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

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. Five castrated lambs with initial body weights of 36.8±3.3 kg, distributed in a Latin square (5×5) design, were used. 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). 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. Conclusion It 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

Desempenho, características de carcaça e avaliação econômica da substituição do milho grão inteiro por casca de soja peletizada na alimentação de cordeiros em confinamento

This work was carried out with the objective of evaluating the effects of different levels of replacement of whole grain corn by pelleted soybean hulls in high concentrated diet, without long fiber use, on intake, productive performance and economical viability of feedlot lambs production. Twenty four Texel lambs, 12 males and 12 females of the same age, with average weight of 23 kg, distributed in 12 stalls, in a completely randomized design, were used. The treatments consisted of replacement of whole grain corn by pelleted soybean hulls, at levels of 0% (SH0), 15% (SH15) and 30% (SH30). Dry matter (DM) (kg day-1), crude protein (CP) (kg day-1, %AW, g AW0,75), and neutral detergent fiber (NDF) (kg day-1, %AW, g AW0,75) intake showed linear increasing behavior (P<0.05) according to increasing levels of soybean hulls replacing the corn grain in the diet, however, the ether extract (EE) intake (g day-1) presented quadratic effect. There were no differences in DM intake in relation to weight and metabolic body size, as well as, to mineral material (MM) (g day-1) and total digestible nutrients (TDN) intake (kg day-1, %AW, g AW0,75). In average daily gain (ADG), a quadratic effect of different levels of soybean hulls in the diet was observed (P<0.05), with weight gain of 0.267; 0.327 and 0.224 kg day-1, in levels of 0, 15 and 30%, respectively. The feed conversion was affected in a increasing linear way (P<0.05) with the soybean hulls inclusion in the diet. It was not observed differences in the carcass traits. When increasing levels of soybean hulls were added to the diet, it was observed decreasing in cost/kg ration (R$), however, there was increasing cost of meat produced (kg). In a general way, it can be concluded that replacement of whole corn by pelleted soybean hulls in high concentrated diet, in a proportion of 15$), porém houve aumento no custo do quilograma de carne produzida. De maneira geral, pode-se concluir que a substituição do milho inteiro por casca de soja peletizada em rações completas com alto teor de concentrados, na proporção de 15%, aumenta o ganho de peso de cordeiros em confinamento e na proporção de 30% afeta negativamente o desempenho animal, contudo não influencia as características de carcaça. Rações sem inclusão de casca de soja produz carne com menor custo