Ansc 3040 Final Review Questions With Answers.

ANSC 3040 Final Review QUESTIONS
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Largest cost in Dairy Heifer Production? - CORRECT
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ANSWERS ✔✔Nutrition/Feeding |\




2nd Largest Cost in Dairy Heifer Production? - CORRECT
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ANSWERS ✔✔Replacement Heifers |\ |\




When is Timed AI good? - CORRECT ANSWERS ✔✔When
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estrous detection is less than 70% because timed AI does
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not require ED
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When do we want puberty in dairy heifers? - CORRECT
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ANSWERS ✔✔9-10 months of age/260-280 kg, feeding
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and body weight are important factors for onset of
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puberty


When do we want 1st AI? - CORRECT ANSWERS ✔✔3rd
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estrous


When do we want pregnancy? - CORRECT ANSWERS
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✔✔13-15 months (350-380 kg) |\ |\ |\

,When do we want calving? - CORRECT ANSWERS ✔✔22-
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24 months (600-640 kg pre calving weight)
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What data should be monitored? - CORRECT ANSWERS
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✔✔BCS, weight, activity level |\ |\ |\




How should we collect data? - CORRECT ANSWERS
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✔✔either snapshot method where measure groups at
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different stages (less accurate) or longitudinal where
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measure group of heifers every day (accurate)
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Which is worse over-feeding or under-feeding before
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puberty? - CORRECT ANSWERS ✔✔Both are bad, |\ |\ |\ |\ |\ |\ |\



overfeeding results in poor performance and |\ |\ |\ |\ |\ |\



underfeeding results in delayed puberty/anestrous |\ |\ |\ |\




Optimal ED rate? - CORRECT ANSWERS ✔✔more than
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70%


Goal of Beef Cattle Production - CORRECT ANSWERS
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✔✔Maximize quality and quantity of calves |\ |\ |\ |\ |\




What are the early embryonic development steps that are
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conserved? - CORRECT ANSWERS ✔✔1. Ootid 2. syngamy
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-> zygote 3. early blastocyst (2, 4, 8 cell) 4. Morula (can't
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, cells anymore) 5. ICM and trophectoderm differentiation
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6. Hatching 7. Hatched
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What happens at the early blastocyst stage? - CORRECT
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ANSWERS ✔✔Activation of embryonic genome and |\ |\ |\ |\ |\ |\



regression of maternal genome (8 or 16 cell in cows, 4
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cell in humans and pigs, 2 cell in mice)
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How does an embryo hatch? - CORRECT ANSWERS
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✔✔enzymes from inside blastocyst are activated to |\ |\ |\ |\ |\ |\ |\



degrade, cell grows quickly, fluid accumulates inside
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which increases pressure and eventually zona pellucida
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breaks


True or False preimplantation occurs in all species? -
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CORRECT ANSWERS ✔✔False: not in humans, primates,
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rodents


What occurs during preimplantation? - CORRECT
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ANSWERS ✔✔conceptus elongates rapidly, becoming a
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filament (except not in mares; it remains spherical)
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What's the difference between hemotroph and
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histotroph? - CORRECT ANSWERS ✔✔histotroph supplies |\ |\ |\ |\ |\ |\



nutrients to embryo prior to implantation in uterus
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(uterine milk) |\