Effects of dietary yeast mannan-rich fraction supplementation on growth performance, intestinal morphology, and lymphoid tissue characteristics in weaned piglets challenged with Escherichia Coli F4.

We evaluated the effects of supplementing yeast mannan-reach-fraction on growth performance, jejunal morphology and lymphoid tissue characteristics in weaned piglets challenged with E. Coli F4. A total of 20 crossbred piglets were used. At weaning, piglets were assigned at random to one of four groups: piglets challenged and fed the basal diet supplemented with yeast mannan-rich fraction (C-MRF, n = 5); piglets challenged and fed the basal diet (C-BD, n = 5); piglets not challenged and fed the basal diet supplemented with yeast mannan-rich fraction (NC-MRF, n = 5), and piglets not challenged and fed the basal diet (NC-BD). Each dietary treatment had five replicates. On days 4, 5 and 10, piglets were orally challenged with 108 CFU/mL of E. Coli F4. C-MRF piglets had higher BW (p = 0.002; interactive effect) than C-BD piglets. C-MRF piglets had higher (p = 0.02; interactive effect) ADG in comparison with C-BD piglets. C-MRF piglets had higher (p = 0.04; interactive effect) ADFI than C-BD piglets. The diameter of lymphoid follicles was larger (p = 0.010; interactive effect) in the tonsils of C-MRF piglets than C-BD piglets. Lymphoid cells proliferation was greater in the mesenteric lymphnodes and ileum (p = 0.04 and p = 0.03, respectively) of C-MRF piglets. A reduction (p > 0.05) in E. Coli adherence in the ileum of piglets fed MRF was observed. In conclusion, the results of the present study demonstrate that dietary yeast mannan-rich fraction supplementation was effective in protecting weaned piglets against E. Coli F4 challenge.

Desempenho e comportamento de suínos em fase de terminação submetidos a diferentes programas de luz

SUMMARY The aim of this study was to evaluate the use of lighting programs on performance, plasma concentration of melatonin and behavior of finishing pigs. The experiment was conducted in the pig farming sector UFLA, using 32 pigs in the finishing phase, for 48 days. The animals were housed in groups of two in each pen (experimental unit), distributed in a randomized block design, according to the initial weight. Four light periods were used (treatments): T1: natural light (LN); T2: 15 hours of light and dark by day nine (15L: 9E); T3: 19 hours light per day (19L: 5E); T4: 23 hours of light per day (23L: 1D). The variables analyzed were the performance (average daily feed consumption, average daily gain weight and feed conversion), the plasma concentrations of melatonin and the behavior (drinking, sniffing, leisure and eating). The change in photoperiod did not affect performance or melatonin concentration in pigs. The behavioral variables "digging", "eating", "drinking", did not differ in any of the periods studied, but leisure behavior was more occurring to the pigs receiving 15 hours of light. The increase in photoperiod showed no significant changes in performance or behavior of the animals.

RESUMO Objetivou-se com esse trabalho avaliar o uso de programas de luz sobre o desempenho, concentração plasmática de melatonina e comportamento de suínos em fase de terminação. O experimento foi conduzido no setor de suinocultura da UFLA, utilizando-se 32 suínos em fase de terminação, por 48 dias. Os animais foram alojados em grupos de dois em cada baia (unidade experimental), distribuídos em delineamento em blocos casualizados, de acordo com o peso inicial com quatro tratamentos e quatro blocos. Foram utilizados quatro programas de luz (tratamentos), sendo T1: luz natural (LN); T2: 15 horas de luz e nove de escuro por dia (15L: 9E); T3: 19 horas de luz por dia (19L: 5E); T4: 23 horas de luz por dia (23L: 1E). As variáveis analisadas foram o desempenho (consumo de ração médio diário, ganho de peso médio diário e conversão alimentar), concentração plasmática de melatonina e o comportamento (bebendo, fuçando, ócio e comendo). A alteração no fotoperíodo não alterou o desempenho ou a concentração plasmática de melatonina nos suínos. As variáveis comportamentais fuçando, comendo, bebendo, não diferiram em nenhum dos períodos estudados, porém o comportamento ócio foi mais ocorrente nos suínos que receberam 15 horas de luz. O aumento no fotoperíodo não permitiu expressivas alterações de desempenho ou de comportamento dos animais.

