Swine 2

Question 1

system of mating animals used to produce pure breed or a crossbreed

Answer 1

breeding system

Question 2

breeding closesly rwlated animals done to purify bloodline. not recommended but not always not disadvantageous

Answer 2

inbreeding

Question 3

system of breeding where animals of the same breed are mated to each other results to purebreds. avoids inbreeding

Answer 3

pure breeding

Question 4

breeding two animals from different breeds a.) to obtain hybrid vigor b.) bring together desirable characteristics

Answer 4

crossbreeding

Question 5

example:
large white x landrace
pietrain x duroc

Answer 5

two-way-cross-mating with the use of 2 diff. breeds

Question 6

example:
LW x landrace (1st cross or F1)
D x LW/landrace (2nd cross)
D/LW/landrace (progeny) 2nd cross/F2

Answer 6

three-way-cross-mating with the use of three diff. breeds

Question 7

example:
P x D LW x landrace
P/D x LW/landrace
P/D/LW/landrace

Answer 7

four-way-cross-mating with the use of four different breeds

Question 8

system of breeding where an inferior breed is improved by continued crossing

Answer 8

upgrading

Question 9

are systems of mating used to produce pure breed or a crossbred

Answer 9

breeding system

Question 10

breeding of closely related animals done to purify bloodline. not recommended but not always not disadvantageous

Answer 10

inbreeding

Question 11

increasing estrogen secretion as the oocyte and follicle matute towards ovulation

Answer 11

follicular phase (5-7 days)

Question 12

increasing progesterone from development of corpus luteum (commonly reffered to as the yellow body)

Answer 12

luteal phase (13-15days)

Question 13

stage where estrogen and FSH are secreted increasing in preparation for estrus. small pulses of LH also begin to released

Answer 13

1. follicular phase proestrus (d 17 to 21)

Question 14

stage where oocyte has reached maturity. estrogen and LH secretion peaks causing follicle to rupture and ovulation to occur

Answer 14

2. estrus (d 0 to 1)

Question 15

estrogen, LH and FSH have all declined and female is no longer receptive to the boar. the ovarian follicle which released the oocyte begin the process of luteinization to become the crpus hemorrhagicum and then corpus luteum. with the formation of CL, or ‘yellow body’ progesterone secretion begins

Answer 15

3. luteal phase metestrus(d 2-4)

Question 16

longest stage.recognition of pregnancy happens. during this stage progesterone continues to increase around day 12 of gestation. at this time, presence of viable embryo enables pregnancy to persist. if no viable oocytes are detected by day 15, prostaglandin F2 alpha will act upon the CL causing it to regress and reduce secretion of progesterone

Answer 16

4. diestrus