发情期
1.Estrus recurs at intervals of approximately six months until late in life.
3.ON THE VOCAL BEHAVIOR DURING THE ESTROUS PERIOD OF THE GIANT PANDA, AILUROPODA MELANOLEUCA
6.Diurnal time budget and activity rhythm of Alligator sinensis in the rutting season
8.THE CHANGES OF THE SEXUAL HORMONE CONCENTRATION IN FEMALE GIANT PANDAS (AILUROPODA MELANOLEUCA)URINE DURING THE ESTROUS CYCLE AND PREGNANCY
10.The female dog reaches sexual maturity at 6-8 months of age, and has two estrus cycles per year.

