Free Theriogenology and Animal Reproduction MCQs with Answers
59 Theriogenology and Animal Reproduction MCQs from Veterinary Science, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Covers the reproductive anatomy and physiology of male and female domestic animals, including puberty, oestrous cycles, ovulation, fertilisation, pregnancy, parturition and lactation. It also includes artificial insemination, semen evaluation, pregnancy diagnosis, infertility, dystocia and reproductive disorders, with attention to species differences.
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- A. Progesterone
- B. Follicle-stimulating hormone
- C. Oxytocin
- D. Prolactin
Explanation: The corpus luteum mainly secretes progesterone, which maintains uterine conditions and suppresses further ovulation.
Correct answer: Progesterone- A. Seven days
- B. Twenty-one days
- C. Fourteen days
- D. Thirty-five days
Explanation: The bovine oestrous cycle averages about 21 days, although individual variation occurs.
Correct answer: Twenty-one days- A. Sperm production in testes
- B. Testosterone secretion by Leydig cells
- C. Acrosome reaction and fertilisation
- D. Formation of the corpus luteum
Explanation: Capacitation is a functional maturation process that sperm undergo in the female reproductive tract or an appropriate laboratory medium.
Correct answer: Acrosome reaction and fertilisation- A. Stimulating uterine contractions
- B. Preventing sperm movement in the oviduct
- C. Producing progesterone in the ovary
- D. Penetrating the oocyte coverings
Explanation: The acrosome reaction releases enzymes that help sperm penetrate the zona pellucida surrounding the oocyte.
Correct answer: Penetrating the oocyte coverings- A. The same afternoon
- B. The same morning
- C. The next morning
- D. Two days later
Explanation: The AM-PM rule recommends inseminating a cow during the opposite part of the day from when standing oestrus is detected.
Correct answer: The same afternoon- A. About 150 days
- B. About 340 days
- C. About 283 days
- D. About 230 days
Explanation: Mare gestation averages approximately 340 days, although normal variation is considerable.
Correct answer: About 340 days- A. Long-day seasonal polyoestrous
- B. Non-seasonal monoestrous
- C. Short-day seasonal polyoestrous
- D. Continuous ovulation throughout life
Explanation: Most ewes are short-day seasonal polyoestrous animals, with reproductive activity increasing as day length decreases.
Correct answer: Short-day seasonal polyoestrous- A. A large mature follicle
- B. A softening of the cervix
- C. A reduced rectal temperature
- D. A visible embryonic heartbeat
Explanation: Detection of an embryonic heartbeat by ultrasonography is direct evidence of a living conceptus.
Correct answer: A visible embryonic heartbeat- A. A rise in fetal cortisol
- B. A permanent fall in maternal FSH
- C. A rise in maternal melatonin
- D. A complete loss of uterine prostaglandins
Explanation: In many domestic mammals, increased fetal adrenal cortisol initiates placental and maternal endocrine changes that promote oestrogen…
Correct answer: A rise in fetal cortisol- A. Immediately before the surge
- B. One to three days after the surge
- C. Ten days before the surge
- D. Only after parturition
Explanation: Bitches usually ovulate about one to three days after the LH surge. Their oocytes are released at an immature stage and require additional…
Correct answer: One to three days after the surge- A. Adrenocorticotropic hormone
- B. Thyrotropin-releasing hormone
- C. Gonadotropin-releasing hormone
- D. Growth hormone
Explanation: Gonadotropin-releasing hormone, or GnRH, is secreted by the hypothalamus in pulses.
Correct answer: Gonadotropin-releasing hormone- A. Seminiferous tubules
- B. Bulbourethral gland
- C. Vas deferens
- D. Epididymis
Explanation: Spermatozoa undergo important maturation in the epididymis, including development of progressive motility and fertilising capacity.
Correct answer: Epididymis- A. Prostaglandin F2 alpha
- B. Progesterone
- C. Oestradiol-17 beta
- D. Inhibin
Explanation: Prostaglandin F2 alpha released from the uterine endometrium causes regression of the corpus luteum in the non-pregnant cow.
Correct answer: Prostaglandin F2 alpha- A. Stimulating Leydig cells to produce testosterone
- B. Supporting Sertoli cells and spermatogenesis
- C. Causing ejaculation through smooth muscle contraction
- D. Inducing regression of the testes
Explanation: FSH acts mainly on Sertoli cells within the seminiferous tubules and supports spermatogenesis.
Correct answer: Supporting Sertoli cells and spermatogenesis- A. Diffuse epitheliochorial
- B. Zonary endotheliochorial
- C. Cotyledonary synepitheliochorial
- D. Discoid haemochorial
Explanation: Ruminants have a cotyledonary placenta, with fetal cotyledons joining maternal caruncles to form placentomes.
Correct answer: Cotyledonary synepitheliochorial- A. More than 2 hours
- B. More than 6 hours
- C. More than 24 hours
- D. More than 12 hours
Explanation: In cattle, fetal membranes are commonly considered retained when they remain attached beyond about 12 hours after calving.
Correct answer: More than 12 hours- A. IgG
- B. IgE
- C. IgA
- D. IgM
Explanation: IgG, particularly IgG1 in cattle, is the principal immunoglobulin absorbed from colostrum and provides passive systemic immunity to the…
Correct answer: IgG18. During the first stage of parturition, the principal observable event is which of the following?
- A. Complete expulsion of the placenta
- B. Cervical dilation with uterine contractions
- C. Delivery of the fetus through the birth canal
- D. Involution of the uterus after delivery
Explanation: The first stage involves cervical dilation and increasingly coordinated uterine contractions.
Correct answer: Cervical dilation with uterine contractions- A. Sertoli cells
- B. Peritubular myoid cells
- C. Leydig cells
- D. Epididymal epithelial cells
Explanation: Leydig cells, located in the interstitial tissue between seminiferous tubules, synthesize testosterone in response to LH.
Correct answer: Leydig cells- A. Anoestrus
- B. Cryptorchidism
- C. Freemartinism
- D. Repeat breeding
Explanation: Repeat breeding describes a female that returns to oestrus after repeated services despite apparently normal cycles and no obvious…
Correct answer: Repeat breedingTheriogenology and Animal Reproduction MCQs: common questions
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