Feed intake and digestibility by cattle consuming bermudagrass or orchardgrass hay supplemented with soybean hulls and(or) corn

Abstract

Effects of supplementing cattle consuming tropical or temperate grass with corn and (or) soybean hulls on feed intake and digestibility were determined. In Exp. 1, eight Holstein steer calves (210 +/- 9.2 and 269 +/- 9.4 kg initial and final BW, respectively), in two simultaneous Latin squares, were given ad libitum access to bermudagrass (B) or orchardgrass (O) hay without supplementation or with (DM basis) .5% of BW of ground corn (C), .7% of BW of soybean hulls (H), or .25% of BW of corn plus .35% of BW of soybean hulls (CH). Total OM intake was greater (P < .05) with than without supplementation (5.05, 6.04, 5.95, 6.06, 6.04, 6.81, 6.61, and 6.69 kg/d), and digestible OM intake was affected by forage source (P < .05), mixing of supplement types (CH versus the mean of C and H; P < .09), and the forage source x supplementation interaction (P < .09; 2.65, 3.40, 3.33, 3.46, 3.71, 4.14, 3.98, and 4.30 kg/d for B, B-C, B-H, B-CH, O, O-C, O-H, and O-CH, respectively). Total tract NDF digestibility was greater (P < .05) for O than for B diets and for H than for C (56.4, 53.9, 58.1, 56.9, 68.5, 64.9, 67.7, and 69.6% for B, B-C, B-H, B-CH, O, O-C, O-H, and O-CH, respectively). In Exp. 2, mature cannulated beef cattle (524 +/- 1.6 kg BW) were used in a design similar to Exp. 1 with comparable dietary supplement levels.(ABSTRACT TRUNCATED AT 250 WORDS)

Cinética digestiva e eficiência de síntese de proteína microbiana em novilhos alimentados com farelo de girassol e diferentes fontes energéticas

“…Silveira (2001) relatou problemas com a utilização do Co-EDTA para a estimativa do volume ruminal, com média de 26% do peso corporal. Galloway et al (1993) avaliaram a suplementação com milho, casca de soja ou milho e casca de soja em novilhos alimentados com feno de capim coastcross (Cynodon dactylon, L. Pers.)…”

“…Todavia, Grigsby et al (1993) não observaram efeito da substituição do milho pela casca de soja e obtiveram valores médios de 9,5%/h.…”

“…Acredita-se que o alto coeficiente de variação (54%) para a taxa de passagem das fontes energéticas milho, casca de soja e farelo de gérmen de milho seja conseqüência da técnica de marcação da fibra com dicromato de sódio, possivelmente pelo baixo teor de carboidrato estrutural ou pelo seu arranjamento nesses ingredientes. Galloway et al (1993), avaliando a suplementação com milho e casca de soja em novilhos alimentados com feno de capim coastcross (Cynodon dactylon, L. Pers.…”

“…Grigsby et al (1993) observaram que a substituição do milho pela casca de soja, na suplementação de novilhos alimentados com feno de baixa qualidade promoveu efeito quadrático sobre o fluxo de N microbiano para o duodeno, apresentando fluxo máximo de N quando a relação casca de soja e milho foi de 66:34.…”

Effect of particle size and partial replacement of alfalfa hay by soya bean hulls on nutrient intake, total tract digestibility and rumen degradability of diets by Holstein steers

“…Intake of NDF and CP was not affected (p > 0.1) by particle size of AH or by SH inclusion in diets. In contrast, ad libitum consumption of steers with higher level of SH has been shown to increase intake of DM, OM, and fibre and their digestibility (Grigsby et al., ; Galloway et al., ). Inclusion of SH in diets increased EE intake (p < 0.01) in steers fed SH‐containing diets.…”