Maejo International Journal of Science and Technology (Oct 2009)
Nutritive value and nutrient digestibility of ensiled mango by-products
Abstract
Mango canning by-products (seed and peel) together with ensiled mango peel were subjected to analysis of dry matter (DM), ash, crude protein (CP), crude fibre (CF), ether extract (EE), nitrogen-free extract (NFE), gross energy (GE), neutral detergent fibre (NDF) and acid detergent fibre (ADF). In vitro digestibility of DM (IVDMD), ADF (IVADFD) and NDF (IVNDFD) was determined after digesting the by-products in buffered rumen fluid for 24 or 48 h in an incubator. CP content in peel, seed and peel silage is 4.68, 4.19 and 5.27% respectively. As expected, mango seed has a higher fibre content than mango peel and peel silage as indicated by NDF (53.01 vs 25.87 and 27.56% respectively) and ADF (31.02 vs 19.14 and 17.68% respectively). However, mango seed also has greater GE than mango peel and peel silage (4,070 vs 3,827 and 3,984 kcal/g DM respectively), probably due partly to its high fat content.Four head of male native cattle were used to determine nutrient digestibility of ensiled mango by-products by randomly allowing them to receive ensiled mango peel with rice straw (EMPR) and different levels of Leucaena leaves. Treatments consisted of: 1) ensiled mango peel + rice straw (90:10); 2) ensiled mango peel + rice straw + Leucaena leaves (85:10:5); 3) ensiled mango peel + rice straw + Leucaena leaves (80:10:10); and 4) ensiled mango peel + rice straw + Leucaena leaves (75:10:15). Addition of Leucaena leaves to silage increased apparent digestibility of DM (53.84, 55.43, 59.04 and 58.69% for the four formulations above respectively), probably because of increasing amounts of CP from Leucaena leaves, resulting in greater digestibility of NDF (39.11, 44.47, 47.12 and 43.32% for the four formulations above respectively). Total digestible nutrients (TDN) and digestible energy (DE) showed the same trends as apparent digestibility of DM.
