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VMED 155 THERIO LEC > TOPIC 1:PUBERTY > Flashcards

TOPIC 1:PUBERTY Flashcards

1
Q

Among females of the domestic species, puberty precedes the development of physical maturity

A

true

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2
Q

as puberty starts, their efficiency, particularly with respect to their fecundity (number of offspring), has not reached its maximum.

A

true

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3
Q

Primordial follicles (each contain__ w/ single layer of____

A

oocyte
granulosa cells

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4
Q

age of puberty of mare

A

1-2 yrs

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5
Q

age of puberty of cows

A

7-18 mos

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6
Q

puberty age of doe or nanny goat

A

4-8 mos

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7
Q

puberty age of ewe

A

6-15

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8
Q

puberty age of bitch

A

6-20mos

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9
Q

puberty age of queen cat

A

7-12 mos

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10
Q

pgymy goats reach puberty at

A

3mos

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11
Q

Initiation of puberty is a function of

A

age, maturity

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12
Q

Signalled by 1st estrous or 1st ovulation

A

onset of puberty

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13
Q

Cows ovulate during what stage of estrous

A

metestrus

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14
Q

chickens mature at 1__wks

A

18

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15
Q

animals that are seasonally polycyclic

A

mare, ewe, doe/nanny ,cat

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16
Q

seasonally monocylic animals

A

bitch

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17
Q

what causes the changes during puberty

A

pdtn of female gametes
synthesis of hormones

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18
Q

cockerels mature at ___ mos

A

4-5 mos

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19
Q

Hormone primarily associated with onset of ovarian cylicity, hence puberty is

A

LH

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20
Q

LH is secreted by

A

pituitary gland

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21
Q

The endocrine trigger for puberty is based on sex steroid feedback regulatory mechanisms, which operate at the level of the tonic or surge centres of the hypothalamus

A

true

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22
Q

Puberty onset relies on the secretion of ovarian ___ so that the circulating concentration is sufficient to stimulate a preovulatory ____ and ___

A

oestradiol
gonadotrophin-releasing hormone (GnRH) and LH surge.

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23
Q

pulsatile LH leads to peak production T/F

A

false only flashing

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24
Q

there is LH surge in prepuberty T/F

A

false

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25
Q

during/or after puberty, this is highly produces that stimulates estradiol pdtn

A

LH

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26
Q

what hormones are high during puberty

A

LH,FSH, E2

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27
Q

what secretes estrogen

A

granulosa cells

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28
Q

theca cells produces what hormone

A

progesterone

29
Q

what produces LH

30
Q

signs og puberty in males

A

behavior
age of 1st ejaculation
quality of ejaculate

31
Q

Puberty in male occurs as a result of a decrease in hypothalamic sensitivity to ___ and ___

A

E2 and testosterone

32
Q

non seasonal polycyclic animals

33
Q

Seasonal but can be “switched on” when there is increasing day length

34
Q

short day breeders

35
Q

Movement allows pheromones to be concentrated on the vomeronasal organ

36
Q

what causes the changes during puberty in females

A

pdtn of female gamtes
snthesis of hormones

37
Q

High____ production stimulates estradiol production

38
Q

hormones produced during puberty

39
Q

In the male the rise in LH begins earlier than in the females

40
Q

in males, low concentration of ___ crosses the BBB and is converted to ___ by ____

A

testosterone
estradiol
aromatase

41
Q

both estradiol and testoterone has a ____ feedback effect on hypothalamic GnRH

42
Q

as tramsition to puberty begins, the sensitivity of the hypothalamic neurons to estradiol increases

A

false. reduced ung dulo

43
Q

influences the release of LH, FSH and prolactin

44
Q

source of melatonin

A

pineal gland

45
Q

kisspeptin influences the release of ___

46
Q

leptin is secreted by

47
Q

Animals with good growth rate attain puberty before those with slow growth rate

48
Q

Giving high amounts of Carbohydrates (feed) to sows to induce hyperovulation

49
Q

pedigree cats are more sensitive to seasons

50
Q

puberty age of small breed dogs

51
Q

puberty age of large breed dogs

52
Q

dog breeds affected by season

A

basenji, tibettan

53
Q

puberty age of cats

A

by wt. females : 2.3-2.5
males: 3.5 kg

54
Q

Isolation triggers estrus in goats and does

55
Q

puberty age of pigs

56
Q

all pigs are affected by seasonality

57
Q

gilts/pigs must delay until 2nd heating to increase ovulation T/F

A

false. 3rd estrus

58
Q

target wt of cows to be ready for breeding

A

65-67% of mature weight

59
Q

one example of Determinant of seminal quality and quantity

A

scrotal circumference

60
Q

is a cursor for measurement of scrotal circumference

A

central bar

61
Q

buffaloes have wider scrotal circumference that bulls

A

bulls>buffaloes

62
Q

puberty age of stallions

63
Q

animals where 1st ovulation is not preceded by behavioral oestrus

64
Q

ewes can be bred in PH all year round

65
Q

Other external factors influencing puberty

A

nutrition, climate, proximity to male, dz

66
Q

flushing in pigs is giving feed with high ___ content to trigger hyperovulation

67
Q

melatonin influences the release of what hormones

A

lh, fsh, prolactin

68
Q

absence of male triggers the estrus in ram/buck effect

69
Q

Common phenomena in cattle:

A

Subestrus or silent heat

VMED 155 THERIO LEC (6 decks)

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