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The minerals are essential for all of animals and influence the animal productivity mainly in the growth fase. The deficeince or the excess of mineral can lead to metabolic disorders resulting to low production and low reproductive performace. Therefore the objectivo of this study is to evalue the effect od feed restrition on calcium (Ca), phosphorus (P) and magnesium (Mg) metabolism of male and female kids goats. Will be used 54 Saanen kids goats (18 intact males, 18 castrate and 18 female) with initial body weight of 15 kg subjected to feed restriction ( ad libitum, 25% and 50% of feed restriction). Blood samples will be collected each 15 days until the group ad libitum arrive to 30 kg of body weight. Analysis of Ca, P, Mg and Alkaline phosphoatase will be performed with especific comercial kit.The data will be analyse as a completed randomized blocks, with repeated measures over time. The statistical analises will be performed usin the MIXED procedure of SAS statistical progam. Will be choosed the covariate matrix that bette fit the data according to Bayesian information criterion ( BIC ). (AU)

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