Desempenho e comportamento de suínos em fase de terminação submetidos a diferentes programas de luz

SUMMARY The aim of this study was to evaluate the use of lighting programs on performance, plasma concentration of melatonin and behavior of finishing pigs. The experiment was conducted in the pig farming sector UFLA, using 32 pigs in the finishing phase, for 48 days. The animals were housed in groups of two in each pen (experimental unit), distributed in a randomized block design, according to the initial weight. Four light periods were used (treatments): T1: natural light (LN); T2: 15 hours of light and dark by day nine (15L: 9E); T3: 19 hours light per day (19L: 5E); T4: 23 hours of light per day (23L: 1D). The variables analyzed were the performance (average daily feed consumption, average daily gain weight and feed conversion), the plasma concentrations of melatonin and the behavior (drinking, sniffing, leisure and eating). The change in photoperiod did not affect performance or melatonin concentration in pigs. The behavioral variables "digging", "eating", "drinking", did not differ in any of the periods studied, but leisure behavior was more occurring to the pigs receiving 15 hours of light. The increase in photoperiod showed no significant changes in performance or behavior of the animals.

RESUMO Objetivou-se com esse trabalho avaliar o uso de programas de luz sobre o desempenho, concentração plasmática de melatonina e comportamento de suínos em fase de terminação. O experimento foi conduzido no setor de suinocultura da UFLA, utilizando-se 32 suínos em fase de terminação, por 48 dias. Os animais foram alojados em grupos de dois em cada baia (unidade experimental), distribuídos em delineamento em blocos casualizados, de acordo com o peso inicial com quatro tratamentos e quatro blocos. Foram utilizados quatro programas de luz (tratamentos), sendo T1: luz natural (LN); T2: 15 horas de luz e nove de escuro por dia (15L: 9E); T3: 19 horas de luz por dia (19L: 5E); T4: 23 horas de luz por dia (23L: 1E). As variáveis analisadas foram o desempenho (consumo de ração médio diário, ganho de peso médio diário e conversão alimentar), concentração plasmática de melatonina e o comportamento (bebendo, fuçando, ócio e comendo). A alteração no fotoperíodo não alterou o desempenho ou a concentração plasmática de melatonina nos suínos. As variáveis comportamentais fuçando, comendo, bebendo, não diferiram em nenhum dos períodos estudados, porém o comportamento ócio foi mais ocorrente nos suínos que receberam 15 horas de luz. O aumento no fotoperíodo não permitiu expressivas alterações de desempenho ou de comportamento dos animais.

Desempenho e rendimento de carcaça de suínos na fase de terminação, recebendo dietas com diferentes níveis de ractopamina

AbstractThe objective of this study was to evaluate the performance and carcass yield of finishing castrated males and females pigs, supplemented with diets containing different levels of ractopamine. Sixty animals were used, with initial body weight of 84.27 ± 2.26kg, distributed in a randomized block design, consisting of six levels of ractopamine (0; 3; 6; 9; 12 and 15ppm) and five repetitions per treatment. At the end of the trial period, it was evaluated the effect of different levels of ractopamine on the final body weight (FW), average daily feed intake (ADFI), average daily weight gain (ADG), feed conversion (FC) and carcass yield. It was observed a linear increase (P 0,05) in the levels of ractopamine for final weight, as well as for the average daily weight gain. For feed conversion (P 0,05), it was evident a decrease of 25.50% in animals supplemented with 15ppm of ractopamine in the diet. For average daily feed intake and carcass yield there was no significant effect (P>0,05). The supplementation with ractopamine in the diet of finishing castrated males and females pigs, provides greater performance to the animals, improving production yield.

