. This can be achieved by adding ferrous sulphate powder at the rate of 0.25% by weight of the diet.
要限制高棉酚的棉籽粕在产蛋鸡日粮中的用量不超过5%（最近有研究表明，一些用浸提工艺处理的棉籽粕可以用到10%，因为经过一些新品种以及加工工艺的改善，可以降低棉酚的含量）。如果日粮中含有高棉酚的棉籽粕，在日粮中用0.05%的铁。可以用0.25%硫酸亚铁来提供。

4 Certain antioxidants 一些抗氧化剂
Do not feed gallic acid or tannic acid to laying hens.在产蛋鸡日粮中不要使用没食子酸和单宁酸。

5  Raw soybean meal 生豆粕
Use only heat-treated soybean products in layer diets. 对产蛋鸡，只使用加热工艺生产的豆粕。

[ 本帖最后由 monica 于 2007-5-10 23:32 编辑 ]

谋易

一个执着又沉稳的女孩子，见过两次面了，和不错的．

矮子

I dont  need to translate into chinese if every member insists on doing their job with ur attitude.  But I have to.

易林

Hi,dear monica, the article you offered is good,i'm very interest in poultry nutrition, could you
pls offer some more?
Wish you happy & lucky.

山中的漫游者

易林可是行业内养鸡的高手，当年，我面对他，都很害怕的，大家多多想他请教啊！:hehes: