Varying degradation rates of total nonstructural carbohydrates: effects on nutrient uptake and utilization by the mammary gland in high producing Holstein cows.

Six ruminally cannulated Holstein cows at 56 to 77 d of lactation were fed three total mixed rations that varied in ruminal degradation rates of total nonstructural carbohydrates (6.04, 6.98, and 7.

Varying degradation rates of total nonstructural carbohydrates: effects on ruminal fermentation, blood metabolites, and milk production and composition in high producing Holstein cows.

Twelve multiparous Holstein cows (6 ruminally cannulated and 6 intact) at 56 to 77 d of lactation were used in an experiment with a 3 x 6 Latin square design. Cows were fed three total mixed rations that varied in degradation rates of total nonstructural carbohydrates (6.04, 6.

Effects of processing method on degradation characteristics of protein and carbohydrate sources in situ.

Two ruminally cannulated Holstein cows in early lactation were used to determine the effects of heat treatment and particle size on fractional degradation rates and ruminal degradabilities of DM, CP and total nonstructural carbohydrate of dry shelled corn and soybeans. A randomized complete block design with cows as blocks was used. Carbohydrate sources were cracked corn, chick cracked corn, finely ground corn, and steam-flaked corn.

Effect of corn silage supplementation on intake and milk production in cows grazing grass pasture.

The objective was to determine the effects on milk production and DMI of 2.3 kg/d of corn silage DM fed to lactating cows grazing grass pasture and fed supplemental grain. Thirty Holstein cows, averaging 32 kg of milk at the start of the trial, intensively grazed grass pasture for 8 wk.

Supplemental dietary fat and ruminally protected amino acids for lactating Jersey cows.

Eight Jersey cows receiving a 50:50 ratio of forage to concentrate on a DM basis were used in a replicated 4 x 4 Latin square design to determine the effects of added fat (3.4% of dietary DM) and ruminally protected AA (8 g of Met and 24 g of Lys daily) on yield and composition of milk. Treatments were 1) basal control, 2) added fat, 3) added AA, and 4) fat plus AA.

Improved techniques for dissociating particle-associated mixed ruminal microorganisms from ruminal digesta solids.

Combinations of physical and chemical methods were evaluated for their ability to remove particle-associated microorganisms (PAM) from saline-washed ruminal digesta solids (SWRDS). Physical methods included chilling and storage, homogenization, multiple extraction, and agitation with marbles. Chemical methods included use of low pH, Tween 80, formaldehyde, methanol, tertiary butanol, and methylcellulose.