Effect of Vitamin B12 on Hatchability of Hens fed Petroleum Yeast
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概要
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The effect on the fertility and hatchability of white Leghorn fed yeast produced from pure n-paraffin was studied.The contents of crude protein, metabolisable energy and vitamin B12 of the yeast were 64%, 3.39kcal/g and 0.02μg/g on dry-basis, respectively.When all of the fish meal and part of the soybean meal in the control ration was replaced by the yeast at the dietary levels of 10, 15 and 20%, actually no difference was observed in fertility of the hens fed either control or yeast ration. However, hatchability of fertile eggs of hens fed the yeast were much poorer than the control. The hatchability of eggs on 10 and 15% yeast diet was significantly poorer than that on the control diet, being about 50% of the control. Most of the dead germs was found from 19th to 21st day after setting eggs in the brooder. The content of vitamin B12 in the eggs on the rations contained 10 and 15% of yeast were much lower than that on the control diet, being 0.14and 0.22μg%, respectively. That of the control died was 0.86μg%.Intra-musclar injection of 1μg of vitamin B12 per bird on alternative days significantly improved the hatchability of fertile eggs on the yeast ration. The effect was so drastic that the hatchability was improved already at the 2nd day after the first injection of vitamin B12.Therefore low hatchability of fertile eggs was due to the lack of vitamin B12 in the eggs. It was suggested that care must be taken especially on vitamin B12, when petroleum yeast was fed in place of fish meal.
- 日本家禽学会の論文
日本家禽学会 | 論文
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