Mating Systems Flashcards
It involves bringing the boar to make an in heat gilt or sow or vice versa and then separating the two after mating.
Natural mating
Handmating is practice for following reasons
*Allows producers to easily identify which sow or gilt is bred and which is not
*Permits the prediction of the farrowing date
*Allows producers to easily determine the reproductive performance of the sow
What are the limitations of artificial insemination
•Properly trained technician
•Difficulty in storing diluted bores semen over a prolonged period
•Success of ai depends largely on the accuracy of heat detection and subsequent timing of insemination and the part of a properly trained technician
•Proper handling of semen before and during insemination
•Should always be a guiding principle that guilts or saw which cannot conceive following service of a normal bore will not perform any better when artificial inseminated
Advantages of artificial insemination
•Increases the numbers of cells that can be served by the boar
•Eliminates injuries
•Reduces the spread of sexually transmitted diseases
•Allows more racers to keep a few cells without maintaining a boar
•Access for breeding distantly located females more conveniently and with less transport cost
The training of boars normally starts at around_______
6 ½ to 7 months of age
Boars differ in ____
Characteristics and attitude
In training the boars remember the following
•Differ in characteristics and attitude
•Check some and quality and quantity
•Abnormalities like small testicles and insufficient erection
Procedure in semen collection
Clean dry and warm collecting cup covered with filter
Hands should be washed and dried
Introduce the boar to the dummy in the collection pen
Allow the boar to mount the dummy saw in its own time
Pressure exerted in gripping the penis
It occurs once the bohr’s penis is locked in the hand and the bor relaxes
4 phase ejaculation process
The ejaculation process takes_____ to complete
5 to 10 minutes
Signal the end of ejaculation
Large amount of gel
It is up to 250 ml clear seminal plasma free of spermatozoa and gel is secreted from the accessory glands
Fourth phase POST SPERM FRACTION
It consists of clear seminal fluid some gel and dead sperm cells and is heavily contaminated with bacteria and this should not be collected
First phase the pre sperm fraction
Is about 80 ml in volume and grayish in color due to the lower density of spermatozoa
Third phase
Is around 50 ml in volume creamy white in color and contains the greatest density of spermatozoa it is collected in the prewarmed thermos or cup
Second phase the sperm rich fraction
Contains the greatest density of spermatozoa
Second phase or the sperm rich friction
A mature boar should produce 75 to 150 ml sperm rich semen per ejaculation
Volume
Physical parameters of semen
Color
appearance
smell or odor
An ejaculate that has been contaminated with perpetual fluid has a ______
Very distinctive odor
What are the microscopic parameters of semen
Concentration
motility
morphology
_____ of the sperm cell should exhibit a progressive movement
70%
The sperm concentration should be at least_____
3 B spz, / dose 100 ml
A concentration of _____ is recommended during summer months to compensate for lower production due to heat stress
6 B spz
The semen should contain at least _____normal sperm cells
75%
