ẢNH HƯỞNG của tỷ lệ PROTEIN THỰC NITƠ PHI PROTEIN TRONG KHẨU PHẦN đến TĂNG TRỌNG và HIỆU QUẢ KINH tế vỗ béo bò LAI BRAHMAN tại đắk lắk

Vũ chí cương ảnh hưởng tỷ lệ Protein thực / ni tơ phiprotein NH HNG CA T L PROTEIN THC/NIT PHI PROTEIN TRONG KHU PHN N TNG TRNG V HIU QU KINH T V BẫO Bề LAI BRAHMAN TI K LK V Chớ Cng1*, Phm Kim Cng1, Nguyn Thnh Trung1 v Phm Th Hu2 Vin Chn nuụi - Thy Phng - T Liờm - H Ni Trng i hc Tõy Nguyờn * Tỏc gi liờn h : TS V Chớ Cng Tel: (04) 8.386.127 / 0912.121.506; Fax: (04) 8.389.775; Email: vccuong@netnam.com ABSTRACT Effects of varying proportions of different protein sources (true protein and non protein) in the diet on performance of feedlot crossbred Brahman steers in ak Lak Sixteen crossbred Brahman eighteen-month steers (1971kg), kept on shed, were used in the experiments of 84 days In the experiment, the steers were randomly assigned in four groups of four steers each to verify the influence of replacement of different percentages of cotton seed by fish meal in the mix diets containing urea treated rice straw, cassava roof meal, cotton seed, maize, fish meal, urea and molasess on the weight gain and economic efficiency Four strategies were developed to feed either control diet (no fish meal) or diet containing 2.8 or 5.6 or 8.3% fish meal (equal to 10, 20 and 30% crude protein of the diet) kg of elephant grass was fed additionally at the afternoon Average daily gain of cattle was range between 0,732 and 0,845 kg per head pear day Cattle fed diet containing 2.8% fish meal gain more (P ... ngụ, r mt, ht bụng, bt cỏ, urờ Cỏch cho gia sỳc n Vũ chí cương ảnh hưởng tỷ lệ Protein thực / ni tơ phiprotein Cỏc thc n ny c phi trn thnh hn hp dựng cho n c trỡnh by Bng Riờng c voi b sung... level of protein on milk yield and reproductive performance of high-producing primiparous and multiparous dairy cows Anim Prod 48: pp 319 Vũ chí cương ảnh hưởng tỷ lệ Protein thực / ni tơ phiprotein... k c cht to ngon ming c b xung (Nicholson v cs, 1992) Ngoi ra, Vũ chí cương ảnh hưởng tỷ lệ Protein thực / ni tơ phiprotein khu phn 20 v 30% bt cỏ cú th cha quỏ nhiu mui KP, iu ny dn n thay i