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- Is it better for forages to be more digestible or to digest . . . - USDA ARS
To evaluate forage fiber utilization you need to know pdNDF, kd and kp! Corn silage and haylage average! Grasses have higher TTNDFD values! Fiber digestibility has a big impact on milk yield Fiber digestion is affected by feed characteristics (pdNDF and kd) and the animal (kp, rumen vs hindgut digestion
- TTNDFD: A NEW APPROACH TO EVALUATE FORAGES - Cornell University
It is apparent that ruminants do not fully compensate for differences rates of fiber digestion (kd) by adjusting their voluntary DMI to alter passage (kp) of potentially digestible fiber Therefore, an estimate of total tract fiber digestibility can provide useful information about fiber utilization
- Using Digestible NDF to adjust intake and digestibility of forages
Balancing rations for carbohydrates (starch and NDF) are critical for health and production in high producing dairy cows A 2-3 unit change in fiber digestibility corresponds to 1 lb change in milk yield A 2-3 unit change in ration TTNDFD corresponds to 1 pound change in milk yield
- Fine Tune Feed Evaluation with Total Tract NDF Digestibility - Dairy Herd
The rate of passage of potentially digestible NDF through the cow (kp) Ruminal and hindgut fiber digestion TTNDFD integrates all of these factors to produce a single value
- Better Understanding Forage Fiber and Digestibility
Three fiber parameters must be measured to quantify NDF digestion: The proportion of NDF that is potentially digestible, the rate of ruminal degradation of the potentially digestible fiber, and the rate of passage of potentially digestible fiber
- Understanding the Integral Relationship Between uNDF and Digestion Rate . . .
uNDF: The undigested Neutral Detergent Fiber, is a measure of the fiber fraction that resists digestion, indicating feed’s resistance to digestive enzymes kd: Also known as the rate of digestion, is a value that indicates how quickly an animal can break down and absorb nutrients from the feed
- Abstract: TTNDFD: A new approach to evaluate forage fiber digestibility . . .
The parameters needed to estimate TTNDFD include the proportion of potentially digestible fiber (pdNDF), the digestion rate of the pdNDF (kd), the ruminal passage rate of pdNDF (kp), and post-ruminal digestion of NDF
- Forage fiber metabolism differs in dairy cows - alfalfa. org
fiber degradation and passage rate affect fiber metabolism and, ulti-mately, dairy cow productivity Ferreira conducted his study using two types of hay: alfalfa and orchardgrass He then formulated two distinct diets for the cows, each containing 30% NDF Both diets included one-third each of concentrate, corn silage, and hay Digestion rates
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