Degradability and kinetics of fibrous particles in cattle fed diets based on corn silage and concentrates with or without addition of lipids

Abstract

-Eight rumen-cannulated steers were assigned to two 4 × 4 balanced Latin squares to evaluate degradability and kinetics of fiber particles from diets based on corn silage and supplements with or without addition of lipids. Dietary treatments were: only corn silage (T1), corn silage plus concentrate with no added lipids (T2), corn silage plus concentrate with added soybean oil (T3), and corn silage plus concentrate containing ground soybean seeds (T4). Kinetics of gastrointestinal transit of fibrous particles was evaluated based on chromium-mordanted fiber. Events of rumen degradation dynamics of fibrous carbohydrates were quantified using the in situ incubation procedure. The mixed models methodology from SAS was used to fit models and the Tukey test was used to compare means. The ruminal digestibility of fiber was lower in treatments T3 and T4 and, consequently, lower proportions of potentially digestible fraction of standardized fiber and higher proportions of indigestible fraction of standardized fiber for treatments T3 and T4 compared with T1 and T2 were observed. However, there were no differences in mean retention time of the rumen, total mean retention time, mean digestion time, and rumen fill among diets. Animals from T2, T3, and T4 showed higher dry matter intake, organic matter intake, and crude protein intake rates than animals receiving T1 diet, but there was no effect of the addition of lipid. Treatments did not differ regarding neutral detergent fiber intake. Animals from T1 had lower crude fat intake than animals from T2, which showed lower crude fat intake than those from T3 and T4. The addition of lipid to concentrate has no effect on passage rate, digestion rate, and intake, when a good quality roughage is used.

Use of black soldier fly larvae (Hermetia illucens) to substitute soybean meal in ruminant diet: An in vitro rumen fermentation study

“…Since supplementation of BSF1 or BSF2 increased EE content to 15.1 or 12.8% DM, respectively, it is clear that such high amount of EE contributes to a decrease of fiber digestion, and hence, decrease of IVDMD and IVOMD. In agreement with the present finding, dietary addition of soybean oil [ 42 ], palm oil, or linseed oil [ 43 ] was demonstrated to reduce fiber, DM, and OM digestibility in cattle. A possible solution for the high EE in BSF is to remove the lipid through mechanical or chemical extraction.…”

Parâmetros de fermentação in vitro de palha de braquiária processada ou não processada e subprodutos do processamento de batata e mandioca

“…When compared to corn silage, they showed lower k1values. Conversely, the k2 values of the tested diets (0.040 and 0.037) were greater than those of corn silage (Processi et al, 2016). Bendia et al (2021) evaluated the nutritional potential of corn hybrids using the in vitro gas production technique and the values they estimated are comparable to those found in this study for diets.…”

Assessing rumen microbial composition and fibre attachment in dairy cows

“…Hence, a combined effect of ruminal mastication, host enzymatic action and microbial activity results in breakdown of plant fibres, thereby reducing the particle size. The time spent for rumination depends on the particle size of the ingested feed, with the average retention time varying from 34 -40 hours depending on the feed (Dehority, 2002;Huhtanen et al, 2016;Processi et al, 2016).…”