Effects of Soybean Hulls and Lignosulfonate-Treated Soybean Meal, on Ruminal Fermentation in Lactating Dairy Cows

Abstract

Four Holstein cows were used in a 4 x 4 Latin square design to investigate the effects of soybean hulls and lignosulfonate-treated soybean meal on ruminal fermentation and nutrient passage to the duodenum. Diets contained 32% corn silage, 19.8% alfalfa-grass hay, and 48.2% concentrate (DM basis). Treatments, arranged in a 2 x 2 factorial, were concentrate mixes based on 1) corn and soybean meal, 2) corn and treated soybean meal, 3) soybean hulls and soybean meal, and 4) soybean hulls and treated soybean meal. Individual protein supplements supplied 40% of dietary CP, and corn or soybean hulls constituted 28% of dietary DM. Intake of OM (mean 18.9 kg/d) was similar among treatments, but intake of NDF was 42% greater, and intake of nonstructural carbohydrate was 55% less, for cows fed soybean hulls. Passage of OM to the duodenum was similar among diets, but flow of NDF was 43% greater, and flow of nonstructural carbohydrate was 56% less, for cows fed soybean hulls. Ruminal pH was similar, but total concentrations of VFA increased 7% when soybean hulls replaced corn. Ruminal digestion of dietary CP was 15% less for cows fed treated soybean meal, but bacterial N flows were similar among treatments. Soybean hulls were digested to a similar extent as corn, but few interactions occurred between supplemental carbohydrate and protein sources.

Soybean hulls replacing ground corn in diets for early lactation Saanen goats: intake, digestibility, milk production and quality

“…The soybean hulls replacing ground corn for early lactation Holstein cows, according Mansfield & Stern (1994) and Ipharraguerre et al (2002), did not alter the intake of dry matter and crude protein as the digestibility of organic matter, crude protein and NDF, even with a higher intake of NDF for diets with soybean hulls. However, Sarwar et al (1992) utilized the same feed replacement for early lactation cows and observed higher NDF digestibility for diets with soybean hulls.…”

“…3 P value: Probability of 0.05; L = linear, Q = quadratic NS: P>0.05; R 2 = regression coefficient. Table 5 -Production and composition of milk from Saanen goats fed soybean hulls replacing ground corn cows in early lactation demonstrating a variation in milk quality (Coomer et al, 1993;Mansfield & Stern, 1994;Ipharraguerre et al, 2002).…”

Fontes de carboidratos e porcentagem de volumosos em dietas para ovinos: balanço de nitrogênio, digestibilidade e fluxo portal de nutrientes

“…Utilizando dados de disponibilidade intestinal de CNF em vacas alimentadas com dietas formuladas com milho ou casca de soja, Mansfield & Stern (1994) sugeriram que mais glicose estaria disponível para a síntese de leite quando há maior consumo de milho. Nosbush et al (1996) verificaram que a concentração plasmática de glicose não foi afetada pela substituição completa do milho pela casca de soja em dietas com 30 e 60% desses alimentos na MS dietética.…”

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

“…Kovács et al (1998) diferenciaram a taxa de passagem do fluido ruminal e da passagem da fibra e concluíram que o aumento da taxa de passagem de fluido, ou taxa de diluição, pode influenciar a digestão e aumentar a taxa de passagem, em razão da mudança da consistência física da digesta ruminal. Avaliando a substituição do milho pela casca de soja, Mansfield & Stern (1994) observaram taxa de diluição semelhante entre as dietas (média de 13,5%/h), mas notaram maior volume ruminal para as dietas com a casca de soja, sugerindo que essa expansão tenha sido promovida por um mecanismo compensatório provocado pela digestão ruminal da casca de soja.…”