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4-6 Weeks: During this phase, you may notice changes in appetite, energy levels and body shape. The abdominal area will begin to swell and nipples will take on different characteristics.
The average length of the reproductive cycle for females is 2–4 weeks. Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. [5] 1.
Diagrams to show the development of male and female generative organs from a common type. A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction. 3. Ureter. 4. Urinary bladder. 5. Urachus. cl. Cloaca. cp. Elevation which becomes clitoris or penis. i. Lower part of the intestine. ls.
In mammals, the term refers chiefly to the early stages of prenatal development, whereas the terms fetus and fetal development describe later stages. [2] [4] The main stages of animal embryonic development are as follows: The zygote undergoes a series of cell divisions (called cleavage) to form a structure called a morula.
In the female fetus, the tubercle is attached to the vestibular folds that remain unfused forming the labia minora and the vaginal vestibule in between. [7] The genital tubercle is sensitive to dihydrotestosterone and rich in 5-alpha-reductase , so that the amount of fetal testosterone present after the second month is a major determinant of ...
Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
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Cryptorchidism is common in male dogs, occurring at a rate up to 10%. [19] This condition is one of the most common congenital defects in purebred dogs (11%), with 14% reported in Siberian Huskies. [20] Although the genetics are not fully understood, it is thought to be a recessive, and probably polygenetic, trait. [21]
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