The aim of this study was to evaluate the intake, digestibility, growth performance, and enteric methane emissions of Brazilian semiarid non-descript breed goats (NDG) fed diets with different forage:concentrate ratios (100:0, 80:20, 60:40, 40:60, and 20:80) on a dry matter basis. Forty uncastrated male NDG with an average initial body weight of 13.3 kg ± 4.7 kg were distributed in a completely randomized design, with five treatments and eight replications. Ground Tifton-85 hay was used as forage and ground corn and soybean meal were used as concentrate. The sulfur hexafluoride tracer technique was used to measure methane emissions. The intake of dry matter, organic matter, crude protein, and ether extract increased linearly while the intake of neutral detergent fiber decreased linearly as the concentrate proportion increased (P < 0.05). The digestibility of dry matter and organic matter increased while the digestibility of neutral detergent fiber decreased as the concentrate level increased (P < 0.05). There were linear increases in final body weight, total weight gain, average daily gain, and feed efficiency (P < 0.0001). Methane emissions per unit of body weight (ranging from 1.9 to 0.5 g/kg), metabolic body weight (ranging from 3.9 to 1.2 g/kg), and dry matter intake (ranging from 58.8 to 21.9 g/kg) reduced linearly as the concentrate proportion increased (P < 0.01). Decreasing the forage to concentrate ratio in the diet decreased methane emission and increased growth performance of NDG. The 80:20 ratio could be considered more appropriate to reduce methane emissions from NDG, which did not change much at higher levels of concentrate.
Objetivou-se avaliar com este trabalho a utilização da ervasal (Atriplex nummularia) irrigada com o resíduo da dessalinização, como alternativa alimentar em dietas para engorda de frangos Caipira Francês. Aos 28 dias de idade, foram selecionados, de forma individual e por peso, 120 frangos (60 machos e 60 fêmeas) que foram distribuídos em delineamento inteiramente casualizado, com quatro tratamentos, cinco repetições e seis aves por unidade experimental. As dietas experimentais foram isonutritivas e formuladas à base de feno da parte aérea da mandioca (FM), feno de Atriplex (FA), milho em grão moído e farelo de soja. Foram utilizados quatro tratamentos: 0%; 35%; 65%; e 100% de substituição do FM pelo FA na ração base. Não houve diferença significativa para o consumo de matéria seca, consumo de proteína bruta e consumo de energia bruta em relação à substituição do FM pelo FA que apresentaram médias de 133,9g/ave/dia, 19,8g/ave/dia e 543,3Kcal/ave/dia, respectivamente. A conversão alimentar das dietas testadas obteve comportamento linear crescente. Com substituição de 17,7% do FM pelo FA podemse obter ganhos máximos de 432,4g e 14,4g/dia, respectivamente para ganho médio total e diário. A substituição do FM pelo FA em intervalo de 46,4 a 50% apresentou melhores resultados para peso de carcaça e valores econômicos nas dietas testadas.
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