ANSC 313 Lecture Notes - Lecture 23: Gestation Crate, Schutzhund, Guard Dog
LECTURE 16!
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selection pressure for fast growth to 105 kg market weight!
sellers for animals of higher mature weight , so later-maturing animals!•
selecting for 105kg standard!•
selects for lower fat, since animals are still immature !•
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Yorkshire= large white ( perk eared)!
very good mothers!•
good growth, carcass traits are good!•
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Landrace ( flopped eared)!
good mother!•
good growth, carcass trait good!•
white pig!•
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Duroc!
excellent growth, lean, hardy!•
decreased mothering so terminal sire!•
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Hampshire!
well muscled!•
rapid growth!•
good carcass quality!•
belted up close to the face!•
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Behaviour Genetics
domestication of livestock!•
temperament was critical!•
still a consideration in:!•
dairy cows!◦
horses!◦
sheep!◦
companion animals!◦
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Learned vs. innate!
NOT environmental vs. genetic!•
learned is probably multifactorial!•
innate may be single gene!•
inherit certain neuronal pathways, learn to integrate these into complex behaviours !•
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classical behaviour & genetic studies!
humans- twins raised together and apart!•
rodents- maze running or levers for food!•
chickens- pecking to get food or dust bathing to measure "happiness"!•
pigs- farrowing crate preferences !•
