Livestock Management The embryo houses itself in the


RANCHING


uterine horn nearest the ovary that produced the ovulating follicle. An embryo found in the right horn came from an egg produced by the right ovary, and vice versa. For this reason, particularly in cows that are open or maybe in the early period of gestation, you must palpate both uterine horns.


Developmental stages of the calf “There are 3 main periods of


development in a young calf’s life,” said Carpenter. “The period of the ovum is the time from fertilization until the egg has divided enough times to take on a particular form. This occurs on approximately the thirtieth day when there is enfold- ing of developing egg layers. At this stage the newly developing animal is called an embryo.” The period of the embryo lasts


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until fetal membranes begin to at- tach to the uterus lining, which takes approximately 38 days. Dur- ing the embryonic stage, develop- ment of various organs and sys- tems are initiated. These include the respiratory, nervous, digestive, circulatory and reproductive sys- tems. As the embryo develops, it fl oats freely in uterine milk in the uterine cavity. The fetus period begins when the


embryo is approximately 38 days old and ends when the newborn is expelled at parturition, or birth. During the fetus stage, continued attachment takes place at the nu- merous caruncles lining the uterus. These attachments provide transfer of nutrients and waste materials for the developing fetus. Birth occurs approximately 280


days after fertilization and that par- ticular reproduction cycle is com- pleted.


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