ResumoO objetivo com este trabalho foi avaliar o desempenho e o rendimento de carcaça de suínos na fase de terminação de machos castrados e fêmeas, recebendo dietas contendo diferentes níveis de ractopamina. Foram utilizados 60 animais, com peso inicial de 84,27 ± 2,26kg, aleatoriamente distribuídos para uma das seis dietas experimentais compostas por diferentes níveis de ractopamina (zero; três; seis; nove; 12 e 15ppm) e cinco repetições por tratamento. Ao final do período experimental, foi avaliado o efeito dos diferentes níveis de ractopamina sobre o peso final (PF), consumo de ração médio diário (CRMD), ganho de peso médio diário (GPMD), conversão alimentar (CA) e rendimento de carcaça. Observou-se aumento linear (P 0,05) para peso final e ganho de peso médio diário, à medida que houve aumento dos níveis de ractopamina. Para a conversão alimentar (P 0,05), evidenciou-se decréscimo de 25,50% nos animais que receberam 15ppm de ractopamina na dieta. Para o consumo de ração médio diário e rendimento de carcaça, não foram observados efeitos significativos (P>0,05). A adição de ractopamina na dieta de suínos machos castrados e fêmeas em terminação proporcionou melhor desempenho aos animais, promovendo melhoras nos parâmetros produtivos.

Desempenho e rendimento de carcaça de suínos na fase de terminação, recebendo dietas com diferentes níveis de ractopamina

AbstractThe objective of this study was to evaluate the performance and carcass yield of finishing castrated males and females pigs, supplemented with diets containing different levels of ractopamine. Sixty animals were used, with initial body weight of 84.27 ± 2.26kg, distributed in a randomized block design, consisting of six levels of ractopamine (0; 3; 6; 9; 12 and 15ppm) and five repetitions per treatment. At the end of the trial period, it was evaluated the effect of different levels of ractopamine on the final body weight (FW), average daily feed intake (ADFI), average daily weight gain (ADG), feed conversion (FC) and carcass yield. It was observed a linear increase (P 0,05) in the levels of ractopamine for final weight, as well as for the average daily weight gain. For feed conversion (P 0,05), it was evident a decrease of 25.50% in animals supplemented with 15ppm of ractopamine in the diet. For average daily feed intake and carcass yield there was no significant effect (P>0,05). The supplementation with ractopamine in the diet of finishing castrated males and females pigs, provides greater performance to the animals, improving production yield.

ResumoO objetivo com este trabalho foi avaliar o desempenho e o rendimento de carcaça de suínos na fase de terminação de machos castrados e fêmeas, recebendo dietas contendo diferentes níveis de ractopamina. Foram utilizados 60 animais, com peso inicial de 84,27 ± 2,26kg, aleatoriamente distribuídos para uma das seis dietas experimentais compostas por diferentes níveis de ractopamina (zero; três; seis; nove; 12 e 15ppm) e cinco repetições por tratamento. Ao final do período experimental, foi avaliado o efeito dos diferentes níveis de ractopamina sobre o peso final (PF), consumo de ração médio diário (CRMD), ganho de peso médio diário (GPMD), conversão alimentar (CA) e rendimento de carcaça. Observou-se aumento linear (P 0,05) para peso final e ganho de peso médio diário, à medida que houve aumento dos níveis de ractopamina. Para a conversão alimentar (P 0,05), evidenciou-se decréscimo de 25,50% nos animais que receberam 15ppm de ractopamina na dieta. Para o consumo de ração médio diário e rendimento de carcaça, não foram observados efeitos significativos (P>0,05). A adição de ractopamina na dieta de suínos machos castrados e fêmeas em terminação proporcionou melhor desempenho aos animais, promovendo melhoras nos parâmetros produtivos.

Total cholesterol and its fractions in the blood of finishing pigs fed diets with different levels of canola oil / Total cholesterol and its fractions in the blood of finishing pigs fed diets with different levels of canola oil

