the lower use of high energy consuming feedstuff.
According to the results of present study, higher amounts of CP and EE in experimental treatments, can increase GE content, however, it should be noticed that the GE is not a good criterion for accessible energy of the feedstuffs by the animal (Walker et al. 2004).
The estimation of the digestibility and metabolizable energy content of ruminant feedstuffs from the gas production when they are incubated with rumen liquor in vitro.
Consequently, to reach income levels of production it is necessary to supplement animal feeding with low-cost feedstuffs that supply energy and protein in the critical periods, to extend the suckling period and maintain milk and meat production (Azócar and Rojo, 1991; Azócar et al. 1996).
Human-edible inputs were calculated for 2 different scenarios based on minimum and maximum potential recovery rates of human-edible energy and protein from the respective feedstuffs.
Crude glycerin is a good alternative energy feedstuff for dairy cows at a dietary inclusion levels of up to 120 g/kg dry matter in partial substitution of ground corn in dairy cow rations, and may even improve milk protein concentration.
Consumption of each feedstuff is estimated as percentage energy intake on yearly basis.
The cows had access to straw 1 Metabolizable energy. 2 The carotenoid content in the feedstuffs was not determined in this study.
A relatively small number of feedstuffs are used in catfish feeds, primarily because only few feedstuffs are available that can supply the nutrients and energy required for optimum growth of catfish.
Therefore, to ensure consistency within the database, the nutritional values (metabolizable energy, CP and amino acid) of each treatment were estimated using NRC tables of feedstuffs composition (NRC, 1994).
They are mostly used for feedstuff.
