Effects of sweet potato [Ipomoea batatas] litters as supplemental feed on egg-laying of hens
2007
Takenoyama, S.(Miyazaki Univ. (Japan). Faculty of Agriculture) | Kawahara, S. | Hayashi, H. | Imoto, T. | Nagase, T. | Ando, T. | Ishiguro, K. | Yoshimoto, M. | Muguruma, M.
The effects of sweet potato litters (SPL), produced in the southern part of Kyushu Island in Japan, on Hendy Fecundation Rate (HFR), feeds intake, egg quality such as functional ingredient in the yolk, lipid content, fatty acids composition, vitamin E as well as the lutein content were investigated. Hens (Hy-line brown) used were divided to four groups. The first group was fed an ordinary diet and was considered the control group. The treatment groups were fed an ordinary diet with 3%, 5% and 10% of SPL respectively. The HFR in treated groups at the 5% and 10% levels insignificantly tended to be low when compared to the control subjects. The HFR in the group fed with 3% SPL was found to be slightly higher than those in other groups, including control group. Feed intake was slightly affected by the concentration of SPL in the diet. When SPL proportion increased the feed intake increased, though the concentrate slightly decreased. Diet did not affect lipid content and fatty acids composition. Alfa tocopherol content in the yolks increases as the percentage of SPL increased, though insignificantly. However, lutein content in the yolk in the group treated with 10% SPL significantly increased when compared to control group. Vitamin E and lutein that exist in the SPL might shift in the yolk in eggs.
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