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23 Cards in this Set
- Front
- Back
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T/F The presence of a boar with the sows is to get them to come into heat faster
When do you let gilts see the boar? When is puberty? |
False, he is only there to detect heat
**Moral of the story: You can't short-cycle pigs The gilts are exposed to the boar at 5 months of age, 4 is too young. Puberty at 6 months |
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What is the one hormone given to pigs?
What can it do? |
PG600
It can advance puberty and works great on noncyclic gilts, but it does not do much for cycling animals. |
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How long is a sow's cycle?
T/F a CL is required throughout pregnancy |
21 days
True |
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Why do you wait until the 2nd or 3rd estrus to mate a gilt?
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So she can have time to mature and reach an adequate weight. By the first estrus you want her to be over 250 lbs.
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T/F Transport can induce estrus in a sow
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True, 1/3 of female pigs will come into estrus within week of arrival, 1/4 in the next week, and 1/4 in the next week. The last 1/4 that don't come into heat are your problem pigs.
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How soon after weaning should a sow return to estrus?
What are two reasons these pigs may not go back to cycling? |
7 days
1. They get cystic ovaries 2. They go into anestrus |
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T/F Cystic ovaries in pigs appear to be usually refractory to any treatment and will get bigger with time, not regressing and so they are slaughtered.
For those that can be treated, we give _______ |
True
PG600 |
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What is the #1 factor in estrus in pigs?
#2 and #3? |
#1 Nutrition
#2 Season #3 Lactation length |
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T/F PG600 does nothing for cycling gilts
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True
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T/F The presence of a boar is crucial, even for AI
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True
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T/F Good feed intake (increased over normal) can positively impact the development of next pregnancy's follicles
T/F If a sow does not eat well, you can assume she will not do well in her next pregnancy |
True
True |
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Porcine CL's are refractory to PGF2a until day ______ of the cycle so you can't do anything to change it.
T/F On the other hand, CL's in pregnant animals are very responsive to PGF2a |
12-13
True - you can terminate a pregnancy this way and get them synchronized after they abort. |
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T/F Pregnant pigs are so affected by prostaglandins that fever, sunburn, etc will cause them to abort
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True and odd.
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T/F We can use estrogen in pigs.
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F! As in any other food animal species it is illegal!
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What is the best procedure (drugs) to synchronize pigs?
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PG 600 for 175 days then MATRIX, but it is expensive.
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What is a common mistake made in AI programs on farms that leads to low pregnancy rates/failure?
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Most farmer's are not good at detecting estrus and so they breed at the wrong time.
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T/F Pigs in true anestrus will respond to treatment with PG600
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True; assume PG600 will work any time a pig is not cycling.
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What is probably the #1 hormone used in pigs, it is super cheap and so it is abused.
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Oxytocin: For uterine contractions and milk letdown.
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What are three uses of PGF2a in pigs (all similar reasons)
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1.Terminate a pregnancy (has to be after day 10-12 or so when she is responsive to it)
2.Induce abortion after day 20 3.Terminate a pseudopregnancy |
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T/F Contact with PGF2a and Oxytocin has been known to cause abortions in pregnant female farm workers
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True
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T/F You can freeze boar semen for AI
Supposedly, one boar can service ______ sows on a farm |
False! That's why fresh is often used.
100 |
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Name several reasons why AI may fail:
1. With the semen 2. With delivering the semen 3. With the sow |
1. The semen is old (>72 hrs), it wasn't kept properly, it got contaminated by bad water, bacteria
2. Sow wasn't in heat, not enough semen/sperm 3. Stressing the sow |
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What is the best method to determine pregnancy in a sow (but may be too expensive)
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Ultrasound
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