Residual frying oil in the diets of sheep: intake, digestibility, nitrogen balance and ruminal parameters.

Eduardo Lucas Terra Peixoto,Ivone Yurika Mizubuti,Elizabeth Dos Santos Moura,Edson Luiz De Azambuja Ribeiro,Odimari Pricila Pires Do Prado,Kássia Amariz Pires,Larissa Nóbrega De Carvalho,Elzânia Sales Pereira

doi:10.5713/ajas.15.0970

Abstract

ObjectiveThe objective of this study was to evaluate the intake and nutrient digestibility, nitrogen balance and ruminal ammonia nitrogen in lambs of diets containing different levels of residual frying oil.MethodsLevels of 0, 20, 40, 60, and 80 g/kg dry matter (DM) base of residual frying oil in the diets of lambs were evaluated. Five castrated lambs with initial body weights of 36.8±3.3 kg, distributed in a Latin square (5×5) design, were used.ResultsThere was a decreasing linear effect on the intake of DM, organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), total carbohydrates (TCH), and nonfibrous carbohydrates (NFC). There was an increased linear intake of ether extract (EE). The apparent digestibility of DM, OM, CP, NDF, TCH, and NFC, as well as urine nitrogen excretion, nitrogen balance and ruminal parameters, were not influenced by different levels of residual frying oil in the diet. EE digestibility presented a crescent linear effect.ConclusionIt can be concluded that the addition of residual frying oil to the diets of sheep can affect nutrient intake without affecting the digestibility of most nutrients (with the exception of EE), nitrogen balance and ruminal ammonia nitrogen concentration.

Highlights

The total amount of lipid in the diet of ruminants is less than 5%, lipids have a very important role in the energy metabolism of the animals because they are made up of a high proportion of fatty acids
The inclusion of lipids at levels greater than 5% of the dry matter (DM) in ruminant diets is related to changes in rumen fermentation [3]
Sampling and analysis of urine For urine collection, 25 mL of 1:1 of 50% solution of 95% HCl and water was placed in the collection containers daily between 11 and 14 days in each experimental period to prevent fermentation and ammonia losses in the urine by volatilization The total volume of urine excreted per animal was measured at intervals of 24 hours, and an aliquot corresponding to 10% of the total volume per animal was stored at –15°C for later composition analysis

Summary

Objective

The objective of this study was to evaluate the intake and nutrient digestibility, nitrogen balance and ruminal ammonia nitrogen in lambs of diets containing different levels of residual frying oil. Methods: Levels of 0, 20, 40, 60, and 80 g/kg dry matter (DM) base of residual frying oil in the diets of lambs were evaluated. Results: There was a decreasing linear effect on the intake of DM, organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), total carbohydrates (TCH), and nonfibrous carbohydrates (NFC). The apparent digestibility of DM, OM, CP, NDF, TCH, and NFC, as well as urine nitrogen excretion, nitrogen balance and ruminal parameters, were not influenced by different levels of residual frying oil in the diet.

INTRODUCTION

MATERIAL AND METHODS

RESULTS AND DISCUSSION

CONCLUSION