TY - JOUR AU - Boschini-Figueroa, Carlos AU - Elizondo-Salazar, Jorge Alberto PY - 2005/09/17 Y2 - 2024/03/29 TI - Energetic and proteic characterization of prime sources of animal origin used in the formulation of a balanced feed for dairy cattle. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 16 IS - 2 SE - Articles DO - 10.15517/am.v16i2.11872 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11872 SP - 191-198 AB - <p>The kinetics of ruminal</p><p>degradation of dry matter, crude protein and ether extract were</p><p>determined for fish, meat and bone, and poultry meals. These</p><p>meals of animal origin showed characteristics proper of the</p><p>species of origin, not only in the soluble fraction but also in</p><p>the rates of ruminal degradability of the potentially degradable</p><p>fraction. Based on the results of degradation after 48 hours of</p><p>ruminal incubation, the true digestible contents of the protein</p><p>and the digested ether extract were determined biologically,</p><p>making the measurement of the total digestible nutrients, and</p><p>the concentration and net rate of digestible energy and feed,</p><p>more precise than determinations by chemical methods. The</p><p>concentrations of energy for milk production was 2.02, 1.66,</p><p>and 2.60 Mcals/kg for fish, meat and bone, and poultry meals,</p><p>respectively. The fraction of soluble protein (A) was high in</p><p>fish meal (75.29%), intermediate in meat and bone (46.83%),</p><p>and low in poultry (25.75%), with a degradable fraction (B) of</p><p>10.62, 27.66, and 42.06%, along with an insoluble fraction (C)</p><p>of 14.09, 25.51, and 32.19%, respectively. The degraded</p><p>protein in the rumen was 83.23, 66.25, and 51.98% in the</p><p>same order cited above. The contents of crude protein</p><p>effectively retained by the animals during the whole digestive</p><p>process were 53.29, 51.86, and 42.05% for fish, meat and</p><p>bone and poultry meals, respectively.</p> ER -