Background: Pork is an important source of protein and the most widely consumed meat throughout the world. Besides, search for healthy food over the years has been growing, which has stimulated research to improve animal health and consequently, the quality of the final product offered to consumers. People know that who eats a high-fat diet has greater risk of developing metabolism changes, such as high cholesterol levels and consequently, cardiovascular diseases such as atherosclerosis. Studies focusing handling of these lipid food components, both quantitative and qualitatively, can significantly contribute to increase acceptability of animal products by consumers because it can generate knowledge to produce meat with less cholesterol. Among the different cooking oils that can be used in animal feed, the canola oil has drawn the attention of researchers due to its high unsaturated fatty acid contents. The hypothesis is that canola oil modifies the plasmatic profile of the lipoproteins because -linolenic acid (n-3) interfere the good functioning of LDL cholesterol (LDLc) receptors, i.e. interferes in the cholesterol turnover. Therefore, the aim of this study was to assess the effects of different levels of canola oil as sources of poly-unsaturated fats on modulation of total cholesterol and its fractions in the blood of pigs weighing 70 to 100 kg. Materials, Methods and Resul

Background: Pork is an important source of protein and the most widely consumed meat throughout the world. Besides, search for healthy food over the years has been growing, which has stimulated research to improve animal health and consequently, the quality of the final product offered to consumers. People know that who eats a high-fat diet has greater risk of developing metabolism changes, such as high cholesterol levels and consequently, cardiovascular diseases such as atherosclerosis. Studies focusing handling of these lipid food components, both quantitative and qualitatively, can significantly contribute to increase acceptability of animal products by consumers because it can generate knowledge to produce meat with less cholesterol. Among the different cooking oils that can be used in animal feed, the canola oil has drawn the attention of researchers due to its high unsaturated fatty acid contents. The hypothesis is that canola oil modifies the plasmatic profile of the lipoproteins because -linolenic acid (n-3) interfere the good functioning of LDL cholesterol (LDLc) receptors, i.e. interferes in the cholesterol turnover. Therefore, the aim of this study was to assess the effects of different levels of canola oil as sources of poly-unsaturated fats on modulation of total cholesterol and its fractions in the blood of pigs weighing 70 to 100 kg. Materials, Methods and Resul

Total cholesterol and its fractions in the blood of finishing pigs fed diets with different levels of canola oil / Total cholesterol and its fractions in the blood of finishing pigs fed diets with different levels of canola oil

Background: Pork is an important source of protein and the most widely consumed meat throughout the world. Besides, search for healthy food over the years has been growing, which has stimulated research to improve animal health and consequently, the quality of the final product offered to consumers. People know that who eats a high-fat diet has greater risk of developing metabolism changes, such as high cholesterol levels and consequently, cardiovascular diseases such as atherosclerosis. Studies focusing handling of these lipid food components, both quantitative and qualitatively, can significantly contribute to increase acceptability of animal products by consumers because it can generate knowledge to produce meat with less cholesterol. Among the different cooking oils that can be used in animal feed, the canola oil has drawn the attention of researchers due to its high unsaturated fatty acid contents. The hypothesis is that canola oil modifies the plasmatic profile of the lipoproteins because -linolenic acid (n-3) interfere the good functioning of LDL cholesterol (LDLc) receptors, i.e. interferes in the cholesterol turnover. Therefore, the aim of this study was to assess the effects of different levels of canola oil as sources of poly-unsaturated fats on modulation of total cholesterol and its fractions in the blood of pigs weighing 70 to 100 kg. Materials, Methods and Resul

Background: Pork is an important source of protein and the most widely consumed meat throughout the world. Besides, search for healthy food over the years has been growing, which has stimulated research to improve animal health and consequently, the quality of the final product offered to consumers. People know that who eats a high-fat diet has greater risk of developing metabolism changes, such as high cholesterol levels and consequently, cardiovascular diseases such as atherosclerosis. Studies focusing handling of these lipid food components, both quantitative and qualitatively, can significantly contribute to increase acceptability of animal products by consumers because it can generate knowledge to produce meat with less cholesterol. Among the different cooking oils that can be used in animal feed, the canola oil has drawn the attention of researchers due to its high unsaturated fatty acid contents. The hypothesis is that canola oil modifies the plasmatic profile of the lipoproteins because -linolenic acid (n-3) interfere the good functioning of LDL cholesterol (LDLc) receptors, i.e. interferes in the cholesterol turnover. Therefore, the aim of this study was to assess the effects of different levels of canola oil as sources of poly-unsaturated fats on modulation of total cholesterol and its fractions in the blood of pigs weighing 70 to 100 kg. Materials, Methods and Resul

