تاثير سطوح متفاوت انرژي و پروتيين قابل متابوليسم بر كميت و كيفيت الياف كشمير بزغاله هاي نر راييني

Effects of dietʹs metabolisable energy and protein level on cashmere fiber characteristics

The cashmere characteristics were assessed in Raini kids offered various levels of metabolisable energy (ME) and metabolisable protein (MP). A total of seventy five male kids (initial live weight of 17.5 ± 2.1 Kg) were used according to a 5 x 5 factorial design defined by five levels of ME (1 1.1(1, 10.37, 9.65, 8.92 and 8.20 N1,1/Kg DM) and five levels of MP (9.90, 9.07, 8.28, 7.58 and 6.65, DM basis). All the diets were formulated according to AFRC (1998). To determine the quantity and quality of the fiber, the animals were sheared at the beginning and at the end of the trial. The energy level 11.1 MJ/Kg DM had significantly (p <0.01) increased the cashmere daily growth in comparison with other energy levels. The average cashmere growth for different energy levels was 5.27, 4.30, 4.09, 4.01 and 4.10 g/day respectively. The dietary MP level of 6.65% has decreased significantly (p <0.05) the daily growth rate of cashmere in comparison to other levels. Neither the energy nor the protein levels have affected the length, diameter and percent of cashmere yield of the kids.