摘要
Zenobi, M. G., Lardner, H. A., Jefferson, P. G. and McKinnon, J. J. 2014. Blended by-product feed pellets for backgrounding cattle. Can. J. Anim. Sci. 94: 533–543. Two trials were conducted to evaluate the performance of cattle fed blended by-product pellets (BP) formulated to be high in starch (HS 45% DM) or fat (HF 8.5% DM) and low (LSP; 27% of CP DM) or high (HSP; 37% of CP DM) in soluble protein. In trial 1, 300 crossbred steers (320±21.6 kg, mean±SD) were assigned to one of 25 pens and fed one of five diets. The control diet consisted of 46.9% forage and 53.1% barley-based concentrate. The four treatments were 48.5% forage and 51.5% BP (DM). Diets were formulated to 1.63 and 1.02 Mcal kg−1 NEm and NEg, respectively (DM). In trial 2, 180 crossbred steers (326±20.3 kg) were assigned to one of 15 pens, each assigned to one of three treatments. The control was 54.3% forage and 45.7% concentrate, while the two HF BP treatments were 56.6% forage and 43.4% BP (DM). All diets were formulated to 1.57 and 0.97 Mcal kg−1 NEm and NEg, respectively (DM). In trial 1, no (P=0.36) effect of treatment was observed on average daily gain (ADG); however, dry matter intake (DMI) was reduced (P<0.01) with the HS BP relative to the control and HF BP. Gain:feed (G:F) was poorest (P<0.01) for the HF BP. In Trial 2, no effect of treatment was observed on ADG (P=0.80) or DMI (P=0.06); however, cattle fed the control diet had the highest (P<0.01) G:F. Relative to the control, the calculated dietary NEg content (Mcal kg−1 DM) was 8.0% lower (P<0.01) for the HF BP in Trial 1 and 6.7% lower (P<0.01) in Trial 2. No effect (P>0.05) of soluble crude protein was observed. The results indicate that BP can be a viable supplemental energy and protein source for growing cattle.
摘要译文
Zenobi，M.G.，Lardner，H.A.，Jefferson，P.G。和McKinnon，J。J. 2014.用于背景牛的混合副产品饲料颗粒。能够。 J. Anim。科学。 94：533-543。进行了两项试验，以评估饲喂混合副产品颗粒（BP）的牛的性能，该颗粒配制成高淀粉（HS 45％DM）或脂肪（HF 8.5％DM）和低（LSP; CP DM的27％或高（HSP;可溶性蛋白质中含有37％的CP DM）。在试验1中，将300只杂交阉牛（320±21.6kg，平均值±SD）分配给25只笔中的一只，并喂食五种饮食中的一种。对照饮食由46.9％的饲料和53.1％的基于大麦的浓缩物组成。四种处理是48.5％的饲料和51.5％的BP（DM）。将饮食配制成分别为1.63和1.02 Mcal kg -1 NEm和NEg（DM）。在试验2中，将180只杂交阉牛（326±20.3kg）分配到15个围栏中的一个，每个围栏分配给三个处理中的一个。对照为54.3％的饲料和45.7％的浓缩物，而两种HF BP处理为56.6％的饲料和43.4％的BP（DM）。将所有饮食配制成分别为1.57和0.97 Mcal kg -1 NEm和NEg（DM）。在试验1中，观察到平均日增重（ADG）没有（P = 0.36）治疗效果;然而，HS BP相对于对照和HF BP，干物质摄入量（DMI）降低（P <0.01）。增益：HF BP的饲料（G：F）最差（P <0.01）。在试验2中，未观察到治疗对ADG（P = 0.80）或DMI（P = 0.06）的影响;然而，饲喂对照饮食的牛最高（P <0.01）G：F。相对于对照，计算的膳食NEg含量（Mcal kg -1 DM）在试验1中的HF BP降低了8.0％（P <0.01），在试验1中降低了6.7％（P <0.01）。试验2.未观察到可溶性粗蛋白的影响（P> 0.05）。结果表明，BP可以成为生长牛的可行的补充能量和蛋白质来源。
M. G. Zenobi;[1] H. A. Lardner;[2] P. G. Jefferson;[2] J. J. McKinnon[1]. Blended by-product feed pellets for backgrounding cattle[J]. Canadian Journal of Animal Science, 2014,94(3): 533-543