Abstract: In order to give full play to the Boer goat heterosis，fattening period through research crossbred Boer goats of the wave energy and protein nutritional requirements parameters, screening of a better economic efficiency and the energy mix of protein feed supplements, with a view to keeping the scientific theoretical basis and provide production guidance. Sixteen fattening crossbred male Boer goats F1weaned at the age of 3 month were used to Study. A 4×4 Latin square experiment design was conducted to study the energy and protein requirements of stallfeeding crossbred Boer goats fed the four different diets based on recommendation of nutrients requirements of NRC(1981). The results show that: The concentration of BUN in plazma was significant difference (P<0.05) between diet 3 and diet 2,4; ALB concentrations in serum was significant difference (P<0.05) between diet 1 and diet 2,4; TG concentrations in serum was significant difference (P<0.05) between diet 1 and diet 4; The concentration of InS in plazma was significant difference(P<0.05) between diet 1 and diet 2,4,and there was significant difference(P<0.05) between diet 2 and diet 3; TCho concentrations in serum was significant difference(P<0.05) between diet 1 and diet 3,4；there was no significant difference (P<0.05) in other blood indexs. 

Key words: crossbred Boer goats; energy; protein; blood