Factors effect on estrous cycle: i)seasonal factors ii)feedstuff:nutritional factor iii)temperature iv)tempt of male to female animal. 2.copulation and Fertilization 2.1 Fertilization:Fertilization occurs when a few sperm are transported to the ampullae ofthe fallopian tubes and enter the ovum. 2.2 Location offertilization:ampullary portion ofthe tube 2.3 changes ofsperm before fertilization (1)sperm capacitation:The process that enables sperm to bind to the ovum. 2.4 process offertilization i)Sperm andovum encounter ii)sperm enter ovum:drill through corona radiate pellucid zone enter ovum iii)The formation ofmalepronucleus and female pronucleus iv)Gamete formated Seaction3 Pregnancy Pregnancy:The process in which the fertilized ovum eventually develops into a full term fetus. 1.Establishment ofpregnancy (1)egg cleavage (2)Implantation:The blastocyst reaches the uterus and attaches to the uterine wall, it involves interactions between the endometrium and embryo.Factors effect on estrous cycle: i) seasonal factors ii) feedstuff: nutritional factor iii) temperature iv) tempt of male to female animal. 2. copulation and Fertilization 2.1 Fertilization: Fertilization occurs when a few sperm are transported to the ampullae of the fallopian tubes and enter the ovum. 2.2 Location of fertilization: ampullary portion of the tube 2.3 changes of sperm before fertilization (1)sperm capacitation:The process that enables sperm to bind to the ovum. 2.4 process of fertilization i) Sperm and ovum encounter ii) sperm enter ovum: drill through corona radiate pellucid zone enter ovum iii) The formation of malepronucleus and female pronucleus iv) Gamete formated Seaction3 Pregnancy Pregnancy: The process in which the fertilized ovum eventually develops into a full term fetus. 1. Establishment of pregnancy (1) egg cleavage (2) Implantation: The blastocyst reaches the uterus and attaches to the uterine wall, it involves interactions between the endometrium and embryo