Protein requirements of dorper sheep x small tail han sheep Fl lambs

With the development of modern sheep production, in order to effectively improve the production efficiency of sheep, according to the local natural resources and environment to implement the intensive breeding of meat sheep has become the development direction of China's sheep industry. Feed is the basis of the aquaculture industry, accounting for >70% of the cost of sheep production, at the same time, it related to the growth and development, production and reproductive performance of sheep, nutrition and feed problem is an important factor has long been plagued in development of the sheep. In this study, all the male lambs were developed normally and healthy for 3 months (Dorper Sheep x Small Tail Han Sheep F1) with an average body weight of 16.2 +/- 2.1 kg, they were randomly divided into three treatment groups (ad libitum feeding, 65% restricted feeding, 35% restricted feeding) all experimental sheep were fed with MLR and free access to water, single caged in metabolic cages, mainly use the digestion and metabolism trial and slaughter method to infer the protein requirement of 20-35 kg sheep lambs (Dorper Sheep x Small Tail Han Sheep F1). Through the digestion and metabolism trial and slaughter method to speculate the prediction equations of nutritional requirements about Dry Matter Intake (DMI) and Crude Protein Intake (CPI) for stall-feeding fattening of 20-35 kg sheep lambs. Total body N content and retention were determined. Growth pattern of the wool has a high influence on protein requirements of lambs. Dorper Sheep x Small Tail Han Sheep F1 growing lambs used in the study showed protein requirements for growth lower than those reported by the most nutritional systems.