Características da carcaça e viabilidade econômica do uso de cloridrato de ractopamina para suínos em terminação com alimentação à vontade ou restrita

The objective of this research was to evaluate the supplementation of 5ppm of ractopamine (RAC), associated or not with feed restriction, on carcass characteristics on finishing pigs and the economic viability of its use. Thirty hybrid barrows (life weight of 107.2±6.2kg), receiving the experimental diets during 28 days before the slaughter. A randomized blocks design in factorial scheme 2 x 2 + 1 (with or without RAC in diets with 1.04% of total lysine; ad libitum or feed restriction of 15% and an additional treatment - control - ad libitum, without RAC containing 0.8% of lysine - standard diet), totalizing five treatments and six replicates. The addiction of RAC per se increased the loin eye area, the meat percentage, the carcass meat:fat ratio, the allowance index, the gross earnings and the production net earnings and decreased the animals backfat thickness. When associated with feed restriction, the RAC decreased the carcass fat percentage. Compared to standard diet, the RAC increased the carcass yield, the carcass meat percentage and the allowance index paid to the producer and decreased the backfat thickness. The RAC associated at the feed restriction decreased the fat carcass percentage and increased the carcass meat:fat ratio and the gross earnings. Thus, the supplementation with 5ppm of RAC, associated or no at the feed restriction, improves the carcass characteristics and the economic viability of production.

O objetivo neste trabalho foi avaliar a suplementação de 5ppm de ractopamina (RAC) na ração, associada ou não à restrição alimentar, sobre as características da carcaça de suínos em terminação e a viabilidade econômica do seu uso. Foram utilizados 30 suínos machos castrados, Agroceres-PIC (peso vivo de 107,2±6,2kg), recebendo as dietas experimentais durante os 28 dias que antecederam o abate. Foi utilizado um delineamento em blocos casualizados em esquema fatorial 2 x 2 + 1 (com ou sem RAC em rações com 1,04% de lisina total; à vontade ou restrição alimentar de 15%; e um tratamento adicional - controle - fornecido à vontade, sem RAC, contendo 0,8% de lisina total - ração padrão), totalizando cinco tratamentos e seis repetições. A adição da RAC por si só aumentou a área de olho de lombo, a porcentagem de carne e a relação carne:gordura na carcaça, o índice de bonificação, a receita bruta e a receita líquida da produção e reduziu a espessura de toucinho dos animais. Quando associada à restrição alimentar, a RAC diminuiu a porcentagem de gordura na carcaça. Comparado à ração controle, a RAC aumentou o rendimento da carcaça, a porcentagem de carne na carcaça e a receita bruta paga ao produtor e reduziu a espessura de toucinho. Quando associada à restrição alimentar, diminuiu a porcentagem de gordura e aumentou a relação carne:gordura na carcaça e o índice de bonificação. Assim, a suplementação com 5ppm de RAC, associada ou não à restrição alimentar, melhora as características da carcaça e viabiliza economicamente a produção.

Características da carcaça e viabilidade econômica do uso de cloridrato de ractopamina para suínos em terminação com alimentação à vontade ou restrita

The objective of this research was to evaluate the supplementation of 5ppm of ractopamine (RAC), associated or not with feed restriction, on carcass characteristics on finishing pigs and the economic viability of its use. Thirty hybrid barrows (life weight of 107.2±6.2kg), receiving the experimental diets during 28 days before the slaughter. A randomized blocks design in factorial scheme 2 x 2 + 1 (with or without RAC in diets with 1.04% of total lysine; ad libitum or feed restriction of 15% and an additional treatment - control - ad libitum, without RAC containing 0.8% of lysine - standard diet), totalizing five treatments and six replicates. The addiction of RAC per se increased the loin eye area, the meat percentage, the carcass meat:fat ratio, the allowance index, the gross earnings and the production net earnings and decreased the animals backfat thickness. When associated with feed restriction, the RAC decreased the carcass fat percentage. Compared to standard diet, the RAC increased the carcass yield, the carcass meat percentage and the allowance index paid to the producer and decreased the backfat thickness. The RAC associated at the feed restriction decreased the fat carcass percentage and increased the carcass meat:fat ratio and the gross earnings. Thus, the supplementation with 5ppm of RAC, associated or no at the feed restriction, improves the carcass characteristics and the economic viability of production.

