O uso de aditivos em dietas para leitões desmamados na suinocultura industrial tem como intuito diminuir o uso de antimicrobianos na produção suinícola, além de melhorar a saúde intestinal e desempenho produtivo dos animais. Portanto, neste estudo teve-se como objetivo elaborar uma revisão bibliográfica sobre os principais aditivos utilizados em dietas para leitões na fase de creche. Os aditivos atuam como probióticos e prebióticos, sendo estes essenciais na fase de creche devido aos desafios sanitários que os animais são submetidos, visto que promovem benefícios para a saúde dos animais. O sucesso na utilização dos aditivos na fase de creche está relacionado com a dosagem a ser utilizada e principalmente com o nível de desafio sanitário ao qual os animais são expostos. Alguns resultados de pesquisas nessa área indicam que os aditivos são mais eficientes em animais mais desafiados, o que justifica a variabilidade de resultados encontrados na literatura. Alguns estudos demonstram que o mecanismo de ação dos aditivos pode reduzir o uso de antimicrobianos nas dietas de leitões em fase de creche, além de agregar melhores resultados de desempenho zootécnico. De acordo com a revisão realizada, conclui-se que a utilização de aditivos em dietas de leitões em período de creche, pode garantir melhores índices produtivos dos animais, além de se apresentarem como boas alternativas frente ao uso de antibióticos.
A maior parte dos pequenos produtores rurais no Brasil tem em atividades de criação de suínos caipira uma alternativa para obtenção de alimento de alto valor nutritivo e de rentabilidade. O objetivo deste trabalho foi implantar e desenvolver um sistema de produção extensivo sustentável de suínos, nos centros de irradiação e manejo agroecológico nas áreas de assentamentos de reforma agrária da região do Norte de Minas Gerais, possibilitando ampliar a fonte de renda dos assentados e maior difusão e valorização da raça suína nativa. Para início do projeto de extensão foi realizado o contato com os agricultores e exposição do projeto, identificação dos agentes multiplicadores e formação de núcleos familiares, após, implantada uma granja núcleo de manejo agroecológico de suínos nos assentamentos no município de Montes Claros utilizando animais puros da raça Piau. Foi realizado um levantamento dos fatores limitantes e potenciais junto à comunidade, com o objetivo de se consolidar um modelo de suínos que melhor se adapta às especificidades locais. Foi realizada a tabulação de dados de um ano de coleta referente aos índices zootécnicos dos animais. Foram obtidos 8,6 leitões nascidos vivos/parto/porca; 6,47 leitões desmamados/parto/porca no projeto, índices estes que são superiores aos índices zootécnicos obtidos na suinocultura de manejo tradicional, utilizando raças nacionais. Com a implantação deste sistema de produção sustentável e agroecológico nas áreas de assentamentos de reforma agrária da região do Norte de Minas foi possível obter melhores dados produtivos da produção, além de maior difusão e valorização da raça suína nativa.
The dietary inclusion of feed additives to improve the carcass characteristics of the final product is of great importance for the pork production chain. The aim of our study was to evaluate the effects of the association of ractopamine (RAC) and conjugated linoleic acid (CLA) on the performance traits of finishing pigs during the last 26 days prior to slaughter. In total, 810 commercial hybrid barrows were used. Animals were distributed among treatments according to a randomised block design in a 3 × 3 factorial arrangement, with three RAC levels (0, 5 or 10 ppm) and three CLA levels (0, 0.3 or 0.6%). Pigs fed the diet with 5 ppm RAC had higher average daily feed intake (ADFI) (2.83 kg; P < 0.05) when compared with those fed 10 ppm RAC and the control diet (2.75 and 2.74 kg, respectively). Lower ADFI values (P < 0.01) were observed with the diets containing CLA compared with the control diet with no CLA (2.73 and 2.75 v. 2.85 kg/day, respectively). The average daily weight gain of pigs fed 5 and 10 ppm RAC was +148 and +173 g/dayhigher (P < 0.001), respectively, than those fed the control diet. Dietary RAC levels influenced (P < 0.001) feed conversion ratio (FCR), which was reduced as RAC levels increased, with the pigs fed 10, 5 and 0 ppm RAC presenting FCR values of 2.57, 2.71 and 3.05, respectively. FCR also improved (P < 0.05) with the inclusion of 0.6% CLA relative to the control diet (2.70 v. 2.84, respectively). There was a significant interaction between CLA × RAC levels (P < 0.01) for final BW, loin eye area (LEA) (P < 0.05) and backfat thickness (BT) (P < 0.05). The treatments containing 10 ppm RAC + 0.6% or 0.3% CLA increased LEA and reduced BT. In conclusion, the level of 10 ppm inclusion of RAC increased the overall performance parameters of pigs and therefore improved production efficiency. The combined use of RAC and CLA promoted a lower feed conversion ratio as well as better quantitative carcass traits, as demonstrated by the higher LEA and lower BT. The dietary inclusion of CLA at 0.3% improved feed efficiency, however, without affecting LEA or BT yields.
Improvements in sow productivity have raised questions regarding dietary vitamin D recommendations. The present study aimed to evaluate the effects of the housing system with access to sunlight exposure and supplementation of 25‐hydroxicholecalciferol on performance and serum levels of 25(OH)D3 in sows during gestation and lactation. Sows were distributed in an experimental design with two housing systems: gestation crates or gestation free‐range system with external area for sunlight exposure; and two diets: 0 or 50 μg of 25‐hydroxicholecalciferol kg−1. The use of 25‐hydroxicholecalciferol tended (P = 0.052) to improve total born and influenced (P = 0.046) on number of born alive. Litter weight at birth was also increased (P = 0.01) by 25‐hydroxicholecalciferol supplementation; 25‐hydroxicholecalciferol supplementation and housing system (free‐range with sunlight exposure) tended to increase weaning weight (P = 0.07) and litter daily gain (P = 0.051) during lactation. Exposure to sunlight and 25‐hydroxicholecalciferol supplementation increased 25(OH)D3 serum levels when compared with control treatment during gestation (136.95 vs. 113.92 ng mL−1; P = 0.035) and lactation (120.29 vs. 88.93 ng mL−1; P = 0.026). In conclusion, the association of 25‐hydroxicholecalciferol supplementation with exposure to sunlight during gestation improved significantly 25(OH)D3 serum levels and consequently performance traits in gestation and lactation.
This study aimed to characterize the helminthiasis and anthelminthic effectiveness in calf herds raised in a hot semi-arid area. Sixty (60) cattle farms from the northern area of Minas Gerais, Brazilian sertão, were categorized by semi-structured questionnaires. It was also performed the fecal egg counts (FEC) reduction test to analyze the profile of anthelminthic resistance in eight herds. The study selected groups of at least 10 homogeneous calves with FEC ≥ 150 per treatment. After 12 h of fast, calf groups were treated with albendazole, levamisole, ivermectin, doramectin or abamectin, except the control groups (untreated). It was collected feces before treatments and 14 d later larvae genera of nematodes were identified after coproculture. Extensive grazing was the predominant creation system for beef calves, worming was employed every 6 mo in 64 % of the farms and macrocyclic lactones was the most frequently used anthelminthic group. The anthelminthic efficacy varied from 62 to 98.9 %. The resistance profile to ivermectin, levaminosole, albendazole and (or) doramectin verified in this research is alarming as the genus Haemonchus was the most frequent one before and after the treatments. It was detected variations in the creation systems, in control practices and in anthelminthic susceptibility profiles between herds. Therefore, this work emphasize the importance of using strategic control with FEC reduction test for choice of anthelminthic and the encouragement of practices of alternative control.
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