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제한급사에 의한 산란계의 합리적인 육성방법에 관한 연구
오봉국,박상문 ( B . K . Ohh,S . M . Park ) 한국축산학회 1973 한국축산학회지 Vol.15 No.4
The effect of feed restriction during the rearing period on the reproductive performence of a total of 300 pullets from colonial layer line was examined. The rearing treatments, which from at 8 weeks to 21 weeks of age, were A-control (ab lib), B-20% restricted, C-40% restricted and D-low energy ration (ab lib). Feed consumption was checked twice weekly in each control group and the amount of feed for the restricted groups changed accordingly. All groups were full fed during laying period after 21 weeks of age. The birds remained in grower cage until 21 weeks of age whereupon they were again re-randomised within a treatment on transfer to a layer cage shed with three replications each of 25 birds in a completely randomised design. The results obtained were as follows; 1) Mortality was not significantly affected by the rearing treatment in either the rearing phase or laying phase of the experiment. 2) In the body weight at 21 weeks of age, the full fed birds (control) weighted 1.43㎏ while 20% restricted birds averaged 1.24㎏, 40% restricted averaged 1.03㎏ and low energy ration (full fed) averaged 1.27㎏. These differences in the body weight disappeared by the time the birds were 31 weeks of age. 3) Restricting the feed intake from 8 to 21 weeks of age resulted in an overall feed saving of 20 to 40% during rearing period, however there were no differences between treatments in total feed consumption during experimental period(8-72 weeks). 4) In feed conversion, the kilograms feed required to produce a kilograms of eggs were less for the restricted groups. The restricted feeding groups (20% and 40%) were saved feed about 10 to 15% of feed requirement to produce eggs. 5) Feed restricted groups delayed sexual maturity as measured by age at 50% production, by 10 to 26 days depending upon the severity of restriction. 6) Average hen day egg production up to the end of the experiment 72 weeks of age) was 59% for the control, and 60∼62% for the restricted groups. Average hen housed egg production per bird up to the end of the experiment was 194 eggs for control, and 212 for 20% restricted, 209 for 40% restricted and 203 for low energy ration. 7) The egg size was significantly increased in restricted groups relative to control. The difference between restricted groups and control was highly significant for extra large, large and medium egg size. 8) In the economic analysis, relative profit was about 10 to 13% higher fur the restricted groups, compared to the birds on the full fed group.
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