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Prececal, postileal, fecal, and urinary endogenous nitrogen compounds in equines


Revista Brasileira de Zootecnia 27(3): 538-545, May-June
Prececal, postileal, fecal, and urinary endogenous nitrogen compounds in equines
The objective of this work was to estimate the endogenous losses of nitrogen compounds in the digestive tract at the prececal, postileal, fecal, and urinary levels. Five foals, fistulated in the ileum, were fed diets with coast-cross grass hay, corn, soybean meal, and premix with variable levels of protein, in a 50:50 concentrate:forage ratio mixture, three times a day, at 8 a.m., 2 p.m., and 8 p.m. Urine was collected during a period of 12 hours. Endogenous nitrogen compounds in the various segments of the digestive tract were estimated by linear regression of the quantities of nitrogenous compounds apparently digested prececally and total as a function of the quantity of nitrogenous compounds consumed, and the quantities of nitrogenous compounds apparently digested postileally in function of the nitrogenous compounds arriving in the large intestine. The urinary endogenous nitrogen compounds were estimated by linear regression of the quantity of nitrogen compounds in the urine in function of the quantity of nitrogen compounds apparently absorbed. A complete randomized block design was used with five treatments (levels of protein) and four blocks (periods). The prececal, postileal, fecal, and urinary endogenous nitrogen compounds were estimated to be 165.87, 534.76, 467.38, and 339-22 mg/kg0.75 respectively. The fecal metabolic nitrogen was also estimated to be 111.6 mg/kg live weight or 5.1 g/kg dry matter consumed, and endogenous urinary nitrogen was 64.2 mg/kg live weight. The fecal and endogenous urinary total losses estimated were 261.03 mg/kg0.75. The efficiency of utilization of dietary protein was estimated to be 56.6%.


Accession: 003237817



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