摘要
The objectives in this trial were to determine the effects of adding increased levels of narasin on nutrient intake and digestibility in wethers fed low quality forage. Five White Dorper × Santa Inês wethers (BW 68.7 ± 2.1 kg), cannulated in the rumen, were used in a 5 × 5 Latin square design. Animal were fed daily and diet was composed of coastcross bermudagrass hay (91.0% DM; 67.2% NDF; 32.1% ADF; 6.8% CP; 3.2% EE; 17.3% NFC; 5.5% ash). Narasin was offered twice a day and levels were 0 (control, N0), 8 (N8), 16 (N16), 24 (N24), or 32 (N32) mg/kg DM, corresponding to 0, 80, 160, 240, and 320 mg of Zimprova 100®. The delivery vehicle of narasin was 20 g of ground corn containing the set dosage of narasin in 1 kg of DM. Every experimental period lasted 20 d. The first 15 d were used to adapt the wethers with the experimental diets. Daily feed intake and fecal output were determined on Days 16, 17, 18, and 19 of each period. For total collection of feces, harnesses with collection bags were used to avoid contamination of feces by urine. Data were analyzed using the MIXED procedure (SAS Inst. Inc.) and the LSMEANS option was used to generate individual means. The effect of narasin levels were evaluated using linear and quadratic orthogonal contrasts. The effects were considered significant when P < 0.10. Increasing levels of narasin did not affect dry matter (1.1 ± 0.2 kg; P = 0.70), organic matter (1.0 ± 0.2 kg; P = 0.69), NDF (0.7 ± 0.1 kg; P = 0.69), and ADF (0.3 ± 0.01 kg; P = 0.68) intakes. Experimental diets did not affect DM (50.5 ± 2.6%; P = 0.57) and OM (50.9 ± 2.6%; P = 0.63) digestibilities. However, narasin increased linearly NDF digestibility (N0: 50.4%; N8: 53.7%; N16: 51.8%; N24: 55.0%; N32: 55.2%; P = 0.06). ADF digestibility tended to differ with increased levels of narasin (N0: 49.1; N8: 51.1; N16: 49.2; N24: 53.4; N32: 53.0%; P = 0.15). Levels of narasin improve NDF digestibility in wethers fed a low quality forage diet without affecting nutrient intake.
摘要译文
这项试验的目的是确定增加Narasin水平对喂养低质量牧草的营养物质摄入量和消化率的影响。五个白色Dorper×圣诞老人Inês母亲（体重68.7±2.1公斤），瘤胃插管，用于5×5拉丁方设计。动物每天喂食，饮食由海岸交叉百慕大干草组成（91.0％DM; 67.2％NDF; 32.1％ADF; 6.8％CP; 3.2％EE; 17.3％NFC; 5.5％灰分）。Narasin每天提供两次，水平为0（对照，N0），8（N8），16（N16），24（N24）或32（N32）mg / kg DM，对应于0,80,160,240和320毫克Zimprova 100 / sup。Narasin的投递载体是在1kg DM中含有设定剂量Narasin的20g磨碎的玉米。每个试验期持续20 d。前15天用于使湿润者适应实验饮食。在每个周期的第16,17,18和19天确定每日采食量和粪便量。对于粪便的总收集，收集袋的挽具用于避免尿液污染粪便。数据使用MIXED程序（SAS Inst。Inc.并且LSMEANS选项用于生成单个手段。使用线性和二次正交对比来评估Narasin水平的影响。当P 0.10时，效果被认为是显着的。 （0.01±0.2 kg; P \x3d 0.70），有机物（1.0±0.2 kg; P \x3d 0.69），NDF（0.7±0.1 kg;P \x3d 0.69），ADF（0.3±0.01 kg; P \x3d 0.68）摄入量。实验日粮不影响DM（50.5±2.6％; P \x3d 0.57）和OM（50.9±2.6％; P \x3d 0.63）的消化率。然而，Narasin线性增加NDF消化率（N0：50.4％; N8：53.7％; N16：51.8％; N24：55.0％; N32：55.2％; P \x3d 0.06）。 ADF消化率倾向于随着Narasin水平的增加而不同（N0：49.1;N8：51.1; N16：49.2; N24：53.4; N32：53.0％; P \x3d 0.15）。在不影响营养摄入的情况下，Narasin水平可提高饲喂低品质饲料日粮的日粮中NDF的消化率。
D. M. Polizel;M. F. Westphalen;A. A. Miszura;M. H. Santos;R. G. Silva;A. V. Bertoloni;G. B. Oliveira;M. V. C. Ferraz Junior;M. V. Biehl;I. Susin;A. V. Pires. 1684 Effect of Narasin on nutrient intake and digestibility in wethers fed high-forage diets[J]. Journal of Animal Science, 2016,94(Sup5): 821