AGR 506 Exam 3 Latest Update

AGR 506 Exam 3 Latest Update What maternal factors affect gestation length? - ANSWERAge; younger and older have shorter pregnancies because they fill capacity faster What 2 organs are bi-passed in fetal circulation? - ANSWERlungs and the liver How can calf dystocia best be controlled? - ANSWERchoose a bull that throws smaller calves What are advantages of AI? - ANSWERgenetic improvement; rapid proof of sire; improves reproductive efficiency; disease control; more economical; safer; sires more available; crossbreeding How much ejaculate would you expect from a horse? - ANSWER30-200mL How much ejaculate would you expect from a bull? - ANSWER3-8mL How much ejaculate would you expect from a dog or cat? - ANSWER0.1-2mL; 0.5-12mL How much ejaculate would you expect from a boar? - ANSWER125-250mL How much ejaculate would you expect from a ram? - ANSWER0.5-2mL What is the sperm rich portion of ejaculate? - ANSWER1/3 of ejaculate; 1-4mL; milky What are external signs of approaching parturition? - ANSWERedema of vulva; pelvic ligaments relax; mammary gland enlargement and secretions; nesting; change in abdominal size; isolation from the herd What are internal signs of approaching parturition? - ANSWERcervix softens; cervix dilates; vaginal tract relaxes; fetus shifts position; contractions What are internal signs of estrus? - ANSWER"slippy-slidey"; What is the best way to collect a bull's semen? - ANSWERartificial vagina What parameters should be maintained in an artificial vagina? - ANSWERsize, pressure, lubrication, temp When is uterine involution normally completed? - ANSWER1 week post-partum How long does farrowing normally take in the sow? - ANSWER30 minutes to a couple hours How can you assist a sow with uterine inertia? - ANSWERoxytocin injections, moving the female, or cooling her off What are ways to perform sperm counts? - ANSWERmicroscopically What is the most important individual quality test for a bull's sperm? - ANSWERprogressive motility What is the temperature of liquid nitrogen? - ANSWER-320 F or -196 C