LA repro stuff

Question 1

normal bovine estrus length?

behavior length?

Answer 1

24 hr

7 or 12-18 in beef

Question 2

what is the goal calving interval

Answer 2

13 month

Question 3

what is the time PP that an animal that a cow is dry

Answer 3

60-80 days

Question 4

how long do you expose a bull to beef cows

Answer 4

60-75 days

Question 4

what are three ways to detect estrus

Answer 4

direct observation, detection aids, hormonal assessment

Question 4

what can affect heat detection

Answer 4

weather, stress, malnutrition

Question 4

efficiency and accuracy

Answer 4

efficiency is how good you are at catching those in heat

accuracy is are you calling false positives

Question 5

what is a heat detection rate

Answer 5

bred/eligible in a 21 day period

Question 6

AM PM rule in ruminants

Answer 6

if she is in estrus in AM, breed in PM

Question 7

when does ovulation occur once estrus has begun in cows/ewes?

Answer 7

24-32 hours

Question 8

when does oculation occur once estrus has begun in sows

Answer 8

36-44hrs

Question 9

what shortens luteal phase?
what lengthens the luteal phase?

Answer 9

prostaglandins shorten
progestins lengthen diestrus

Question 10

after estrus, when can you lyse the CL using lutalyse

Answer 10

between days 5-17. need mature CL

Question 11

estrus control. when doing a double injection method how many days apart do you do it? what does this require

Answer 11

11 days. we need people to heat detect so we know when they go into estrus

Question 12

what is our most commonly used pregestin

Answer 12

CIDR

Question 13

what do we need GnRH administration for

Answer 13

pushes to ovulate or brings up a new wave of follicles when no CL is present

Question 14

OV Synch. when do you give what

Answer 14

GnRH- day 0 (reset waves) monday
PGF day 7 (lyse CL) monday
GnRH day 9 (force follicle to ovulate) wed
breed 12 hours later
4 handling times

Question 15

CO synch. what is it and who for

Answer 15

beef cattle
GnRH- 0
PHG - 7
GnRH AND AI - 9

Question 16

select synch

Answer 16

GnRH- 0 (monday)
PGF- 7
heat detect BID and AI accordingly for day 6-13

Question 17

pre synch

Answer 17

PGF to get all CLs lysed

Question 18

how long are sheep in estrus? goats?

Answer 18

30-36 hr
24-48 hr

Question 19

main ways we manipulate cycles in sru

Answer 19

photoperiodic treatments
male effect
dormitory effect

Question 20

in the male effect when do you breed?

Answer 20

introduce male, then silent estrus, then 17-21 days later obvious estrus (breed then)

Question 21

what is flushing

Answer 21

increase nutrition she that you increase ovulation rates and hopefully cause twinning rates to increase

Question 22

what is a good way to get early transition ewes to come in

Answer 22

give CIDR for at least 14 days and then remove

Question 23

how long should male Sru be left out for natural breeding

Answer 23

1.5 cycles
32 days in goats (21d cycle)
27 days in sheep (17d cycle)

Question 24

when does ovulation occur in estrus of the pig

Answer 24

2/3 of the way through estrus

Question 25

when is average puberty hit pigs

Answer 25

165 days

Question 26

what is our estrus synching strategy in pigs

Answer 26

wean after 21 days and estrus will occur 4-7 days later

Question 27

why are we concerned about synthetic progesterones in pigs

Answer 27

cystic ovarian disease, failure to cycle

Question 28

when can we lyse the CL of pigs with prostaglandins

Answer 28

after day 12