Feeding Value of Brown-Midrib Corn Silage for Lactating Dairy Cows

<p>A 14 wk lactation trial was conducted to evaluate the feeding value of brown-midrib (bm₃) corn silage and its normal (N) genetic counterpart using ten Holstein cows per group averaging 6 wk post-partum at the start of the experiment. The cow were fed corn silage (bm₃or N) ad libitum, 2.25 kg alfalfa hay/hd and grain (1 kg/3 kg milk produced) dairy. The bm₃ and N, respectively. Milk production for cows fed bm₃ and N was 25.0 and 25.5 kg/day. Fat corrected milk and solids corrected milk were similar for both groups. A total collection digestion trial was conducted with six cows from each group at the end of the laction trial. Digestibilities for bm₃and N ration were, respectively: dry matter, 62.9% and 59.5%; cell wall constituents, 60.1% and 50.5%; lignin, 50.9% and 44.3%; cellulose, 59.9% and 53.2%; hemicellulose, 66.5% and 62.8; and energy, 62.4% and 59.0%. There was no difference in nitrogen utilization for the two silage rations. Rumen sample were taken via the stomach tube at 0, 3, 6, 9 and 12 hr post-feeding the last day of the digestion trial. Concentrations of total volatile fatty acids (59.8 and 66.7 moles/ml for bm₃ and N) and butyrate (9.7 and 11.9 moles/ml) were greater for the N fed cows. Rumen pH was lower for N, while rumen ammonia was similar for both groups. Analysis of blood samples taken at the time of rumen sampling from the jugular vein showed that blood glucose and urea nitrogen concentrations were similar for both groups.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis - Open Access

Discipline thesis:degree_discipline

Dairy Science

Year dc:date.available

1978

Author dc:creator

• Sommerfeldt, Joel Leigh

• Dairy Science

Statement dc:rights

• <p>In Copyright - Non-Commercial Use Permitted<br /><a href="http://rightsstatements.org/vocab/InC-NC/1.0/">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>

Language dc:language

en

Repository record dc:identifier

https://openprairie.sdstate.edu/etd/1289

OAI identifier oai:identifier

oai:openprairie.sdstate.edu:etd-2290