Lesson Plans
Animal Science 2nd Q 05.06 Lesson Plans
Week: 01/09/2006 Instructor: Josh Barron Academics
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Monday:
Begin working with animal parasites, Where they come form what they do to the ag animals.
Parasites Term’s
Symbiosis – Two organisms living in close relationship with one another

Mutualism – relationship that is beneficial to both species of animals
EX. Rumen of cattle, Tick birds, lichen

Commensalism – is the relationship of animals when one benefits and the other is not harmed EX. Cattle and houseflies

Parasitism – relationship that is beneficial to one but harmful to another
- animal that feeds is the parasite
- animal that parasite lives on or in is the host
Ex. Tape worms, Ticks, Lice

Many parasites live off of blood, Blood carry’s oxygen and food nutrients,
Anemia - is disease caused by deficiency of hemoglobin, iron, or RBC


Life Cycle – Called Metamorphosis
Egg
Larva – worm like, does damage to plants
Pupa – dormant
Adult – lays eggs

Parasites
1. Internal – live within the animal’s body
2. External – Live on the animal’s body
1a. Roundworms -

Live: in the digestive track and cause more damage than any other group of internal parasites
-Stomach worms – burrow into the animals stomach and suck their blood
Problems:
- reduce enzymes in the stomach/cannot digest food as well
- secret waste which are poisons to the animal/causes animal illness,
- lay eggs that are excreted out/ to infect other animals
Tuesday:
Lab
Wednesday:
Notes1b. Tapeworms - segmented, each segment can reproduce
Problems: doesn’t allow enough nutrition for the animal
Live: small intestine and Feed on the ingested food
Size: up to 25 ft
Life cycle: parts of adult break off and are passed through the animal,
- in these segments are eggs,
- eggs are eaten by a mite, mite lives on grasses which are eaten by animals
- the mite is an intermediate host

1c. Flukes – small seed shaped flat worms
Problems: ruin liver, make animal less productive
Live: in various parts but the most damaging live in the liver
Intermediate host – snails/ so needs to be in or near water


2 External not as damaging as internal
2a Ticks attach themselves to warm-blooded animal and suck blood
Problems: Transmit disease – lime, Rocky Mountain Spotted Fever
Live: Adults lay eggs in the grass pg 292
The following spring they hatch into larva which attach to hosts
Fall to the ground and go through metamorphosis
Next spring they are nymphs
Then adults the following year


2b Lice – tiny, wingless insects
blood sucking lice – draw blood through the skin
biting lice – feed on hair or skin and excretions
Problems; discomfort for the host, less time eating, and reproducing
Live: whole life on host, eggs are attached to hair, nymphs hatch and grow into adults

2c Heel Flies aka cattle grubs –
Life cycle – adult fly lands on the heel of a cow,
lays eggs,
when the larva emerge they borrow through the soft tissue of the animal all the way from the leg to the back,
They then fall to the ground and turn into a pupae and mature into adults
Problems: discomfort to animal, meat and hide damaged

Parasite Control:
Medication – most widely used method
Internal – the meds are ingested through food, pills, injections
External – meds are sprayed, poured on or run through a dipping vat
Biological control – use of natural means rather than meds
- Screwworm – female lays eggs in open wound. Larva (maggots) prevent the wound from heeling then land on the ground and develop into adults
- Learned that only once in a life do these screwworms mate
- Made adults sterile and released into the wild so no eggs were produced thus after several years no more screwworms
Thursday:
fly swatter Parasite review
Friday:
Test begin animal diseases
1b. Tapeworms - segmented, each segment can reproduce
Problems: doesn’t allow enough nutrition for the animal
Live: small intestine and Feed on the ingested food
Size: up to 25 ft
Life cycle: parts of adult break off and are passed through the animal,
- in these segments are eggs,
- eggs are eaten by a mite, mite lives on grasses which are eaten by animals
- the mite is an intermediate host

1c. Flukes – small seed shaped flat worms
Problems: ruin liver, make animal less productive
Live: in various parts but the most damaging live in the liver
Intermediate host – snails/ so needs to be in or near water


2 External not as damaging as internal
2a Ticks attach themselves to warm-blooded animal and suck blood
Problems: Transmit disease – lime, Rocky Mountain Spotted Fever
Live: Adults lay eggs in the grass pg 292
The following spring they hatch into larva which attach to hosts
Fall to the ground and go through metamorphosis
Next spring they are nymphs
Then adults the following year


2b Lice – tiny, wingless insects
blood sucking lice – draw blood through the skin
biting lice – feed on hair or skin and excretions
Problems; discomfort for the host, less time eating, and reproducing
Live: whole life on host, eggs are attached to hair, nymphs hatch and grow into adults

2c Heel Flies aka cattle grubs –
Life cycle – adult fly lands on the heel of a cow,
lays eggs,
when the larva emerge they borrow through the soft tissue of the animal all the way from the leg to the back,
They then fall to the ground and turn into a pupae and mature into adults
Problems: discomfort to animal, meat and hide damaged

Parasite Control:
Medication – most widely used method
Internal – the meds are ingested through food, pills, injections
External – meds are sprayed, poured on or run through a dipping vat
Biological control – use of natural means rather than meds
- Screwworm – female lays eggs in open wound. Larva (maggots) prevent the wound from heeling then land on the ground and develop into adults
- Learned that only once in a life do these screwworms mate
Made adults sterile and released into the wild so no eggs were produced thus after several years no more screwworms
 
 
 
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