Forage Value & Poisonous Plants

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Presentation transcript:

Forage Value & Poisonous Plants Range Plants -- OBJ 2: PPT Jennifer Peterson Forage Value & Poisonous Plants Jennifer Peterson Rangeland Principles (REM 151) There are 16 slides in this presentation

Based on the most limiting nutrients on rangelands in the western U.S. Energy – Structural carbohydrates (e.g. cellulose) Sugars & Starch Fats (to a limited degree, but important for birds and rodents). Nutrients – Protein - Nitrogenous compounds Phosphorus = generally most limiting mineral on rangelands Vitamins = Carotene or Vitamin A When we talk about animals, we talk about energy requirements. In this presentation we are going to go more indepth into energy and nutrients. Phosphorus and Vitamin A are two nutrients that are not as readily available in rangelands environments.

What affects plant nutritive value? Cell structure (Ratio of Cell Wall to Contents) Degree of Lignifications “Anti-quality” factors The ratio of cell wall to cell contents describes the cell structure. Lignin is the component that binds cellulose and makes plants woody. Things that are poisonous and not very digestible are called secondary compounds, or anti-quality factors.

Cell structure: (Wall:Contents) Cell solubles Sugars Starch Organic acids Protein Cell wall Pectin Cellulose Hemicellulose Lignin Cutin Silica Mammals cannot deal with any of the components of the cell wall. All the things in the cell contents can be digested by mammals. So anytime you have cells with more cell contents, that cell is going to be more nutritious. What are some of the things that affects the

Degree of Lignification Lignin = indigestible portions of cell walls that impregnates cellulose to form wood. Lignin Structure is Complex Lignin is a polymorphic carbon compound that has a complex structure. This structure binds up the cellulose.

“Anti-quality” Factors Plants may contain compounds that: Are not digestible Reduce digestibility of nutrients Adversely affect the herbivore Make plants “unpalatable” More common in forbs and shrubs than grasses We will talk more about some of these antiquality factors.

“Anti-quality” Factors Inhibitors – Inhibit or reduced digestion Bind with nutrients to reduce digestibility Kill microbes and inhibiting microbial growth in gut Toxins – Affect herbivores directly Cause illness or death K. Launchbuagh Sheri Hagwood - BLM We will talk more about some of these antiquality factors.

Toxic or Poisonous Plants What is a toxic plant? What effects do toxic plants have? Death Birth Defects (called “Teratogenic” effects) Reproductive Dysfunction Bloat Dermatitis and Skin Sores Neurological Effects Etc. etc. etc. Plant that causes negative digestive or physiological effect Toxic plants can have many different effects on animals

Toxic or Poisonous Plants Type Name Longevity Origin Forb Tailcup Lupine Perennial Native Tall Larkspur Natve A wide variety of compounds in plant inhibit digestion or cause illness and death.

Tailcup Lupine Perennial | Native Raceme Seedhead Palmately Compound Leaves University of Idaho Stillinger Herbarium (http://www.pnwherbaria.org

Tailcup Lupine Perennial | Native Contains alkaloids Nervousness Excessive salivation or frothing at the mouth Reluctance to move about Difficulty breathing Twitching leg muscles Loss of all muscular control Convulsions Some lupines cause birth defects Coma & Death Jennifer Peterson Jennifer Peterson

Tall Larkspur Perennial | Native Raceme Seedhead Purple Flowers Palmately Lobed Leaves University of Idaho Stillinger Herbarium (http://www.pnwherbaria.org

Tall Larkspur Perennial | Native Contains Alkaloids: Sheri Hagwood, BLM Perennial | Native Contains Alkaloids: More livestock die from this plant than any other plant in North America. Symptoms: Nervousness Rapid, irregular pulse Weakness & staggering Animal may fall suddenly Death Excitement and physical exercise intensifies all signs of poisoning Responsible for more livestock death than any other plant in the N. America. Flowers have a spur on them which is where the name “larkspur” comes from.