Related by context. Frequent words. (Click for all words.) 71 estrus 63 mating 60 ovulate 58 reproductive hormones 57 ovulation 55 reproductive tract 55 menstrual cycle 55 ovarian function 54 farrowing 54 matings 54 calving 53 breeding 53 oocytes 53 copulation 53 fertilization 52 Mating 52 oocyte 52 spermatozoa 52 egg laying 52 menses 51 fawns 51 neuronal activity 51 molting 51 mating rituals 50 lactation 50 embryogenesis 50 asexual reproduction 50 reproductive 50 hermaphrodites 50 denning 49 mammary glands 49 neonate 49 molt 49 female hormone estrogen 49 lactating 49 menstrual cycles 49 rutting 49 lambing 49 foaling 49 replacement heifers 49 menstruate 49 coitus 49 gestational 48 habituation 48 mammary gland 48 reproductive biology 48 ovulating 48 unfertilized eggs 48 hormone 48 calves 48 ectopic 48 preconditioning 48 thyroid hormones 48 rhesus monkeys 48 calve 48 progesterone 48 gestation 47 hormones 47 insemination 47 intrauterine 47 forage 47 insect populations 47 mating ritual 47 telomerase activity 47 hormone progesterone 47 Lun Lun 47 mouse embryos 47 ejaculate 47 rumen 47 gametes 47 aromatase 47 uterine 47 eggs hatch 46 nestlings 46 pupae 46 forages 46 littermates 46 germ cells 46 ungulates 46 pubertal 46 germline 46 meiosis 46 ovary 46 somatic cells 46 breeding herd 46 embryo 46 copulate 46 reproductive organs 46 artificial insemination 46 colostrum 46 foraging 46 somatic cell 46 hormonal 46 pregnant mares 46 larval stage 46 pheromones 46 perimenopause 46 fruiting 45 fecundity 45 transgene 45 rhesus macaques