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Veterinary Castration
Castration is any action, surgical, chemical, or otherwise, by which an individual loses use of the testicles: the male gonad. Surgical castration is bilateral orchiectomy (excision of both testicles), while chemical castration uses pharmaceutical drugs to deactivate the testes. Castration causes sterilization (preventing the castrated person or animal from reproducing); it also greatly reduces the production of hormones, such as testosterone and estrogen. Surgical castration in animals is often called neutering. The term ''castration'' is sometimes also used to refer to the removal of the ovaries in the female, otherwise known as an oophorectomy, or the removal of internal testes, otherwise known as gonadectomy. The equivalent of castration for female animals is spaying. Estrogen levels drop following oophorectomy, and long-term effects of the reduction of sex hormones are significant throughout the body. Castration of animals is intended to favor a desired development of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estrogen
Estrogen or oestrogen is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal activity: estrone (E1), estradiol (E2), and estriol (E3). Estradiol, an estrane, is the most potent and prevalent. Another estrogen called estetrol (E4) is produced only during pregnancy. Estrogens are synthesized in all vertebrates and some insects. Their presence in both vertebrates and insects suggests that estrogenic sex hormones have an ancient evolutionary history. Quantitatively, estrogens circulate at lower levels than androgens in both men and women. While estrogen levels are significantly lower in males than in females, estrogens nevertheless have important physiological roles in males. Like all steroid hormones, estrogens readily diffuse across the cell membrane. Once inside the cell, they bind to and activate estrogen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of China
The earliest known written records of the history of China date from as early as 1250 BC, from the Shang dynasty (c. 1600–1046 BC), during the reign of king Wu Ding. Ancient historical texts such as the ''Book of Documents'' (early chapters, 11th century BC), the ''Bamboo Annals'' (c. 296 BC) and the ''Records of the Grand Historian'' (c. 91 BC) describe a Xia dynasty before the Shang, but no writing is known from the period, and Oracle Bone script, Shang writings do not indicate the existence of the Xia. The Shang ruled in the Yellow River valley, which is commonly held to be the cradle of Chinese civilization. However, Neolithic civilizations originated at various cultural centers along both the Yellow River and Yangtze, Yangtze River. These Yellow river civilization, Yellow River and Yangtze civilizations arose millennia before the Shang. With thousands of years of continuous history, China is among the world's oldest civilizations and is regarded as one of the Cradle of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacrifice
Sacrifice is the offering of material possessions or the lives of animals or humans to a deity as an act of propitiation or worship. Evidence of ritual animal sacrifice has been seen at least since ancient Hebrews and Greeks, and possibly existed before that. Evidence of ritual human sacrifice can also be found back to at least pre-Columbian civilizations of Mesoamerica as well as in European civilizations. Varieties of ritual non-human sacrifices are practiced by numerous religions today. Terminology The Latin term ''sacrificium'' (a sacrifice) derived from Latin ''sacrificus'' (performing priestly functions or sacrifices), which combined the concepts ''sacra'' (sacred things) and ''facere'' (to do or perform). The Latin word ''sacrificium'' came to apply to the Christian eucharist in particular, sometimes named a "bloodless sacrifice" to distinguish it from blood sacrifices. In individual non-Christian ethnic religions, terms translated as "sacrifice" include the Indic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holiness Code
The Holiness code is used in biblical criticism to refer to Leviticus chapters 17–26, and sometimes passages in other books of the Pentateuch, especially Numbers and Exodus. It is so called due to its highly repeated use of the word ''holy'' ( '' qəḏōš'' or ''kadash''). ''Kadash'' is usually translated as "holy", but originally meant "set apart", with "special", "clean/pure", "whole" and "perfect" as associated meanings. The term ''Holiness Code'' was first coined as the ''Heiligkeitsgesetz'' (literally "Holiness Law"; the word 'code' therefore means criminal code) by German theologian August Klostermann in 1877. Critical biblical scholars have regarded it as a distinct unit and have noted that the style is noticeably different from the main body of Leviticus. Unlike the remainder of Leviticus, the many laws of the Holiness Code are expressed very closely packed together, and very briefly. According to most versions of the documentary hypothesis, the Holiness Code repr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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