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Manipulation of estrous cycle or induction of estrus to bring a large percentage of a group females into estrus at a short predetermined time. Estrus synchronization minimizes problems associated with estrus detection, such as labor costs and estrus detection errors. Estrus synchronization allows the more efficient use of artificial insemination with the use of elite sires having superior genetic makeup and embryo transfer procedures.

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Few countries in the world have no sheep. They are found in tropical countries and in the arctic, in hot climates and in the cold, on the desert and in humid areas. There are over 800 breeds of sheep in the world, in a variety of sizes, shapes, types and colours. Sheep were domesticated long before the dawn of recorded history. Wool fibres have been found in remains of primitive villages of Switzerland that date back an estimated 20000 years. Egyptian sculpture dating 4000-5000 B.C. portrays the importance of this species to people. Much mention is made in the Bible of flocks, shepherds, sacrificial lambs, and garments made of wool. The Roman empire pried sheep, anointed them with special oils, and combed their fleece to produce fine quality fibres that were woven into fabric for the togas of the elite. Perhaps the first ruminants domesticated by man along with goats, sheep are a very valuable and important asset to mankind. Sheep is a important livestock species . They contribute greatly to the agrarian economy, especially in the arid/semi-arid and mountainous areas where crop and /or dairy farming are not economical. They play an important role in the livelihood of a large percentage of small and marginal farmers and landless labourers engaged in sheep rearing. A number of rural-based industries use wool and sheep skins as raw material. Sheep manure is an important source of soil fertility, especially in southern states.

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Minerals Deficiencies in Poultry Causes ,Effect & Treatment.A deficiency of either calcium or phosphorus in the diet of young growing birds results in abnormal bone development even when the diet contains adequate vitamin D3 . A deficiency of either calcium or phosphorus results in lack of normal skeletal calcification. Rickets is seen mainly in growing birds, while calcium deficiency in laying hens results in reduced shell quality and osteoporosis. This depletion of bone structure causes a disorder that is commonly referred to as “cage layer fatigue.” When calcium is mobilized from bone to overcome a dietary deficiency, the cortical bone erodes and is unable to support the weight of the hen. A deficiency of manganese in the diet of immature chickens and turkeys is one of the causes of perosis and of thin-shelled eggs and poor hatchability in mature birds (also see Nutrition and Management: Poultry: Calcium and Phosphorus Imbalances). It can also cause chondrodystrophy. The most dramatic effect of manganese deficiency syndrome is perosis, characterized by enlargement and malformation of the tibiometatarsal joint, twisting and bending of the distal end of the tibia and the proximal end of the tarsometatarsus, thickening and shortening of the leg bones, and slippage of the gastrocnemius tendon from its chondyles. Elevated intakes of calcium and/or phosphorus will aggravate the condition due to reduced absorption of magnesium by precipitated calcium phosphate in the intestinal tract. In laying hens, reduced egg production, markedly reduced hatchability, and eggshell thinning are often noted. Deficiencies of both iron and copper can lead to anemia. Iron deficiency causes a severe anemia with a reduction in PCV. In color-feathered strains, there is also loss of pigmentation in the feathers. The birds' requirements for RBC synthesis take precedence over metabolism of feather pigments, although if a fortified diet is introduced, all subsequent feather growth is normal. Iron may be needed not only for the red feather pigments, which are known to contain iron, but also to function in an enzyme system involved in the pigmentation process.

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