摘要
The rumen pH, ammonia (NH3) and volatile fatty acid (VFA) concentrations and patterns, protozoal population, bacterial urease activity of rumen liquor and tissues along the gastrointestinal tract, and the growth performance were studied in 4 male and 4 female 14-month-old Draughtmaster cattle fed palm kernel cake-based diet ad libitum for 185 days. Palm kernel cake (solvent and expeller types) made up 89% of the diet. The animals showed a satisfactory response to the diet, indicating a high nutritive value of the feed material. The concentration of NH3 was relatively high in all animals, with mean values of 35.5 ± 10.97 and 39.19 ± 11.50 mmol 1−1 for males and females, respectively. The mean VFA concentration for all animals was 78.8 ± 7.9 mmol 1−1. The molar percentages of acetate, propionate, isobutyrate, butyrate, isovalerate and valerate were 52.3 ± 1.6, 26.2 ± 1.9, 5.7 ± 1.0, 10.3 ± 1.8, 4.2 ± 1.0 and 1.4 ± 0.7, respectively. Protozoa were not detected in the rumen liquor of all animals. Urease activity units per ml of liquor were 9.16 ± 1.78 for males and 9.14 ± 2.20 for females, while the mean of 8 tissue sites (each 6.25 cm2) of the reticulo-rumen was slightly higher for males (6.18 ± 2.45) than for females (4.50 ± 2.73). Urease activity was significantly affected (P
摘要译文
研究了瘤胃pH，氨（NH 3）和挥发性脂肪酸（VFA）浓度和模式，原生动物种群，瘤胃液和胃肠道组织的细菌脲酶活性以及生长性能，研究了4名男性和4名女性14-一个月大的Draughtmaster牛饲喂基于棕榈仁蛋糕的饮食，随意饮食185天。棕榈仁蛋糕（溶剂和榨汁机类型）占饮食的89％。动物对饮食表现出令人满意的反应，表明饲料原料的营养价值很高。所有动物的NH 3浓度相对较高，男性和女性的平均值分别为35.5±10.97和39.19±11.50 mmol 1 -1 。所有动物的平均VFA浓度为78.8±7.9mmol 1 -1 。乙酸盐，丙酸盐，异丁酸盐，丁酸盐，异戊酸盐和戊酸盐的摩尔百分比分别为52.3±1.6,26.2±1.9,5.7±1.0,10.3±1.8,4.2±1.0和1.4±0.7。在所有动物的瘤胃液中未检测到原生动物。每毫升白酒的脲酶活性单位男性为9.16±1.78，女性为9.14±2.20，而网状瘤胃的8个组织部位（每个6.25 cm 2 ）的平均值略高于男性（6.18±2.45）比女性（4.50±2.73）。脲酶活性受到显着影响（P.
N.Abdullah;R.I.Hutagalung[*];. Rumen fermentation, urease activity and performance of cattle given palm kernel cake-based diet[J]. Animal Feed Science and Technology, 1988,20(1): 79-86