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In the wild, only a small percentage, if any, of the litter may survive to maturity, whereas for domesticated animals and those in captivity with human care the whole litter almost always survives. Kittens and puppies are in this group. Carnivorans, rodents, and pigs usually have litters, while primates and larger herbivores usually have ...
Drawing of the head of a four-week-old human embryo. From Gray's Anatomy. Embryo drawing is the illustration of embryos in their developmental sequence. In plants and animals, an embryo develops from a zygote, the single cell that results when an egg and sperm fuse during fertilization. In animals, the zygote divides repeatedly to form a ball ...
Puppies generally weigh 8–16 oz (0.23–0.45 kg) shortly after birth, depending on the breed. [1] A puppy's coat color may change as the puppy grows older, as is commonly seen in breeds such as the Yorkshire Terrier. Puppy refers specifically to young dogs, [2] while pup may be used for other animals such as wolves, seals, giraffes, guinea ...
Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process naturally occurs with all sexually mature female mammals, although it may predate mammals. [1] The process of feeding milk in all female creatures is called nursing, and in humans it is also called ...
During the third stage of labor, the time between the delivery of the baby and the passage of the placenta, and the fourth, the final stage of birth, excessive blood loss can endanger the life of the mother. When the newborn nurses the mother secretes oxytocin which causes the uterus to cramp and reduce blood loss. Nursing also causes the ...
It was suggested that nesting animals, who would then rear their young within the nest, benefited by having an aseptic area. Further, predators would be attracted to the site of parturition by the scent of blood and of fetal tissue, so ingesting the afterbirth would eliminate the ability for predators to easily locate newborns.
From time of weaning until the puppy reaches 40% of the adult body weight, the optimal energy intake per unit body weight is twice that of an adult dog of the same breed. [7] From 40% to 80% of adult body weight, energy requirements decrease to 1.6 times the adult requirement, and from 80% to the end of growth, this decreases further to 1.2 ...
A litter consists of the puppies born from the same pregnancy. A whelp is a newborn puppy and giving birth to dogs is called whelping. Dogs commonly give birth in a whelping box, a simple box or pen provided to the dam to help shelter and contain the puppies. A person who intentionally mates dogs to produce puppies is referred to as a dog breeder.