SUBJECT INDEX 



1555 



Lactation (cont.) 



parathyroids and, 618-619 



parturition and onset of, 1325 



phases, 591 



progesterone and, 614-61 (> 



prolactin levels, 205 



rat, pars nervosa ablation and, 1147 



reviews, 591 



selective breeding and, 1355 



suckling and maintenance of, 1325-1330 



suckling-induced, mechanism, 1329-1330 



temporal relation to parturition, 1325-1326 



terminology, 591, 606, 609, 619-620 



thyroid hormone and, 617-618 



tranciuilizing drugs and, 631-632 



udder denervation and, 626, 630 

 Lactic dehydrogenase, in semen, 392 

 Lactic dehydrogenase -DPN oxidase, estrogen 



and, 656 

 Lactogen (see also Prolactin) 



ascorbic acid depleting action, 531 



cholesterol-depleting action, 531 



luteotrophic action in rats, 532 



secretion, oxytocin stimulation of, 537 

 Lactogenesis (initiation of secretion), 606-609 



biochemical correlates, 607-609, 613 



Cortisol and, 606 



estrogen and, 606-607 



milking stimulus and, 607 



pregnancy and, 606-607 



progesterone and, 606-607 



prolactin and, 606-607, 1327-1328, 1330 



somatotrophin and, 606 



suckling and, 607 

 Lagomorpha 



female prostate, 374 



male accessory reproductive glands and homo- 

 logues in female, 368 



ovum, mucous coat, 815, 823 



placental type, 908 



prostate, type, 369, 372 

 Lamna cornubica, viviparity, 1057 

 Lamprey (see Petromvzon) 

 Langhans cells, 890, 892, 894, 895, 898, 910-911, 926 



age changes, 903 



distinction from peripheral trophoblasts, 904 

 Laniidae 



incubation, temporal relation to egg-laying, 

 1284 



nest -building, temporal relation to egg-laying, 

 1273 

 Lanius coUurio, nest-building, role of sexes, 1270 

 Lanius ludovicianus, maturation of behavior, 



amount of care and, 1356 

 Lanosterol, and cholesterol biosynthesis, 644-645 

 Lapemis, ovoviviparity, 1057 

 Larinae 



displacement nest-building, 1272 



egg-laying 



brooding and suppression of, 1283 

 l)attern, 1277 



incubation, 1284 

 patch, 1287 

 temporal relation to egg-laying, 1285 



nest -building, correlation with copulation, 1271 



pair formation, 1242 



parental behavior, 1353, 1356 

 role of the sexes, 1299 



prccocial yovmg, 1298 

 Lanis argenlatus 



aggressive behavior 

 androgen and, 1254 

 breeding cycle and, 1251 



egg-laying pattern, 1283 



interruption of incubation and, 1297 



Larus argentatus (cont.) 



feminine behavior by male, estrogen and, 1195 

 incubation 



behavior, presence of eggs and, 1294 

 temporal relation to egg-laying, 1285 

 mating behavior, female, androgen and, 1197 

 nest, 12()9 

 nest-building 



correlation with follicular growth, 1274 

 displacement type, 1351 

 help of male and, 1276 

 role of sexes, 1270 

 ovarian follicular growth, 1273 

 parental behavior, specificity, 1337 

 releasing mechanisms, 1403 

 Larus atricillu feminine behavior by males, estro- 

 gen and, 1195 

 Larus californicus 



hypophyseal hormones, prolactin, 1101 

 incubation 

 patch, 1288 

 prolactin and, 1102 

 prolactin level, 1128, 1190 

 Larus can)(s, incubation, problem of effectiveness, 



1285 

 Larus fuse us 



ovarian follicular growth, 1273 

 sperm, 1096 

 Larus novae -hollandiae, nesting behavior, inherent 



cycles, 1141 

 Larus occidentalis , regulation of body tempera- 

 ture, in nestlings, 1356 

 Larus ridihundus 

 bill color, androgen and, 1091 

 egg-laying pattern, 1277, 1283 

 incubation, temporal relation to egg-laying, 



1285 

 nest -building 



"displacement" type, 1351 

 role of sexes, 1270 

 Lathyrus odoratus, lithospermin content, 692 

 Laticauda, ovoviviparity, 1057 

 Laurence-Moon-Biedl syndrome, chromosome id- 



iogram, 65 

 Learning (see Experiential factors) 

 Lebistes relic ulat us 

 chromosomes 



and sex determination, 45-46 

 pattern, 45 

 corpus luteum, 1058 

 genital tract 

 development, 1060 

 gonadal hormones and, 1069, 1070 

 gonads, estrogen and, 1070 

 gonopodium in females, androgen and, 1046 

 gravid spot, androgen and, 1046 

 growth, androgen and, 1045-1046 

 hermaphroditism, 1063 



intraovarian embryogenesis, thyroid and, 1057 

 intraovarian fertilization, 1054 

 masculine behavior bv female, androgen and, 



1196 

 mating behavior, male, 1175 



methods of scoring, 1177 

 parthenogenetic development, 1070 

 sex determination, 25 



sex reversal, gonadal hormones and, 1067, 1184 

 skin coloration, androgen and, 1046 

 source of androgen, 1038 

 sperm storage in female, 1055 

 spermatophore formation, 1036 

 testis, testosterone and, 1069 

 Leeches, sperm, penetration of somatic tissue, 



748 

 Lefua, hermaphroditism, 1063 



