<p>This study measured the ruminal parameters, feed intake, fecal and urinary N production, and N balance (NB) in sheep fed increasing levels of residue from the extraction of tamarind pulp (RETP) on a 0.0%, 5.0%, 10.0%, and 15.0% dry matter (DM) basis. Four mixed-breed male sheep weighing 40.38 ± 2.10 kg of body weight were distributed in a 4 × 4 Latin square design. The animals were allocated to metabolism cages and fed twice a day. Each experimental period lasted 20 days. The pH and concentration of ammonia nitrogen (NH3-N) in ruminal fluid were measured. Nitrogen intake (NI), fecal N (FN), urinary N (UN), absorbed N (AN), and NB were expressed in g·day-1, percentage of consumed nitrogen (CN), and g·kg-1 of metabolic weight (g·(kg0.75)-1. Statistical analysis of these variables was performed by evaluating the variance and regression at 5% probability. The levels of RETP did not alter (p>0.05) the pH level or NH3-N concentration in the rumen fluid, but a quadratic behavior for the same values after feeding (p<0.05) was observed. The inclusion of RETP in the diet did not change (p>0.05) NI, UN, the AN in g·day-1 and g·(kg0.75)-1, NB in g·day-1 and g·(kg0.75)-1, or the percentage of CN. However, the AN as a percentage of CN showed a linear effect (p<0.05) with the inclusion of RETP in experimental diets. For FN in g·day-1 and g·(kg0.75) -1, no difference was observed (p>0.05) with the inclusion of RETP, but for FN expressed as a percentage of CN, a linear increase (p<0.05) was observed with the inclusion of RETP. Thus, we concluded that diets with up to 15.0% RETP do not alter the pH and NH3-N in ruminal fluid, NI, UN, or NB. In addition, the inclusion of 15.0% RETP has a laxative affect. </p>
ResumoAvaliou-se o consumo, a produção fecal e urinária de nitrogênio e o balanço de nitrogênio (BN) em cordeiros alimentados com diferentes teores de concentrado (20,0%, 40,0%, 60,0% e 80,0%) na região sudoeste do estado de Mato Grosso. Foram utilizados quatro cordeiros sem raça definida (SRD), inteiros, com peso corporal (PC) médio de 19,3 kg ± 2,1 alocados em gaiolas de metabolismo, alimentados duas vezes ao dia. O concentrado foi composto por grão de milho moído e farelo de soja e o volumoso fornecido foi silagem de milho. Foi utilizado um delineamento experimental em quadrado latino 4X4. As sobras, as fezes e a urina foram coletadas diariamente durante seis dias em cada período de coleta. Cada período experimental teve duração de 20 dias. Os dados de consumo de nitrogênio (N), N fecal, N urinário, N absorvido e BN expressos em g dia -1 ; % do nitrogênio consumido (NC) e gramas por quilograma de peso metabólico (g kg 0,75 -1 ) foram submetidos á análise de variância (ANOVA) e testados utilizando equação de regressão a 5% de probabilidade. Foi observado que a inclusão de diferentes teores de concentrado fornecidos aos cordeiros sobre o consumo de N, N urinário e N absorvido em g dia -1 , g kg 0,75 -1 e em % do NC apresentou um efeito quadrático (P<0,05) com ponto de máximo obtido para a inclusão de 40,0% de concentrado nas rações experimentais. Para o nitrogênio fecal em g dia -1 , g kg 0,75 -1 e em % NC e para o balanço de nitrogênio, a inclusão de concentrado na dieta alterou (P<0,05) de maneira linear decrescente com melhores resultados obtidos para os teores de inclusão de 20,0% a 40,0% de concentrado na dieta. Assim, conclui-se que o teor de 40,0% de concentrado na alimentação de cordeiros propicia os melhores valores de consumo de nitrogênio, nitrogênio urinário e nitrogênio absorvido em g dia -1 , g kg 0,75 -1 e em % do nitrogênio consumido, além de proporcionar resultados satisfatórios para os valores de nitrogênio fecal e balanço de nitrogênio expressos em g dia -1 , g kg 0,75 -1 e em % do nitrogênio consumido. Palavras-chave: Carboidratos, consumo, farelo de soja, urina AbstractEvaluated the nitrogen intake, fecal and urinary nitrogen production and nitrogen balance (NB) in lambs fed levels increasing of concentrate (20.0%, 40.0%, 60.0% and 80.0 %) in the southwestern region of
<p>This study measured the ruminal parameters, feed intake, fecal and urinary N production, and N balance (NB) in sheep fed increasing levels of residue from the extraction of tamarind pulp (RETP) on a 0.0%, 5.0%, 10.0%, and 15.0% dry matter (DM) basis. Four mixed-breed male sheep weighing 40.38 ± 2.10 kg of body weight were distributed in a 4 × 4 Latin square design. The animals were allocated to metabolism cages and fed twice a day. Each experimental period lasted 20 days. The pH and concentration of ammonia nitrogen (NH3-N) in ruminal fluid were measured. Nitrogen intake (NI), fecal N (FN), urinary N (UN), absorbed N (AN), and NB were expressed in g·day-1, percentage of consumed nitrogen (CN), and g·kg-1 of metabolic weight (g·(kg0.75)-1. Statistical analysis of these variables was performed by evaluating the variance and regression at 5% probability. The levels of RETP did not alter (p>0.05) the pH level or NH3-N concentration in the rumen fluid, but a quadratic behavior for the same values after feeding (p<0.05) was observed. The inclusion of RETP in the diet did not change (p>0.05) NI, UN, the AN in g·day-1 and g·(kg0.75)-1, NB in g·day-1 and g·(kg0.75)-1, or the percentage of CN. However, the AN as a percentage of CN showed a linear effect (p<0.05) with the inclusion of RETP in experimental diets. For FN in g·day-1 and g·(kg0.75) -1, no difference was observed (p>0.05) with the inclusion of RETP, but for FN expressed as a percentage of CN, a linear increase (p<0.05) was observed with the inclusion of RETP. Thus, we concluded that diets with up to 15.0% RETP do not alter the pH and NH3-N in ruminal fluid, NI, UN, or NB. In addition, the inclusion of 15.0% RETP has a laxative affect. </p>
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