10. Reproductive Cycles Annual Breeding Cycles Continuous breeders Breeds throughout the year e.g., human,. guinea pig, rat. Seasonal breeders Breeds during specific seasons e.g., dog , cat, sheep. cattle Oestrus cycle Females sexually receptive during heat period e.g., cow, rat, pig Menstrual cycle Periodical discharge of menstruation e.g., monkeys. Ape, man