Performance and economic viability of broiler chickens fed with probiotic and organic acids in an attempt to replace growth-promoting antibiotics

The aim of this study was to evaluate diets supplemented with probiotic (Bacillus amyloliquefaciens) and organic acids (lactic, acetic and butyric acid) in attempt to replace the antibiotics and anticoccidial (avilamycin + sodium monensin) growth promoters on performance and economic viability of broilers challenged by Eimeria acervulina, E. maxima and E. tenella. A total of 900 male Cobb® chickens, with a mean weight of 39.90g, were distributed in a completely randomized design in a 2 × 2 + 1 factorial arrangement: supplementation or not of probiotic and organic acids and a treatment with inclusion of antibiotics, comprising five treatments with six replicates. For the studied performance variables, there was no effect of the isolated additives and no interaction between them (p>0.05). Only the antibiotics promoted better results for weight gain (WG), feed intake (FI) and feed conversion rate (FCR). Therefore, the use of organic acids and probiotic, isolated or associated, provided lower performance to those receiving antibiotics, not improving the performance of chickens under the imposed challenge conditions. The highest revenues were generated with the use of antibiotics, providing greater profits.(AU)

Performance and economic viability of broiler chickens fed with probiotic and organic acids in an attempt to replace growth-promoting antibiotics

The aim of this study was to evaluate diets supplemented with probiotic (Bacillus amyloliquefaciens) and organic acids (lactic, acetic and butyric acid) in attempt to replace the antibiotics and anticoccidial (avilamycin + sodium monensin) growth promoters on performance and economic viability of broilers challenged by Eimeria acervulina, E. maxima and E. tenella. A total of 900 male Cobb® chickens, with a mean weight of 39.90g, were distributed in a completely randomized design in a 2 × 2 + 1 factorial arrangement: supplementation or not of probiotic and organic acids and a treatment with inclusion of antibiotics, comprising five treatments with six replicates. For the studied performance variables, there was no effect of the isolated additives and no interaction between them (p>0.05). Only the antibiotics promoted better results for weight gain (WG), feed intake (FI) and feed conversion rate (FCR). Therefore, the use of organic acids and probiotic, isolated or associated, provided lower performance to those receiving antibiotics, not improving the performance of chickens under the imposed challenge conditions. The highest revenues were generated with the use of antibiotics, providing greater profits.

EXTRATO ALCALOÍDICO DA FARINHA DE VAGENS INTEGRAIS DE ALGAROBEIRAS EM DIETAS PARA CORDEIROS CONFINADOS

Objetivou-se avaliar os efeitos de dietas aditivadas com níveis de extrato alcaloídico da farinha de vagens integrais de algarobeiras- EAA (0 - sem aditivo; 2,3; 4,6 e 9,2 mg kg-1 na MS da dieta), comparando-se a dietas sem ou com 2,1 mg kg-1 de monensina sódica (MON) sobre o consumo, digestibilidade de nutrientes, desempenho produtivo, síntese de proteína microbiana, balanço de nitrogênio e excreção de ureia em cordeiros. Utilizaram-se 400 g de feno de Tifton 85 e 600 g de concentrado por kg de MS da dieta. Foram utilizados 30 cordeiros Dorper x Santa Inês, machos, não castrados, com peso corporal inicial de 17,50±0,43 kg, que foram distribuídos em delineamento inteiramente casualizado (DIC), com cinco dietas e seis repetições. O período experimental foi de 84 dias com quatro períodos de coleta nos últimos cinco dias, dentro do intervalo de 21 dias. Não houve diferença significativa para o consumo de nutrientes e energia metabolizável entre as dietas, exceto para o extrato etéreo (EE), que apresentou comportamento linear crescente em função dos níveis de EAA. Os coeficientes de digestibilidade de MS, MO, PB, EE, FDNcp, foram menores para as dietas com EAA em relação às dietas sem e com MON, exceto para digestibilidade de CNFcp, que apresentou ponto mínimo com 3,54 mg kg-1. As dietas com EAA não diferiram da dieta com MON para os parâmetros de desempenho, e o uso de EAA proporcionou maior peso corporal final que a dieta sem aditivo. A retenção de nitrogênio (N) e a excreção de ureia na urina também não foram afetadas pelas dietas. Houve maior proporção de N digerido em relação ao consumido para a dieta sem aditivo e com MON, evidenciado pela menor excreção fecal de N. A retenção de N proporcional ao N digerido não diferiu entre as dietas, tendo em vista que houve maior eficiência de síntese de proteína microbiana para as dietas com EAA. A adição de EAA na dose de 9,2 mg kg-1 MS da dieta promove maior peso corporal final em cordeiros durante o confinamento, devido ao aumento na eficiência de síntese microbiana. O fornecimento de proteína bruta em dietas com EAA pode ser reduzido para evitar a perda de nitrogênio fecal, sem prejuízo na retenção corporal de nitrogênio.

The objective of this study was to evaluate the effects of diets added with alkaloid extract levels of flours of whole pods of algarobeiras-EAA (0 - no additive, 2,3, 4,6 and 9,2 mg kg-1 in dietary DM), comparing to diets with or without 2.1 mg kg-1 sodium monensin (MON) on intake, nutrient digestibility, productive performance, microbial protein synthesis, nitrogen balance and urea excretion in lambs. 400 g of Tifton 85 hay and 600 g of concentrate per kg of DM from the diet were used. Thirty male Dorper x Santa Inês lambs, with an initial body weight of 17.50 ± 0.43 kg, were distributed in a completely randomized design (DIC), with five diets and six replicates. The experimental period was 84 days with four collect periods in the last five days, within the 21 day interval. There was no significant difference in nutrient and metabolizable energy intake between diets, except for ethereal extract (EE), which presented a linear behavior increasing as a function of EAA levels. The digestibility coefficients of DM, OM, CP, EE, NDFap, were lower for the diets with EAA in relation to the diets without and with MON, except for digestibility of CNFcp, which had a minimum point of 3.54 mg kg-1. The diets with EAA did not differ from the MON diet for performance parameters, and the use of EAA provided higher final body weight than the diet without additive. Nitrogen retention (N) and urine excretion of urea were also not affected by diets. There was a higher proportion of N digested than the one consumed for the diet without additive and with MON, evidenced by the lower fecal excretion of N. The retention of N proportional to the digested N did not differ between the diets, considering that there was greater efficiency of synthesis of microbial protein for the diets with EAA. The addition of EAA at the dose of 9.2 mg kg-1 DM from the diet promotes higher final body weight in lambs during confinement due to increased efficiency of microbial synthesis. The supply of crude protein in diets with EAA can be reduced to avoid the loss of fecal nitrogen, without prejudice to the nitrogen retention.