Net Energy Value of a Cassava Chip Ration for Lactation in Holstein–Friesian Crossbred Dairy Cattle Estimated by Indirect Calorimetry

The objectives of this research were to (1) determine the feed intake, digestibility, and energy utilization (2) estimate net value cassava chips consumed by lactating dairy cows. Four multiparous Holstein–Friesian crossbred cows at 139 ± 33 (mean SD) day in milk assigned according a 4 × Latin square design with four periods. treatments included diet substituted on 0%, 12%, 24%, 36% dry matter (DM) basis basal diet. Indirect calorimetry head cage respiration system was used nutrient utilization. Increasing number resulted linear increase (p < 0.05) intake digestibility but decrease 0.01) crude protein (CP) fiber. enteric methane yield intensity not affected > 0.05), while lost as feces urine reduced linearly 0.05). Milk composition (protein, fat, lactose) also increased requirement for maintenance estimated 327 kJ/kg metabolic body weight, efficiency metabolizable lactation 0.66. 8.03 MJ/kg DM.