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首页> 外文期刊>Tropical Animal Health and Production >Effect of carbohydrate sources and cotton seed meal in the concentrate: II. Feed intake, nutrient digestibility, rumen fermentation and microbial protein synthesis in beef cattle
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Effect of carbohydrate sources and cotton seed meal in the concentrate: II. Feed intake, nutrient digestibility, rumen fermentation and microbial protein synthesis in beef cattle

机译：精矿中碳水化合物源和棉籽粉的影响：II。肉牛的采食量，养分消化率，瘤胃发酵和微生物蛋白合成

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摘要

Four, rumen fistulated crossbred (Brahman × native) beef cattle steers were randomly assigned to receive four dietary treatments according to a 2 × 2 factorial arrangement in a 4 × 4 Latin square design. Factor A was carbohydrate source; cassava chip (CC) or CC + rice bran at a ratio 3:1 (CR3:1) and Factor B was cotton seed meal level (CM); and 109 g CP/kg (LCM) and 328 g CP/kg (HCM) at similar overall CP levels (490 g CP/kg). The animals were fed 5 g concentrate/kg BW, and urea-treated rice straw (UTS) (50 g urea/kg DM) was fed ad libitum. Carbohydrate source did not affect feed intake, nutrient digestibility, blood urea nitrogen, rumen fermentation, or microbial protein synthesis; however, animals fed with CC had a higher population of total viable bacteria than the CR3:1 treatment (P < 0.05). Animals that received HCM had a lower total feed intake while ruminal pH was higher than the LCM fed treatment (P < 0.05). The population of total viable and cellulolytic bacteria in animals that received HCM were lower than the LCM fed treatment (P < 0.05). Moreover, use of HCM in beef cattle diets resulted in lower microbial protein synthesis when compared with the LCM fed treatment (P < 0.05) although efficiency of microbial protein synthesis was nonsignificantly different among treatments. Therefore, cassava chip combined with rice bran can be used in a concentrate diet for beef cattle. It is also noted that a high level of cotton seed meal in the concentrate may impact rumen fermentation and animal performance.
机译：根据4×4拉丁方设计，按照2×2析因排列方式，随机分配4只瘤胃杂（布拉曼×本地）肉牛ste牛接受4种饮食处理。因子A是碳水化合物的来源；木薯片（CC）或CC +米糠的比例为3：1（CR3：1），因子B为棉籽粉水平（CM）；和109 g CP / kg（LCM）和328 g CP / kg（HCM），总体CP水平相似（490 g CP / kg）。给动物饲喂5 g浓缩物/ kg BW，并随意饲喂尿素处理的稻草（UTS）（50 g尿素/ kg DM）。碳水化合物来源不影响采食量，营养物质消化率，血尿素氮，瘤胃发酵或微生物蛋白合成；然而，饲喂CC的动物比CR3：1处理的总活菌总数更高（P <0.05）。接受HCM的动物的总饲料摄入量较低，而瘤胃pH值高于LCM喂养的治疗组（P <0.05）。接受HCM的动物体内的总存活细菌和纤维素分解细菌的数量低于LCM喂养的动物（P <0.05）。此外，与LCM饲喂处理相比，在肉牛日粮中使用HCM导致微生物蛋白质合成降低（P <0.05），尽管各处理之间微生物蛋白质合成的效率无显着差异。因此，木薯片和米糠可以用于肉牛的浓缩饲料中。还应注意，浓缩物中棉籽粉含量高可能会影响瘤胃发酵和动物生产性能。

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