fontes de energia em suplementos múltiplos para recria de novilhos mestiços em pastejo durante o período de transição seca/águas: desempenho produtivo e características nutricionais energy sources in multiple supplements for growing crossbred steers on pastureduring the dry to rainy seasons: performance and nutritional characteristics

Clicks: 353
ID: 169958
2009
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Abstract
Avaliaram-se os efeitos da utilização de fontes amiláceas e fibrosas de energia em suplementos múltiplos sobre o desempenho e as características nutricionais de novilhos mestiços em recria em pastagem de Brachiaria decumbens durante o período de transição seca/águas. A área experimental constituiu-se de 5 piquetes de 2,0 ha, com disponibilidade média de matéria seca (MS) de 4.309,4 kg/ha. Utilizaram-se 24 novilhos mestiços (Holandês × Zebu), castrados, com aproximadamente 24 meses de idade e peso vivo inicial de 314,46 kg. A cada animal destinou-se, casualmente, um dos cinco tratamentos: mistura mineral à vontade, grão de milheto ou grão de milho como fontes amiláceas de energia; polpa cítrica ou farelo de trigo como fontes fibrosas. Às fontes de energia foram adicionados mistura mineral, farelo de algodão e uréia para comporem suplementos com 30% de PB, com base na matéria natural, fornecidos em 1,5 kg/animal/dia. No grupo controle, não houve efeito da suplementação sobre o ganho médio diário. O ganho médio diário obtido com as fontes fibrosas foi 17,43% superior ao obtido com as fontes amiláceas. Os consumos de matéria seca e orgânica (kg/animal/dia e g/kg de peso vivo) pelos animais do grupo controle foram inferiores, assim como os consumos (kg/animal/dia) de PB, CNF, EE, FDNi e NDT. As digestibilidades aparentes totais de PB e CNF foram mais baixas nos animais que receberam somente mistura mineral. Animais do grupo controle apresentaram menores teores de nitrogênio uréico sérico e urinário. Suplementos com fontes fibrosas de alta digestibilidade em associação a uréia promovem ganhos de peso superiores àqueles formulados com fontes amiláceas e uréia. A suplementação múltipla no período de transição seca/águas, fornecida no nível de 0,4% do peso vivo, não afeta a digestibilidade da FDNcp, independentemente da fonte de energia.
This study was conduced to evaluate the energy sources, rich in starch or fiber in multiples supplements on performance and nutritional characteristics of finishing crossbred steers in the dry/rainy transition season, grazing Brachiaria decumbens Stapf. The experimental area was divided into 5 paddocks with 2.0 ha each, with dry matter availability of 4.309,4 kg/ha. Twenty-four castrated crossbred steers were used, initially 24 month old and 314.46 kg. For each animal, one of the five treatments was randomly applied: mineral mixture ad libitum, pearl millet grain or corn grain, as starchy energy sources, citrus pulp or wheat bran, as fibrous energy sources. To the different energy sources, the following were added: mineral mixture, cotton seed meal and urea, so that they composed supplements with 30% of crude protein based on the natural matter, supplied at the level of 1.5 kg/animal/day. In relation to control group, significant effect of the supplementation on the diary gain was not verified. The average daily gain obtained with the fibrous sources was 17.43% higher than that obtained with the starchy sources. The dry matter (DM), organic matter, non-fibrous carbohydrates (NFC), crude protein (CP), ether extract, digestible DM, total digestible nutrients and neutral detergent fiber (NDF) indigestible intakes (kg/animal/day) was higher for supplemented animals in relation to the control group. CP and NFC total apparent digestibility were lower for animals that received only MM. Excretion of urea by urine, and the urea plasmatic level were lower for animals fed MM only. Multiple supplements with high digestible fiber sources in association with urea promoted better performance to the animals than that formulated with starchy sources and urea. The supplementation in the dry/rainy season, in 0.4% of the BW do not affect the NDF digestibility, regardless of the energy source.
Reference Key
nascimento2009revistafontes Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Michele Lopes do Nascimento;Mário Fonseca Paulino;Edenio Detmann;Sebastião de Campos Valadares Filho;Marlos Oliveira Porto;Maykel Franklin Lima Sales
Journal european journal of lipid science and technology
Year 2009
DOI
10.1590/S1516-35982009000600021
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000600021
Keywords
digestibility intake

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