LA repro stuff Flashcards

1
Q

normal bovine estrus length?

behavior length?

A

24 hr

7 or 12-18 in beef

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2
Q

what is the goal calving interval

A

13 month

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3
Q

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

A

60-80 days

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4
Q

how long do you expose a bull to beef cows

A

60-75 days

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4
Q

what are three ways to detect estrus

A

direct observation, detection aids, hormonal assessment

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4
Q

what can affect heat detection

A

weather, stress, malnutrition

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4
Q

efficiency and accuracy

A

efficiency is how good you are at catching those in heat

accuracy is are you calling false positives

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5
Q

what is a heat detection rate

A

bred/eligible in a 21 day period

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6
Q

AM PM rule in ruminants

A

if she is in estrus in AM, breed in PM

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7
Q

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

A

24-32 hours

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8
Q

when does oculation occur once estrus has begun in sows

A

36-44hrs

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9
Q

what shortens luteal phase?
what lengthens the luteal phase?

A

prostaglandins shorten
progestins lengthen diestrus

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10
Q

after estrus, when can you lyse the CL using lutalyse

A

between days 5-17. need mature CL

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11
Q

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

A

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

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12
Q

what is our most commonly used pregestin

A

CIDR

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13
Q

what do we need GnRH administration for

A

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

14
Q

OV Synch. when do you give what

A

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

15
Q

CO synch. what is it and who for

A

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

16
Q

select synch

A

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

17
Q

pre synch

A

PGF to get all CLs lysed

18
Q

how long are sheep in estrus? goats?

A

30-36 hr
24-48 hr

19
Q

main ways we manipulate cycles in sru

A

photoperiodic treatments
male effect
dormitory effect

20
Q

in the male effect when do you breed?

A

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

21
Q

what is flushing

A

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

22
what is a good way to get early transition ewes to come in
give CIDR for at least 14 days and then remove
23
how long should male Sru be left out for natural breeding
1.5 cycles 32 days in goats (21d cycle) 27 days in sheep (17d cycle)
24
when does ovulation occur in estrus of the pig
2/3 of the way through estrus
25
when is average puberty hit pigs
165 days
26
what is our estrus synching strategy in pigs
wean after 21 days and estrus will occur 4-7 days later
27
why are we concerned about synthetic progesterones in pigs
cystic ovarian disease, failure to cycle
28
when can we lyse the CL of pigs with prostaglandins
after day 12
29