Implants

Question 1

methods of hormonal manipulation (7)

Answer 1

castration
age
implants
MGA
genetics
nutrition
health

Question 2

where is castration an important hormone technique

Answer 2

brazil where implants are not approved for use

Question 3

how is finished weight determined

Answer 3

body weight where a specific body fat content is reached

Question 4

steroid hormones

Answer 4

derived from cholesterol
wide variety

Question 5

estrogenic hormones

Answer 5

estrodiol

Question 6

non steroidal estrogens

Answer 6

zeranol

Question 7

androgenic hormones

Answer 7

testosterone

Question 8

progestin hormones

Answer 8

progesterone
MGA (feed additive)

Question 9

genomic or direct mechanism of action

Answer 9

effect DNA
regulate transcriptional processed via nuclear translocation
leads to enhanced translation and increased protein synthesis

Question 10

indirect mechanism of action

Answer 10

binds a target gland resulting in a cascade of events that alter biological activity

Question 11

IGF-1 indirect effects

Answer 11

IGF1 increase DNa increase protein synthesis increase hypertrophy (cell size)

Question 12

TBA

Answer 12

trenbolone acetate

Question 13

direct effect of TBA

Answer 13

increased protein synthesis

Question 14

indirect effect of TBA

Answer 14

decreased protein catabolism

Question 15

TBA structural similarity

Answer 15

testosterone and estrogen

Question 16

what does TBA interphere with

Answer 16

corticotrophin induced stimulation of cortisol production

Question 17

satillite cells in young and adult calves

Answer 17

high in young calves for hypertrophy
decrease as age require hormones to keep muscle cells

Question 18

how does estrogen improve growth rate and feed efficiency
by how much

Answer 18

increase N retention
growth rate by 10-20%
FE by 5-8%

Question 19

net effects of TBA

Answer 19

reduced cortisol
increased protein synthesis
increased IGF 1 levels

Question 20

comination of estorgens and androgens

Answer 20

additive action
decr cort
incr protein synth
combined has more effieicnt response

Question 21

been using hormonal implants since the

Answer 21

1950s

Question 22

first generation implants had effective range

Answer 22

60-200 days

Question 23

first generation implants FE and ADG

Answer 23

5-10% improve FE
5-15% improve ADG

Question 24

WW increase in suckling calves with first gen implants

Answer 24

+20-40 lbs

Question 25

dont use estrogen based implants for

Answer 25

heifer and steers >45d or bulls that will be used for breeding

Question 26

too high implant dose

Answer 26

decrease efficiency

Question 27

implants promoted

Answer 27

higher DMI

Question 28

what are low potency implants used in

Answer 28

young calves

Question 29

what are mod potency implants used in

Answer 29

stockers not confined

Question 30

what are high potency implants used in

Answer 30

feedlot confined

Question 31

when do you want the highest potency implant

Answer 31

last

Question 32

last decade payout periods have been up to

Answer 32

200d

Question 33

buller frequency

Answer 33

2.5% is typical 3-5% on agressive implant programs

Question 34

how do you get stagy

Answer 34

TBA estrogen programs (re implanting)

Question 35

can you implant heifers to use for breeding

Answer 35

take caution. could implant once if you really want to

Question 36

step 1 implant strat

Answer 36

determine terminal implant should be most potent

Question 37

step 2 implant strat

Answer 37

determine days from arrival to terminal implant date

Question 38

STR + TBA implant results

Answer 38

11.5% increase in intake 21.85 increase in weight gain 18.7% increase ADG 3.7% incrase gain to feed