Efectos de la suplementación con peladuras y hojas de yuca y tallos de caupí sobre el ambiente ruminal y parámetros sanguíneos de cabras Enanas del África Occidental

Abstract

sUMMAryThis experiment was conducted to evaluate the effects of supplementing cassava peels with cassava leaves and cowpea haulms on rumen fermentation and blood metabolites of West African dwarf (WAD) goats. Thirty West African dwarf bucks aged 8±1.3 months with an average body weight of 6.06±0.02 kg were used in a completely randomized experiment. The goats were randomly assigned to one of the five dietary treatments which consisted of milled cassava peels, cassava leaves and cowpea haulms in different ratios of 700:100:175 (T1); 500:200:275 (T2); 300:300:375 (T3) and 100:400:475 (T4) g/kg DM respectively. A standard diet formulated to meet the nutrient requirements of the animals with no cassava and cowpea haulms was used as the control diet (T5). Data collected was subjected to analysis of variance using the general linear model procedure of SAS. The results obtained indicated that the highest dietary crude protein was obtained in treatment 5 (206 g/kg) followed by treatment 4 (200 g/kg). Treatment 1 had higher neutral detergent fibre (660 g/kg) and hydrocyanide (30.00 mg/kg) contents. At 0 hr post-feeding, NH 3 -N values significantly ranged (L, Q, C: p<0.05) from 8.50 % in treatment 1 to 15.67 % in treatment 4. The acetic and propionic acid content was highest (C: p<0.05) in treatment 1 with values of 68.17 mol/100ml and 21.55 mol/100 ml, respectively. Total fungi counts were similar in treatments 3 and 5, but significantly different (Q, C: p<0.05) from other treatments. The acetic acid values significantly (Q: p<0.01; C: p<0.05) decreased from 63.70 mol/100 ml in treatment 1 to 62.49 mol/100ml in treatment 3; decline further to 61.78 mol/100ml in treatment 4. Values for total fungi counts ranged from 0.20 (cfu/ml x106) in treatment 2 to 0.60 (cfu/ml x106) in treatment 5. Packed cell volume (PCV) values ranged from 21.50 % in treatment 3 to 31.50 % in treatment 1. Haemoglobin concentration was highest in treatment 2 with values of 10.25 g/dl resulting in a significant linear and cubic trend. At the end of the experiment, there was a sharp decline in the PCV values of the goats in treatments 1, 2 and 5. Hb concentration values followed a similar trend though not significantly different (L, Q, C: p>0.05). RBC values significantly (L: p<0.01) increased as the levels of inclusion of cassava peels reduced. Total protein and globulin ranged from 53.30 to 67.30 (g/dl) and 22.00 to 34.60 (g/dl) respectively and were significantly (C: p<0.01; L, Q, C: p<0.01, 0.05) different. The study revealed that supplementing cassava peels with cassava leaves and cowpea haulms as protein sources has no negative effects on rumen fermentation and blood biochemical parameters of West African dwarf goats. Recibido