Reproduction of dogs in the tropics

摘要: Dog overpopulation is considered a serious problem in developing countries and threat to human health. To be successfully implemented, official dog control measures have accordance with regional beliefs practices of an area. For these reasons local municipal authorities, veterinarians owners need information about the structure, size, dynamics growth canine population, as well prevalence reproductive diseases. They also informed methods for reproduction this species. The aims thesis were provide information, test non-surgical method castration male dogs. It was found that dogs are popular pets urban rural Yucatan 72.8% households Merida owning 63.3-71.1% communities, respectively. Households medium socio-economical status, large families adequate fences more likely own In city provided better husbandry, health care feeding their This reflected lower mortality rate unwanted matings litters. Free roaming or communities may reproduce maximal capacity. evident due less supervision, only 1.8% neutered spayed, compared 3.1% city. veterinary practitioners did little promote breeding reduce relinquishing Better client education promoting sterilization at low cost would improve situation. Female under tropical conditions cycle throughout year but marked increase December. Females estrus attract males testosterone concentration increased during those periods. Healthy constantly produce viable sperm capable impregnating receptive female. Pregnant bitches, therefore, can all through year. During periods high environmental temperature, however, percentage pregnant females lower. Underweight animals become pregnant. Ovulation influenced by climatic tropics, higher number oocytes being ovulated summer time. Although temperature modify seminal traits morphology dogs, changes grade remain fertile Day length probably induced circannual prolactin secretion physiological role hormone incompletely known. A induce seasonal subfertility embryo resorption. Epidemiological data revealed genital pathologies both sexes. most frequently not adversely affect capacity come into males, seem spermatogenesis, depending on amount testicular interstitial tissue damaged production affected. Aged expected, risk suffer degeneration develop tumors. new neutering evaluated alternative surgical mass sterilization. Crushing spermatic cord leads vascular damage cellular hypoxia testis and, consequently, infarction. proved quick, efficient cost, minimal patient. However, long-term studies needed prove it has no adverse reactions.