quiz 2 - ADSC 4360/6360 Ruminant Nutrition Quiz 2 Key...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
ADSC 4360/6360 Ruminant Nutrition Quiz 2 –Key February 17, 2007 Answer 4 out of the 5 questions on note book paper: Name_______________________ 1. Dry matter intake is a factor critically linked to milk production. Lactating dairy cattle diets are formulated to maximize dry matter intake. Explain how a ruminant nutritionist formulates a ration to have the proper chemical and physical attributes that will induce the lactating cow to achieve its maximum intake. Chemical attributes: Fiber: Setting the NDF level at ~ 30 to 35% in the diet is critical to maximize intake and optimize milk production for any given forage. The set point is the level of fiber that maximizes intake between distension and chemostatic control. Fiber of sufficient particle size inhibits intake when cattle are fed above aet point in the diet, Fiber of sufficient particle size increases intake when cattle are fed below the set point. When appreciable amounts of high fiber byproduct feeds are used in the concentrate one should use adjusted NDF because it discounts non forage sources of NDF by 2/3. Other important factors: NE L : Energy is inversely related to fiber, so therefore properly setting the NEl level should maximize intake and milk production metabolizable protein: meeting EAA requirements is critical to maximizing intake Starch or non structural carbohydrates: high levels of starch can inhibit intake due to subclinical acidosis DCAD prepartum – post partum ca mobilization and proper intake Physical attributes: Particle size of forage is critical for fiber to have its impact on intake 2. Intake is critically important in dairy cattle production because the lactating cow needs amounts of nutrients and not necessarily concentrations of nutrients to meet its nutritional requirements. Predicting intake of dairy cattle is an important step in ration formulation. DMI is needed to determine if the concentration of nutrients are sufficiently set in a
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

quiz 2 - ADSC 4360/6360 Ruminant Nutrition Quiz 2 Key...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online