Processamento de grãos de milho flint e sua substituição por polpa cítrica em dietas para tourinhos Nelore terminados em confinamento

Autor: Gouvêa, Vinícius Nunes de
Jazyk: portugalština
Rok vydání: 2012
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Druh dokumentu: Dissertação de Mestrado
Popis: O objetivo do presente estudo foi avaliar os efeitos de métodos de processamentos de grãos de milho flint (floculação (MF), 310 g/L x moagem (MM), 1,3 mm de tamanho médio de partícula - TMP) e sua substituição parcial por polpa cítrica peletizada (0, 25, 50 e 75% da MS da dieta) no desempenho e nas características da carcaça de tourinhos terminados em confinamento. Foram utilizados 216 tourinhos da raça Nelore, com peso inicial de 350 kg, alojados em 40 baias coletivas, distribuídos um delineamento em blocos casualizados em arranjo fatorial 2 x 4, perfazendo um total de oito tratamentos (MM0, MM25, MM50, MM75, MF0, MF25, MF50, MF75). O experimento teve duração de 103 dias, após a adaptação dos animais às dietas experimentais, que apresentaram na composição da MS, 12% de bagaço de cana de açúcar in natura (BIN) e 88% de concentrado. Os dados foram analisados através do procedimento MIXED do pacote estatístico SAS, sendo a baia considerada a unidade experimental. Houve interação significativa (P0,05) a IMS dos animais, entretanto, houve efeito positivo (P
The effects of flint corn processing (steam flaking, 310 g/l vs. gridding, 1.3 mm GMD) and the partial replacement of corn with citrus pulp (0, 25, 50 or 75%) in feedlot diets were evaluated. A total of 216 Nellore bulls (IBW 350 kg) were allotted to 40 pens and used in a randomized complete block design with a 2 × 4 factorial arrangement of treatments (SF100:CP0; SF75:CP25; SF50:CP50; SF25:CP75; GC100:CP0; GC75:CP25; GC50:CP50; GC25:CP75) for 103-d. The diets contained (% DM) 12% sugar cane bagasse and 88% concentrate. Data was analyzed using mixed procedure of SAS with pens as experimental units. For DMI, ADG, G/F and observed NEg the effects of grain processing, the effects of citrus pulp inclusion in the diets and interactions were significant (P < 0.01). All the diets containing SFC presented less DMI than the GC75:CP25 and the GC50:CP50 diets. Citrus pulp had no effect on DMI of the SFC diets, however it increased DMI when it replaced up to 50% of the GC. Inclusion of CP decreased ADG in the SFC diets (1.80; 1.52; 1.70; 1.58 kg.head-1 and it increased ADG in the GC diets (1.60; 1.74; 1.85; 1.70 kg.head- 1. The greatest G/F was observed for Nellore cattle fed the SF100:CP0 diet followed by the SF50:CP50 diet. Inclusion of citrus pulp decreased G/F of cattle fed SFC (0.222; 0.190; 0.200; 0.184) and had no effect for cattle fed GC diets (0.180; 0.176; 0.180; 0.186). Diet NEg was greater for SFC diets (1.73; 1.51; 1.56; 1.45 Mcal kg.DM-1 than for GC diets (1.42; 1.37; 1.39; 1.44 Mcal kg.DM-1, with a negative effect of CP in the SFC diets. Fat thickness was greater for GC than for SFC diets (4.4 mm vs. 5.0 mm). When CP replaced up to 50% of corn in the diets fecal starch was less for SFC diets than for GC diets (2.0% vs. 9.3%). In conclusion, SFC increases diet NEg for Nellore cattle fed high concentrate diets compared to ground corn. Citrus pulp decreases NEg in SFC diets and has no negative effects on ground corn diets NEg for Nellore cattle.
Databáze: Networked Digital Library of Theses & Dissertations
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