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Across 1. stage of life when an animal is sexually mature; can now reproduce 4. developing zygote that implanted into the uterus 7. when the testicles do not descend from the body cavity and the male is infertile 9. difficulty in birthing 10. male gametes or sex cells 13. hormone that stimulates the estrus period to occur 14. starts the process of ovulation and aids in the maintenance of pregnancy 16. period that immediately follows estrus lasts about two days 18. gland that produces a thick fluid that aids in the motility of sperm 20. having only one estrous cycle in a breeding season 21. develops secondary sex characteristics and distinguishes males from females 25. having multiple estrous cycles in a a breeding season 29. the act of mating 30. sex cells 31. hormone that stimulates uterine contractions at the start of parturition and the letdown of milk by the mammary system 32. heat period; time when female is receptive of the male for breeding 33. body thinks it is pregnant and estrus doesn't occur; big change in hormone levels 34. fluid from a male that contains sperm and other accessory fluids 35. maintenance hormone during pregnancy prevents estrus

Down 1. stimulates milk production and maternal behaviors 2. the production of milk after giving birth 3. triggers the release of estrogen and the start of ovulation 5. cell division that results in growth in size 6. production of sperm in male animals 8. introduction of semen into the female reproductive tract 11. length of pregnancy 12. glands that secretes a thick mucus that serves as a lubricant for semen to be released 15. the production of gametes (sperm and ova) 17. time from one estrus to the next 18. period immediately before estrus in females 19. the act of giving birth 22. male with only one fertile testicle 23. production of sex cells 24. interval of sexual inactivity between two periods of estrus in female animals 26. the release of an egg (ova) from the ovary 27. production of oocytes (ova/eggs) in female animals 28. fertilized egg cell