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.
摘要译文
四，瘤胃瘘管的杂交（婆罗门×原生）肉牛肉牛被随机分配按照2接收4饮食治疗×和109克CP /公斤（LCM）和328克CP /公斤（HCM）在相似的整体水平CP（490克CP /公斤）。将动物饲喂5克浓缩物/ kg体重，和尿素处理的稻草（UTS）（50克脲/ kg干物质）中的自由进食。碳水化合物源没有影响饲料的摄入量，营养物质消化率，血液尿素氮，瘤胃发酵，或微生物的蛋白质合成;然而，动物喂食CC有较高的人口总量活菌比CR3：1治疗（P收到HCM有一个更低的总采食量，而瘤胃pH值比LCM喂治疗高等动物（P总可行，纤维分解菌的动物接受HCM人口分别比LCM喂治疗降低（P在肉牛日粮中使用HCM的导致较低的微生物蛋白质合成时，与LCM饲喂处理相比（P05）虽然微生物蛋白质的合成效率处理间不显着的不同。因此，木薯芯片结合米糠可以以浓缩物的饮食对肉牛中使用。人们还注意到，在该浓缩物高水平的棉籽粕可能影响瘤胃发酵和动物的表现。
Metha Wanapat [1] Suban Foiklang [1] Peter Rowlinson [2] Ruangyote Pilajun [1]. 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[J]. Tropical Animal Health and Production, 2012,44(1): 35-42