Avaliação nutricional do milho e do sorgo cultivados com diferentes adubos orgânicos para frangos de crescimento lento

Abstract

Four experiments were conducted at the Poultry Sector of the Federal University of Tocantins, Araguaína - TO, with the objective of evaluate corn and sorghum grown in different organic manures on chemical composition, energy values, metabolization coefficients of dry matter (CMAMS) crude protein (CMAPB) and gross energy (CMAEB) and their uses in feed slow growing chickens. On the first experiment, we conducted a essay to determine the apparent metabolizable energy (AME), apparent metabolizable energy corrected for nitrogen balance (AME), the metabolizability coefficients of dry matter (CMAMS), crude protein (CMAPB) and gross energy (CMAEB) of corns (manured with sunn hemp, manured with pearl millet, manured with humus and without manuring), using the method of total excreta collection. The II experiment, evaluated the use of corns (reference ration with commercial corn, ration with corn without manuring, ration with corn manured with humus, ration with corn manured with pearl millet and ration with corn manured with sunn hemp) in feed for slow-growing broilers the period of one to 20 days of age, about the performance variables (weight gain, feed intake, feed conversion). In the experiment III, we performed a essay to determine the AME, AME, CMAMS, CMAPB and CMAEB of sorghums (manured with sunn hemp, manured with pearl millet, manured with humus and without manuring) using the total excreta collection method. The IV experiment, evaluated the utilization of sorghums (reference ration with commercial corn, ration with sorghum manured with sunn hemp, ration with sorghum manured with pearl millet, ration with sorghum manured with humus, and ration with sorghum without manuring) in feed for slow-growing broilers the period of one to 28 days of age, about the performance variables (weight gain, feed intake, feed conversion). In the experiment I the values of AME and AME of corns manured with sunn hemp, pearl millet, humus and without manuring were: 3246Kcal/kg and 3239kcal/kg; 2965 kcal/kg and 2954kcal/kg; 2909kcal/kg and 2877kcal/kg; 3265kcal/kg and 3201kcal/kg, respectively and the apparent metabolizability coefficients were 89.75% for MS, 66.88% of CP, 88.5% in EB; 84.38% for MS, 58.73% for PB, 81.4% for EB; 80.38% for MS, 53.45% for PB, 78.95% for EB; 89.48% for MS, 68.95% to PB and 87.85% for EB, respectively. In the second experiment, it was observed that the utilization of the corns grown with different manuring and without manuring affected (P> 0.05) the performance characteristics. The treatments that have made use of corn with different manurings and commercial corn did not differ and showed the best results in relation to treatment with corn without manuring. In the experiment III, the values determined of AME and AMEn of sorghums manured with sunn hemp, pearl millet, sorghum and humus without manuring were: 2894Kcal/kg and 2881 kcal/kg; 2736 kcal/kg and 2675 kcal/kg; 2727 kcal/kg and 2694 kcal/kg; 2994 kcal/kg and 2959 kcal/kg, respectively and the apparent metabolizability coefficients were: 76.04% for MS, 42.01% of CP, 75.25% for EB 77.50% DM, 50.77% for PB, 75.95% for EB; 77.62% for MS, 46.39% for PB, 75.54% for EB; 75.83% for MS, 39.53% to PB, 74.71% for EB, respectively. In the IV experiment, it was observed that the utilization of cultivated sorghums with different manurings and without manuring did not affect (P> 0.05) the performance characteristics. The green manuring with Crotalaria and pearl millet, followed by use humus of cattle manure are alternatives that can be utilized in the cultivation of corn and sorghum, they provide grains with nutritional composition, energetic values and metabolizability coefficients appropriate to the performance of slow-growing broiler 1 to 20 days of age fed corn and 1 to 28 days of age fed sorghum.