ANSC 101 Lecture Notes - Lecture 2: Passive Immunity, Cloaca, 100 Feet
3 Dec 2016
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Keep animals out of heat and extend estrous cycle (progestins: melengestrol acetate (mga, controlled intervaginal drug release devices (cidr) Bring females into heat and shorten estrous cycle (pgf2alpha: lutalyse, in-synch. Cause ovulation or start new follicular wave (gnrh: facetrel, ovacyst. Placentation: development of an exchange system between dam and fetus (the placenta will also serve an important endocrine role) Cl continues to function: progesterone remains elevated, no estrus cycles or heat. 25-40% of all pregnancies in farm animals are not carried to term. Elimination of unfit genotypes (90% of human conspectuses are genetically abnormal. Occur between day 3 and 21 of extra-uterine life. Assumes dominant role in progesterone production from the cl in the ewe (50 days) and the mare (70 days) The sow (duration) and cow (6-8 months) depend on the cl. Placentome site of nutrient and waste diffusion. Cotyledon: placentome comprised of cotyledon (fetal) Process of expelling fetus and placenta from the uterus.
