Comparison between "theoretical" and "measured" values of true digestibility of protein and amino acids of diets in cockerels

Английский. The effect of different mixtures of 4 feedstuffs (corn, soybean meal, dehulled and whole rapeseed meals) in the diets on theoretical and measured values of true digestibility of protein (TDP) and amino acids (TDAA) were investigated in adults cockerels. Six experimental diets were formulated. Diet 1, 2, 3, and 4 contained 15, 17, 19 and 22 percent of crude protein (CP), respectively. Diets 5 and 6 were as diets 4 and 1 respectively but were diluted with starch so as to obtain a CP content of about 11 percent. These last diets were formulated in order to study the effect of protein dilution on TDP and TDAA when the same feedstuffs were used in the diet. In order to obtain the measured values of TDP and TDAA, thirty-six adult cockerels (Isa Brown) were fasted for 24 hours and the forced-fed with a moistened diet composed of 50 percent water and 50 percent feed. The theoretical values were calculated from the individual digestibility value of each feedstuff tested. The result of the current experiment indicated that there was no significant difference (P0.05) between theoretical and measured values for TDP in the six diets tested. However, there were significant differences (P0.01) between theoretical and measured values of TDAA where measured theoretical for the major part of amino acids. Protein dilution had no significant effect on TDP and TDAA values

индонезийский. Penelitian bertujuan untuk mengetahui pengaruh campuran empat bahan pakan (jagung, bungkil kedelai dan dua macam bungkil rapeseed) di dalam ransum terhadap nilai kecernaan rill protein (TDP) dan asam amino (TDAA) yang didapat secara teori dan terukur pada ayam jantan dewasa. Empat ransum penelitian yang digunakan adalah ransum 1, 2, 3, dan 4 yang mengandung berturut-turut 15, 17, 19 dan 22 persen protein kasar, sedangkan ransum 5 dan 6 dibuat dari ransum 4 dan 1 yang telah dicampur dengan pati sehingga kandungan protein kasarnya menjadi 11 persen. Kedua ransum yang terakhir ini digunakan untuk mengetahui pengaruh penurunan kadar protein ransum terhadap nilai TDP dan TDAA apabila menggunakan bahan pakan yang sama. Untuk mendapatkan nilai TDP dan TDAA yang terukur, tiga puluh enam ekor ayam jantan dewasa strain Isa Brown dipuasakan selama 24 jam, dan kemudian diloloh dengan menggunakan metode pelolongan basah (campuran 50 persen air dan 50 persen pakan). Untuk TDP dan TDAA teori didapat dari kalkulasi dari nilai kecernaan individu masing-masing bahan pakan yang digunakan. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang tidak nyata antara nilai TDP teori dan yang terukur untuk 6 macam ransum perlakuan. Nilai TDAA terukur lebih kecil (P0,01) dibanding nilai TDAA teori untuk sebagian besar asam amino. Kadar protein ransum berpengaruh tidak nyata terhadap nilai TDP dan TDAA ayam jantan dewasa