O objetivo neste trabalho foi avaliar a suplementação de 5ppm de ractopamina (RAC) na ração, associada ou não à restrição alimentar, sobre as características da carcaça de suínos em terminação e a viabilidade econômica do seu uso. Foram utilizados 30 suínos machos castrados, Agroceres-PIC (peso vivo de 107,2±6,2kg), recebendo as dietas experimentais durante os 28 dias que antecederam o abate. Foi utilizado um delineamento em blocos casualizados em esquema fatorial 2 x 2 + 1 (com ou sem RAC em rações com 1,04% de lisina total; à vontade ou restrição alimentar de 15%; e um tratamento adicional - controle - fornecido à vontade, sem RAC, contendo 0,8% de lisina total - ração padrão), totalizando cinco tratamentos e seis repetições. A adição da RAC por si só aumentou a área de olho de lombo, a porcentagem de carne e a relação carne:gordura na carcaça, o índice de bonificação, a receita bruta e a receita líquida da produção e reduziu a espessura de toucinho dos animais. Quando associada à restrição alimentar, a RAC diminuiu a porcentagem de gordura na carcaça. Comparado à ração controle, a RAC aumentou o rendimento da carcaça, a porcentagem de carne na carcaça e a receita bruta paga ao produtor e reduziu a espessura de toucinho. Quando associada à restrição alimentar, diminuiu a porcentagem de gordura e aumentou a relação carne:gordura na carcaça e o índice de bonificação. Assim, a suplementação com 5ppm de RAC, associada ou não à restrição alimentar, melhora as características da carcaça e viabiliza economicamente a produção.

Quality of pork cuts from swine receiving ractopamine as ration in different feed programs - DOI: 10.4025/actascianimsci.v30i2.4682 / Qualidade de cortes de suínos recebendo ractopamina na ração em diferentes programas alimentares - DOI: 10.4025/actascianimsci.v30i2.4682

This study evaluated the supplementation of ractopamine associated with feeding restriction in diets with high lysine content on the composition of pork cuts. Thirty barrows (107.2 ± 6.2 kg) were utilized, receiving the experimental diets during 28 days before slaughter. The randomized block design was applied in a 2 x 2 + 1 factorial (two levels of ractopamine 0 or 5 ppm in rations with 1.03% of total lysine; ad libitum or 15% feed restriction; and a control treatment, ad libitum, without ractopamine, with 0.8% of total lysine) with six replicates. The cuts were obtained from the left chilled carcass. The tenderloin percentage (RFIL), the ham (PCPER), shoulder (PCPAL), boneless shoulder (PCSOP) and bone-in loin (PCCAR) meat percentage, the average thickness (EB), flexibility (FB), amount of meat (QCB), fat (QGB) and meat:fat ratio of the belly (RCGB) were evaluated. The ractopamine increased RFIL, PCPER, PCPAL, PCSOP, PCCAR and RCGB when compared to diets without ractopamine and 1.03% of lysine. Compared to the control, ractopamine increased PCCAR and RCGB; decreased QGB; and when associated with the feed restriction, increased PCPER. Feed restriction decreased FB. The use of ractopamine increases the meat percentage in pork cuts and feed restriction decreases FB.

