ANBI 360.3 Lecture Notes - Lecture 29: Estrous Cycle, Uterine Atony, Brucellosis
20 Jun 2018
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LECTURE 29!
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reproductive issues!
puberty in dogs!
onset of first heat between 6 & 15 months!•
first viable sperm production usually by 12 months!•
varies by barred, smaller sooner!•
increased time between heat can also occur!•
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reproduction and development in cats!
sexual maturity occurs between 7 and 12 months!•
body weight is the most important factor in determining age at sexual maturity!•
females are capable of breeding at approx 2.5 Kg!•
queens can produce litters until 8-10 years of age!•
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reproduction in tom cats!
males reach maturity about 1-2 months later then the female!•
body size of 3.5 Kg us considered sexually mature!•
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male reproductive problems!
frozen testicles ( >60 day loss of viable sperm)!•
steroids affect testicle size ( i.e prednisone for allergies)!•
brucellosis- bacterial infection that renders a male sterile !•
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too old?!
males sperm count declines by 9 years!•
females not bred by 5, may have greater risk of whelping problems!•
most bitches retired about 6 years!•
is uterine inertia more likely in older females?!•
the uterus does not respond well to hormones leading to contractions!◦
slowness during the whelping!◦
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canine heat cycle!
approximately every 6 months in domestic dogs!•
sometimes from last heat, sometimes from whelping or weaning!•
lasts about 3 weeks!•
bitch receptive middle week!•
heat cycles can vary in length !•
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dormitory effect!
one female in heat, causes heat cycles to begin in other females!•
litter would be closer together than ideal in a kennel with multiple litters/ year!•
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how often!
skip a heat between whelping!•
larger litter!◦
healthier pups!◦
improved longevity for bitch!◦
wild canids have one litter per year !•
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