Mottled yolk

monica · 發(fā)表于 2007-5-10 23:10:03

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.
有些情況下色斑蛋會超過50%。后期隨色斑蛋的變質(zhì)，蛋黃顏色會逐漸變灰，但是褪色的情況很少發(fā)生。
Mottled yolks have been attributed to:色斑蛋可歸因如下：
1 Poor handling and storage 較差的操作和儲存
Minimise storage time on the farm by: 可以通過以下措施達到減少貯存時間
?increasing the number of pick-ups per week for grading or delivery to retail outlets.
增加每周撿蛋的次數(shù)，及時分級或送給零售商
?collecting and packing eggs laid on pick-up days so that they are consigned on that day.
在撿蛋的當天收集并包裝，以便能當天運輸出去
?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%.
在雞剛下蛋后就將蛋分級并包裝。產(chǎn)蛋雞舍內(nèi)溫度不能太高。冷庫的溫度要低于20度，即在12到15度之間（不同國家的規(guī)范/要求會有差異）
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.
檢查處理雞蛋的操作過程以及設備，盡可能作到精細。收集好雞蛋后，要噴油。要使用相關部門允許的用于保存目的的油。

2 Thin shells 薄殼
Make sure that feed contains the correct amounts and proportions of nutrients, particularly calcium.
要確保飼料中含有正確數(shù)量及比例的營養(yǎng)，尤其是鈣。

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產(chǎn)蛋雞日糧中的用量不超過5%（最近有研究表明，一些用浸提工藝處理的棉籽粕可以用到10%，因為經(jīng)過一些新品種以及加工工藝的改善，可以降低棉酚的含量）。如果日糧中含有高棉酚的棉籽粕，在日糧中用0.05%的鐵?？梢杂?/font>0.25%硫酸亞鐵來提供。

4 Certain antioxidants 一些抗氧化劑
Do not feed gallic acid or tannic acid to laying hens.在產(chǎn)蛋雞日糧中不要使用沒食子酸和單寧酸。

5 Raw soybean meal 生豆粕
Use only heat-treated soybean products in layer diets. 對產(chǎn)蛋雞，只使用加熱工藝生產(chǎn)的豆粕。

[ 本帖最后由 monica 于 2007-5-10 23:32 編輯 ]