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수수에 의한 옥수수의 대치가 산란계의 산란능력 및 영양소 이용율에 미치는 영향
박재환,한인규,하종규 ( J . H . Park,I . K . Han,J . K . Ha ) 한국축산학회 1985 한국축산학회지 Vol.27 No.8
To examine the relative nutritive value of sorghum to corn for laying hen, 20 weeks old 240 Single Comb White Leghorn (SCWL) starting layer were employed and randomely assigned to each of 5 experimental diets which were prepared by the substitution of sorghum for corn portion (60%) of the basal diet with various ratios, ie, 60% corn (control), 45% corn + 15% sorghum, 30% corn + 30% sorghum, 15% corn + 45% sorghum and 60% sorghum. Five groups of starting layers employed in this study has been pretreated with the same manner as laying period during the growing period. Hens were fed phase I (21-42 weeks) and phase II diet (43-62 weeks) during the laying period, and laying performances were examined. Egg production rate tended to decrease with the increase of sorghum level. However, only 60% sorghum group showed significantly (p$lt;0.01) low egg production (75.28%) as compared to that of control group (79.42%). In average egg weight and feed efficiency, there was no significant (p$gt;0.05) difference among treatments. Feed consumption tended to decrease with increased sorghum level with no significant (p$gt;0.05) differences among treatments. Egg yolk color index was significantly (p$lt;0.01) affected by the substitution level of sorghum. There were no significant differences among treatments in dry matter, crude protein, crude fat, and total carbohydrate utilizabilities. However, sorghum 60% group showed a little lower crude protein utilizability compared with other dietary groups.