닭에 있어서 계분의 사료가치에 관한 연구 ( 제1보 ) = Study on the Nutritive Value of Dehydrated Poultry Waste in Poultry Rations ( 1 )

다국어 초록 (Multilingual Abstract)

Two experiments were carried out to determine the chemical composition of dehydrated poultry waste(D.P.W) according to its collecting time after excretion and to determine the nutritive value of D.P.W. as a feed of laying hen. The results were summarized as follows: 1. Protein content of D.P.W. is gradually decreased as the time passes after excretion, the excreta collected within 24 hour showed 31.02% of protein, and the one within 48 hour shoved 16.60%. There was a wide variation in the amount of non-protein nitrogen(NPN), while the true protein is fairly constant. Above 50% of the nitrogen in D.P.W. occurs in the form of NPN. 2. The nitrogen content of D.P.W. was not affected by the dietary protein level, but seemed to be influences significantly by the age of chicken. The highest nitrogen value was obtained from laying hen, although their dietary nitrogen was lower than that of growing chick. 3. 10% D.P.W-A ration showed highest egg production among the treatments and feed efficiency was substantially reduced when 20% of the D.P.W-B was included in the ration which reflected its low metabolizable energy value. The result of this experiment demonstrates that the inclusion of 10% D.P.W. did not interfere with the egg production. 4. There were no differences in egg weight, shell thickness and haugh unit among the treatments. This result proves that the inclusion of D.P.W. did not interfere with egg quality.