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| Author(s): |
Andre Alves de Souza
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2002-03-15 |
| Advisor: | Celso Boin |
| Abstract | |
This study has evaluated the effects of energetic-proteic supplementation in animal performance, ruminal fermentation, plasma urea and carcass characteristics of Nellore cattle in pasture. A hundred and twenty eight animals have been evaluated. The statistical design has been a randomized block with four treatments and four replications. The treatments were: Control = Brachiaria brizanta + mineral supplement; Leucena = Brachiaria brizanta + protein bank (Leucaena leucocephala) + 2 Kg citrus pulp + 2 Kg Wet com gluten feed + mineral supplement (animal/day); Supl1 = = Brachiaria brizanta pasture + 2 Kg citrus pulp + 2 Kg Wet com gluten feed + 0,5 Kg soybean meal + mineral supplement (animal/day); Supl2 = Brachiaria brizanta pasture + 2 Kg citrus pulp + 2 Kg Wet com gluten feed + 1 Kg soybean meal + mineral supplement (animal/day). Supplementation with 0,3; 0,6 and 0,7% of livewheight hasn't altered the fermentative characteristics of the rumen. The supplementation provides higher daily weight gain to the supplemented animals for the total experimental period. We have noticed interaction time x treatment and in the first period higher gains for the Supl1 e 2 have been observed. In the second and third periods, the gains have been higher for leucena, Supl1 e 2. There was no difference in daily gain for all treatments in the fourth experimental period, probably because the initial rains and consequently higher quality and disponibility of the forage. In the final period, the supplements leucena and Supl1 have been higher than control and Supl.2. It has been observed higher carcass yield for the supplemented animals of the treatments leucena, Supl.1 e 2. The results of backfat have been like the yield carcass results, but when the values of backfat were related with 100 Kg of carcass, no difference have been observed. The energetic-proteic supplementation provides the reduction of the age of slaughter, because it elevates in growth velocity (AU) | |