Qualidade da carne de suínos submetidos a dietas com diferentes nivéis de ractopamina

The experiment was conducted in the Department of Animal Science of the Federal University of Lavras. The objectives were to obtain chemical, physical and sensory charac- teristics of pork meat receiving different levels of ractopamine in the diet, in the period of 28 days. Sixty hybrids pigs were used, being 30 castrated males and 30 females, selected for high deposition of lean meat, with initial weight of 84,27±2,26 kg. The experimental design was a completely randomized block design with six treatments (0, 3, 6, 9, 12 and 15 ppm of ractopamine) and 6 repetitions with the experimental plot represented by a male and a female. The addition of ractopamine in the diets of the pigs at the levels tested improved the chemical composition both for the loin as for the cup, contributing to greater protein deposition and a lower percentage of lipids in the cuts. In physical characteristics the highest levels of ractopamine agreed to texture and changed the color, in addition to the acceptance by consumers. Already in relation to oxidative stability, both for the loins stored under refrigeration as under freezing, the addition of ractopamine diets for pigs in the finishing phase helped in the prevention of lipid oxidation.O experimento foi conduzido no Departamen- to de Zootecnia da Universidade Federal de Lavras com o objetivo de avaliar características químicas, físicas e sensoriais da carne de suínos recebendo diferentes níveis de ractopamina na dieta, no período de 28 dias. Foram utilizados 72 suínos híbridos, sendo 30 machos castrados e 30 fêmeas, selecionados para alta deposição de carne, com peso inicial de 84,27±2,26 kg. O delineamento experimental foi em bloco casualizado, com 6 tratamentos (0, 3, 6, 9, 12 e 15 ppm de ractopamina) e 6 repetições, com a parcela experimental repre- sentada por 1 macho e 1 fêmea. A adição de ractopamina nas dietas dos suínos nos níveis testados melhorou a composição química tanto do lombo quanto da copa, contribuindo para uma maior deposição proteica e uma menor porcen- tagem de lipídeos nos cortes. Nas características físicas os níveis mais altos de ractopamina comprometeram a textura e alteraram a cor, além da aceitação pelos consumidores. Já em relação à estabilidade oxidativa, tanto para os lombos armazenados sob resfriamento quanto sob congelamento, a adição de ractopamina às dietas de suínos em terminação auxiliou na prevenção da oxidação lipídica

Aproveitamento do resíduo do café na alimentação de tilápia do nilo

This work evaluated different ways to include residues from coffee in Nile tilapia ration. Three assays were conducted: 1-rations chemical composition; 2-digestibility and 3-tilapia perfor- mance fed with different ways to include residues of coffee on ration. The following treatments were tested: T1-basal ration; T2-stove pre-dried coffe residue ration; T3-ration with residue from coffee maintained under aerobic conditions added serum of milk and nolasses; T4-ration with acid ensilage of residue from coffee with formic acid; T7-ration with ensilage of residue from coffee with serum of milk. Those residues replaced 30% of the basal ration. The physical form of the ration was pelleted. The treatment T5 resulted in greater weight gain and feed consumption and lesser feed conversion. The treatments T1 and T2 did not defer between itself presenting close values to the T5. The treatments T6 and T7 presented lesser weight gain and ration consumption and greater feed conversion.O trabalho propôs avaliar formas de inclusão de resíduos de café na ração para alimentação de tilápia do Nilo. Foram realizados três ensaios: 1-composição química das rações; 2-digestibilidade das rações e 3-desempenho de tilápias recebendo as rações contendo diferentes formas de inclusão dos resíduos de café. Foram testados os seguintes tratamentos: T1-ração referência; T2-ração com resíduo de café pré-seco em estufa; T3-ração com resíduo de café mantido em condições aeróbicas acrescido de soro de leite e melaço; T4- ração com silagem ácida de resíduo de café com ácido fórmico; T5-ração com silagem de resíduo de café com soro de leite. Esses resíduos substituíram 30% da ração referência, sendo as rações posteriormente peletizadas. O tratamento T5 foi o que resultou em maior ganho de peso e consumo de ração. Os tratamentos T1 e T2 não diferiram entre si, apresentando valores próximos ao T5. Os tratamentos T6 e T7 apresentaram menor ganho de peso e consumo de ração e ainda maior conversão alimentar

Effect of ractopamine on the chemical and physical characteristics of pacu(Piaractus mesopotamicus) steaks

The objective was to evaluate the use of ractopamine (RAC) in the diet for pacu (Piaractus mesopotaminus) in the finishing phase on some quality parameters of the fillets. Thirty-five animals weighing 0.868±0.168kg were distributed in a completely randomised design with five treatments (0.0 - control; 11.25, 22.50, 33.75 and 45 ppm of RAC) and seven replicates with two fillets obtained from the same animal. The diets were isocaloric and isoprotein and experimental time was 90 days. RAC did not affect (P>0.05) the initial pH or ph after 24 hours of the fillets. Compared to the control, RAC increased (P<0.05) the moisture content of the fillets in natura and lipid oxidation of samples stored for 12 days in the refrigerator or freezer for 60 days. The RAC in 11.25 ppm reduced (P<0.05) the lipid content, while 45 ppm reduced (P<0.05) the crude protein in the fillets. Considering only RAC, there was a linear increase (P<0.05) in the lipid content (P<0.05) and a linear reduction in crude protein and weight loss after cooking the fillets. There was a quadratic effect (P<0.05) on the ash content, weight loss and lipid oxidation in fillets stored in the refrigerator or freezer. A RAC dose of 33.75 ppm resulted in a lower lipid oxidation index. In conclusion, ractopamine at 11.25 ppm is effective for reducing the fat content in fillets of pacu, although it increases the formation of peroxides in samples kept in the freezer for longer than 60 days. At 33.75 ppm, ractopamine is effective in reducing the effect of oxidation during storage in the refrigerator or freezer