All Free Veterinary Science MCQs with Answers

• A. Prostaglandin as a luteolytic agent
• B. Oxytocin as a motility stimulant
• C. Glycerol as a cryoprotectant
• D. Heparin as a capacitation inhibitor

Explanation: Glycerol protects sperm membranes and reduces cellular damage caused by ice formation during freezing and thawing.

• A. A uterine cycle several weeks ahead of the donor
• B. A pregnancy older than the transferred embryo
• C. A corpus luteum absent throughout the cycle
• D. A reproductive stage closely synchronized with the donor

Explanation: The recipient's uterus must be at a stage that matches the age and developmental requirements of the transferred embryo.

• A. Interferon tau to prevent luteolysis
• B. Relaxin to initiate cervical closure
• C. Oestrogen to destroy the corpus luteum
• D. Oxytocin to maintain uterine contractions

Explanation: Bovine conceptus interferon tau suppresses endometrial luteolytic signalling, especially oxytocin receptor expression, thereby maintaining…

• A. Long axis to the long axis of the dam
• B. Head and limbs to the fetal body
• C. Dorsal surface to the maternal pelvis
• D. Placenta to the uterine implantation site

Explanation: Fetal posture describes the disposition of the head, neck and limbs in relation to the fetal body.

• A. Flagellar length and swimming speed
• B. Acrosome size and enzyme activity
• C. DNA content within their nuclei
• D. Mitochondrial number in the midpiece

Explanation: X-bearing sperm contain slightly more DNA than Y-bearing sperm, allowing separation after fluorescent DNA staining and flow-cytometric…

• A. Artificial insemination
• B. Semen collection
• C. Ovarian superstimulation
• D. Embryo transfer

Explanation: Embryo transfer moves an embryo from a donor female to a synchronized recipient female, allowing the recipient to carry the pregnancy.

• A. Posture
• B. Position
• C. Presentation
• D. Gestation

Explanation: An abnormal posture is caused by flexion or deviation of the head, neck or limbs and can obstruct delivery.

• A. Relaxin
• B. Inhibin
• C. Oxytocin
• D. Prostaglandin F2α

Explanation: Granulosa cells release inhibin, which selectively suppresses FSH secretion from the anterior pituitary.

• A. 2 to 4 hours
• B. 20 to 24 hours
• C. 10 to 12 hours
• D. 36 to 48 hours

Explanation: In cows, ovulation generally occurs about 10 to 12 hours after standing oestrus ends.

• A. It degenerates before pronucleus formation
• B. It begins meiosis I again
• C. It changes directly into a spermatozoon
• D. It completes meiosis II

Explanation: The secondary oocyte is arrested in metaphase of meiosis II and completes this division after sperm penetration.

• A. Sertoli cells
• B. Leydig cells
• C. Peritubular myoid cells
• D. Epididymal principal cells

Explanation: Sertoli cells support developing sperm cells, form the blood-testis barrier, and help regulate spermatogenesis.

• A. Uterine lavage
• B. Artificial vagina
• C. Vaginal cytology
• D. Transrectal aspiration

Explanation: An artificial vagina provides suitable temperature, pressure, and collection conditions for semen from a stallion.

• A. Cervix
• B. Vagina
• C. Oviduct
• D. Urethra

Explanation: Early cleavage commonly occurs in the oviduct before the embryo enters the uterus for further development and implantation.

• A. Prolactin
• B. Oestrogen
• C. Progesterone
• D. Oxytocin

Explanation: Suckling stimulates oxytocin release, causing contraction of myoepithelial cells around the mammary alveoli and milk ejection.

• A. Puerperal metritis
• B. Ovarian hypoplasia
• C. Vaginal prolapse
• D. Follicular atresia

Explanation: Puerperal metritis is an acute postpartum infection involving the uterus and is often accompanied by fetid discharge and systemic illness.

• A. To prevent sperm capacitation
• B. To match uterine conditions with embryo age
• C. To increase fetal sex chromosome number
• D. To delay corpus luteum formation

Explanation: The recipient uterus must be at a stage that corresponds closely to the developmental age of the transferred embryo.

• A. Mitosis
• B. Fertilisation
• C. Meiosis
• D. Implantation

Explanation: Meiosis reduces the chromosome number by half and generates genetic variation through recombination and independent assortment.

• A. Nephron
• B. Alveolus
• C. Sarcomere
• D. Osteon

Explanation: The nephron filters blood and modifies the filtrate to form urine. An alveolus belongs to the respiratory system, while a sarcomere and…

• A. Reticulum
• B. Rumen
• C. Omasum
• D. Abomasum

Explanation: The rumen contains microorganisms that ferment plant carbohydrates and produce volatile fatty acids.

• A. Trigeminal nerve
• B. Facial nerve
• C. Vagus nerve
• D. Hypoglossal nerve

Explanation: The vagus nerve carries extensive parasympathetic fibres to the heart, lungs and much of the digestive tract.