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ANSC 108 test review 2
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ANSC 108 test review 2#1 country in swine production - ANS-China
3 Major production systems in beef cattle production - ANS-1) Cow- calf production-
involves cows and heifers mated to bulls, either by natural service or artificial
insemination, to produce a calf crop
2) Stocker operations- utilize available forages or roughages to grow cattle from
weaning until weight-ready for entrance into feedlot
3) Feedlot production- involves feeding high concentrate rations to cattle in a large
confinement facility specifically designed for finishing cattle
Accessory Glands - ANS-1) Vesicular glands: nutrients and buffering
2) Prostate glands: cleanse urethra before ejaculation
3) Bulbourethral glands- help to force semen from urethra at time of ejaculation
Advantages and disadvantages of rotational crossbreeding - ANS-Advantages-
complimentary, hybrid vigor and heterosis, keep replacements
Disadvantages- lower heterosis than the terminal system, reduction in growth potential
and carcass merit
Advantages to using AI(5) - ANS-1) genetic improvement through increased use of
superior sires
2) Disease control- especially STD's
3) improved record keeping
4) eliminates need for bulls kept on farm
5) more economical
All in all out - ANS-completely empties a barn between groups of hogs (all enter and
leave at the same time)
Advantages- allow for cleaning, disinfection and better disease control
Disadvantage- require higher level of management
Animals with less fat.. - ANS-have lower numerical yield grades
Barrow - ANS-castrated male
, Beef check-off fund - ANS-$1/head each time sold, money utilized for research,
advertisement and marketing of beef products
Burdizzo - ANS-bloodless method for castration
Correlation between base width and muscling - ANS-lighter muscled animals tend to be
narrow standing with minimal muscle expressions
Cross-breeding systems - ANS-Rotational system: 3 or 2 breeds rotated, most popular,
replacement gilts kept and used for mating sire breeds
Terminal- offspring marketed, no replacement gilts are kept
Rotaterminal- replacement gilt production (20%), white crossbreed females mated to
colored-breed boars to produce terminal market hog (80%)
Cryptorchid - ANS-where 1 or 2 of the testis remain in the body cavity, heritable trait
Cuts of beef - ANS-round, loin, rib, chuck
Dressing percentage in cattle? (4) - ANS-62%
affected by amount of fill, degree of finish, weight of hide, head shanks and muscling
Dressing percentage of lamb - ANS-52%
low because small ruminants and weight of pelt
Ear notches - ANS-left ear: individual #, right ear: litter #
EPD - ANS-expected progeny difference- predicts difference I performance of future
offspring of a parent, as compared to progeny from other parents, when each are bred
to mates of equal value
Estrogen(4) - ANS-responsible for sexual behavior during estrus, secondary sex
characteristics at time of puberty, relaxes cervix, elevates secretory activity of entire
reproductive tract
Estrous cycle in a cow - ANS-21 days
Factors that influence dystocia - ANS-birth weight of calf, sex of calf, pelvic size of
heifer/cow
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