| dc.description.abstract | The aim of this research was to evaluate dairy cattle performances according to nutrient requirement especially third and fourth lactation period. The measured parameters were body weight, milk production, feed consumption and nutrient balance. The cows were divided into two groups according to the body weight. Those groups were groups of heavier body weight and groups of lighter body weight in each lactation period. According to lactation curve, the peak of milk production was reached at second rnontl~ of lactation period. The heavier cows groups included in third lactation and fourth lactation period were insufficient of energy (Total Digestible Nutrient). In addition, the heavier cows in fourth lactation period suffered crude protein insufficiency. Otherwise, the lighter cows groups included in both lactation period were abundantly required in dry matter, Total Digestible Nutrient, crude protein, calsium, and phosphorus. Keywords : lactation period, milk production, body weight, nutrient balance | en |
