The average monthly weight gain rate of male deer at the age of 1 year is 4.2%, which means that at this time it is still in the stage of growth and development. The tissues and organs have not yet fully matured. The initial growth of velvet antler has just begun. The nutrients needed during this period are not only Need to meet the needs of its growth and development, but also to meet its velvet needs, therefore, this period of higher nutritional requirements for the diet. The appropriate levels of energy (total energy) and protein (crude protein) in this diet were 17.35 MJ/kg and 22.4%, respectively; metabolic energy per kg of metabolic body weight per day. Metabolizable protein. The requirements for calcium and phosphorus were 991 kJ, 8.05 g, 0.78 g, and 0.45 g, respectively. The average daily energy requirement (total energy) and crude protein requirement for each deer were 37 MJ and 478 g, respectively.
The average monthly weight gain rate of two-year-old plum blossoms is 1.9%, and their individual growth and development are almost mature. During this period, male deer began to breed headless oysters, and the antler capacity (ie, the amount of antler) was low, but the feed intake began to increase, and the ability to feed roughage was increased. Therefore, the nutritional requirements for diets are relatively low at this time, and the appropriate levels of total energy and crude protein in feed during this period are 16.18 MJ/kg and 18.5% respectively. The daily requirement for metabolic energy, digestible crude protein, calcium, and phosphorus per kilogram of body weight was 819 kJ, 6.01 g, 0.75 g, and 0.41 g, respectively.
The average annual weight gain rate of the three-year-old deer male deer is 0.4%, which basically reaches the maturity of the body. The amount of antler produced began to increase. The appropriate levels of total energy and crude protein in the diet were 16.55 MJ/kg and 19.0%, respectively; the appropriate levels of calcium and phosphorus in concentrate supplements were 1.23% and 0.64%, respectively. The daily requirement for metabolic energy, metabolisable crude protein, calcium, and phosphorus per kilogram of metabolic body weight was 890 kJ, 5.63 g, 0.85 g, and 0.44 g, respectively.
The appropriate levels of total energy and crude protein in the diet of sika deer aged 4 years were 19.39 MJ/kg and 15.9%, respectively; the need for metabolic energy, metabolisable crude protein, calcium, and phosphorus per kilogram of metabolic body weight per day. The amounts were 941 kJ, 5.41 g, 0.85 g, and 0.43 g, respectively.
The appropriate levels of total energy and crude protein in the diet of sika deer at the age of 5 years were 16.72 MJ/kg and 16.6%, respectively; the metabolic energy needed per kilogram of metabolic body weight per day required to metabolize crude protein, calcium, and phosphorus. The amounts were 782 kJ, 5.38 g, 0.79 g and 0.43 g, respectively.
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