Avaliou-se a suplementação de ractopamina associada à restrição alimentar em rações com elevado teor de lisina sobre a composição de cortes suínos. Foram utilizados 30 suínos machos castrados (peso 107,2 ± 6,2 kg), recebendo as dietas experimentais durante 28 dias pré-abate. Foi utilizado um delineamento em blocos casualizados em fatorial 2 x 2 + 1 (dois níveis de ractopamina 0 ou 5 ppm em rações com 1,03% de lisina total; fornecidas à vontade ou 15% de restrição, e um tratamento controle, ad libitum, sem ractopamina, contendo 0,8% de lisina total) com seis repetições. Os cortes foram obtidos da carcaça esquerda resfriada. Foram avaliados o rendimento do filezinho (RFIL), as porcentagens de carne no pernil (PCPER), a paleta (PCPAL), a sobrepaleta (PCSOP) e o carré (PCCAR) e a espessura (EB), a flexibilidade (FB), a quantidade de carne (QCB), a gordura (QGB) e a relação carne:gordura (RCGB) da barrriga. A ractopamina aumentou o RFIL, PCPER, PCPAL, PCSOP, PCCAR e RCGB quando comparada com rações sem ractopamina e 1,03% de lisina. Comparado ao controle, a ractopamina aumentou o PCCAR e a RCGB; diminuiu o QGB e, quando associada à restrição, aumentou a PCPER. A restrição diminuiu a FB. O uso de ractopamina aumenta a porcentagem de carne nos cortes suínos e a restrição alimentar diminui a FB.

Quality of pork cuts from swine receiving ractopamine as ration in different feed programs - DOI: 10.4025/actascianimsci.v30i2.4682 / Qualidade de cortes de suínos recebendo ractopamina na ração em diferentes programas alimentares - DOI: 10.4025/actascianimsci.v30i2.4682

This study evaluated the supplementation of ractopamine associated with feeding restriction in diets with high lysine content on the composition of pork cuts. Thirty barrows (107.2 ± 6.2 kg) were utilized, receiving the experimental diets during 28 days before slaughter. The randomized block design was applied in a 2 x 2 + 1 factorial (two levels of ractopamine 0 or 5 ppm in rations with 1.03% of total lysine; ad libitum or 15% feed restriction; and a control treatment, ad libitum, without ractopamine, with 0.8% of total lysine) with six replicates. The cuts were obtained from the left chilled carcass. The tenderloin percentage (RFIL), the ham (PCPER), shoulder (PCPAL), boneless shoulder (PCSOP) and bone-in loin (PCCAR) meat percentage, the average thickness (EB), flexibility (FB), amount of meat (QCB), fat (QGB) and meat:fat ratio of the belly (RCGB) were evaluated. The ractopamine increased RFIL, PCPER, PCPAL, PCSOP, PCCAR and RCGB when compared to diets without ractopamine and 1.03% of lysine. Compared to the control, ractopamine increased PCCAR and RCGB; decreased QGB; and when associated with the feed restriction, increased PCPER. Feed restriction decreased FB. The use of ractopamine increases the meat percentage in pork cuts and feed restriction decreases FB.

Avaliou-se a suplementação de ractopamina associada à restrição alimentar em rações com elevado teor de lisina sobre a composição de cortes suínos. Foram utilizados 30 suínos machos castrados (peso 107,2 ± 6,2 kg), recebendo as dietas experimentais durante 28 dias pré-abate. Foi utilizado um delineamento em blocos casualizados em fatorial 2 x 2 + 1 (dois níveis de ractopamina 0 ou 5 ppm em rações com 1,03% de lisina total; fornecidas à vontade ou 15% de restrição, e um tratamento controle, ad libitum, sem ractopamina, contendo 0,8% de lisina total) com seis repetições. Os cortes foram obtidos da carcaça esquerda resfriada. Foram avaliados o rendimento do filezinho (RFIL), as porcentagens de carne no pernil (PCPER), a paleta (PCPAL), a sobrepaleta (PCSOP) e o carré (PCCAR) e a espessura (EB), a flexibilidade (FB), a quantidade de carne (QCB), a gordura (QGB) e a relação carne:gordura (RCGB) da barrriga. A ractopamina aumentou o RFIL, PCPER, PCPAL, PCSOP, PCCAR e RCGB quando comparada com rações sem ractopamina e 1,03% de lisina. Comparado ao controle, a ractopamina aumentou o PCCAR e a RCGB; diminuiu o QGB e, quando associada à restrição, aumentou a PCPER. A restrição diminuiu a FB. O uso de ractopamina aumenta a porcentagem de carne nos cortes suínos e a restrição alimentar diminui a FB.