Resumen:
The effects of garlic oils on the environmental ruminal fermentation of two
agroindustrial by - products (corn stalk, oat straw) were studied using the in vitro
gas (GP) technique. Garlic oil at 0, 30, 90 and 180 mg / L of incubation medium
(equal to 0, 1.2, 3.6 and 7.2 mg / g of DM substrate) was added to each. The gas
volumes were recorded at 2, 4, 6, 8, 10, 12, 24, 36, 48 and 72 h of incubation. The
kinetics of gas production differed in garlic oil. Garlic oil increased (P <0.05) the
asymptotic GP and GP of corn stalks and oat straw. Garlic oil decreased the
fermentation pH (P <0.05) of corn stalks and oat straw. It can be concluded that
the application of garlic oil positively affected the ruminal fermentation of the two
agroindustrial by-products as fodder feed. Garlic oil had a better environmental and
sustainable effect on ruminal GP. By increasing the inclusion rate of oils, the
fermentation parameters were improved; the dose of 180 mg of oil / L increased
GP.
Descripción:
Livestock production industry suffers from increasing cost of grains and quality
forages. At the same time, there are large quantities of crop residues and byproducts
associated with the production of crops in the field. Such residues may
have important economic and environmental impacts as feed in the diet of
ruminants after upgrading their nutritive value (Kholif et al., 2014; Elghandour et al.,
2016). Corn stalk and oat straw have a poor nutritional value as animal feeds due to their low nitrogen and high fiber contents (Abdel-Aziz et al., 2015; Elghandour et al., 2016). Generally, the using of the raw fibrous residues as animal feeds within the farm is limited because their high fiber content, low crude protein (CP) content, poor palatability, and low nutrient digestibility (Khattab et al., 2013; Togtokhbayar et al., 2015), which invariably lowers the efficiency of digestive utilization (Khattab et al., 2013; Rojo et al., 2015). Thus and for better utilization as feeds for ruminant animals, improving the nutritive value of these feeds before feeding to animal, using different strategies is very important. One of the most effective and safe strategies is the using of feed additives, including essential and crude oils (Hernandez et al., 2017).