All Free Veterinary Science MCQs with Answers

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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…

• 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…

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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…

• 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.

• 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.

• 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…

• A. Granulosa cells
• B. Theca interna cells
• C. Luteal cells
• D. Germinal epithelial cells

Explanation: Granulosa cells contain aromatase, which converts theca-derived androgens into oestrogens under FSH influence.

• A. Infundibulum
• B. Ampulla
• C. Isthmus
• D. Uterotubal junction

Explanation: The ampulla is the usual site where the ovum and sperm meet and fertilisation occurs.