Replacement of corn by cassava dregs in lambs’ diet
2019
Vasconcelos, Gustavo Araújo de | de Souza, Evaristo Jorge Oliveira | Véras, Robson Magno Liberal | Véras, Antonia Sherlânea Chaves | Carvalho, Francisco Fernando Ramos de | Silva, Janaina de Lima | Cardoso, Daniel Barros | Souza, Evaristo Jorge Oliveira de | Maciel, Michel do Vale
This study aimed to evaluate the effect of replacing corn with cassava dregs (0, 330, 660 or 1000 g/kg on a dry matter basis) on the intake and digestibility of nutrients, feeding behavior, performance and metabolic profile of 40 non-castrated crossbred Santa Inês lambs, aged 5 months old with an average initial body weight of 20 ± 1.87 kg. Due to the lower ether extract (EE) and neutral detergent fiber (NDF) content of cassava dregs, there was a quadratic effect (P<0.05) on the intake of these nutrients, with a maximum value of 30.6 and 398 g/day at 281 and 173 g/kg of replacement corn by cassava dregs, respectively. The digestibility of dry matter (DM), organic matter (OM), crude protein (CP), and non-fiber carbohydrates (NFC) increased linearly (P<0.05) with replacement. The duration of eating, rumination, chewing and idle, as well as the intake and rumination efficiency of DM, was not affected by replacement levels (P>0.05), whereas the intake and rumination efficiency of the NDF showed a linear decrease (P<0.05) with increasing amounts of cassava dregs. A quadratic effect was observed (P<0.05) on total weight gain and average daily gain, with an estimated maximum value of 19.6 kg and 286.0 g/day with the 229 and 495 g/kg replacement levels, respectively. This study indicates that cassava dregs supplemented with urea can completely replace corn for lambs fed diets based on 300 g/kg of corn.
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