산란계 육성기 계란급이가 초기 산란 특징에 미치는 영향

This experiment was conducted to investigate the effect of restricted feeding to pullet on growth and laying Performance, egg qualify and endocrine Profile in brown layers. 1,080 brown-layer chicks divided to three diet treatments, conventional diet and two restricted diets, for 70 weeks. Conventional diets(C) was formulated by NRC recommendation, and one of restricted diet started from seven to seventeen week of age(T1), and another started from twelve to seventeen(T2) with adjusted eighty percentage amount of conventional diet. Body weight decreased with starting restriction of feeding comparing to the C(P＜0.05), but reached to similar weight in all treatments at twenty week regardless restriction. All of birds started to lay egg around 1,400 to 1,450gram of body weight though the age was in order of C, T2 and T1. Overall e99 Production was the highest in T1 (P＜0.05) and there were not difference in C and T2. Average egg weight also showed similar to the tendency of egg production. Feed intake was higher in T1 during maximum production(P＜0.05), but there were not difference in all treatments after the peak. Overall feed conversion ratio improved in T1 compared to C and T1(p＜0.05). Restriction feeding in rearing period could be beneficial to improve egg productivity and to decrease feed cost.

육성기 제한급이가 육성기 발육특성 및 기초 산란형태에 미치는 영향을 규명하기 위하여 갈색 산란계 1,080수를 공시하여 24주간 사양시험을 실시하였다. C는 자유채식을 시켰으며, T1은 6∼12주령까지 대조구 70％, 18주령까지 75％ 수준으로 급여하였고, T2는 12∼18주령까지 T1과 동일하게 급여하였다. 18주령 체중은 T1이 가장 낮게 나타났고 C와 T2는 비슷하게 나타났으나 20주령 체중은 처리간 모두 비슷하게 나타났다. 18주령까지 사료섭취량은 T1이 가장 적었으며 C가 가장 많았다. 초산일령은 C가 가장 빨랐지만 90％ 산란일정은 T1이 가장 빠른 것으로 나타났다. 연란과 쌍란 발생률은 C가 가장 많았고 T1이 가장 적은 것으로 나타났다. 이상과 같은 결과에서 육성 초기 사료 제한급이는 육성기 사료섭취량과 산란초기 연란 및 쌍란 발생률을 감소시키며 급격한 산란증가를 유도하는 것으로 나타났다.