摘要
Nine ruminally fistulated Nellore steers were located in nine paddocks of palisade grass (Brachiaria brizantha cv. Marandu) pasture under daily supplementation (seven times per week), from Monday to Friday (five times per week) or Monday, Wednesday and Friday (three times per week). Ruminal fluid was sampled on two consecutive days. On the first day, all the animals that were supplemented (D1) and other subsequent day in which only for the animals under daily supplementation received the supplement (D2). The supplementation frequency did not affect the forage DMI, total DMI and DMD. The DMI and DMD were influenced by the experimental period, with reduction from March to May. Ruminal pH was not affected by the supplementation frequency. Supplementation frequency X collection day X collection hour interaction was observed for ruminal NH3-N. No difference in the D1 was observed in NH3-N concentration among the hours after supplementation in the daily supplementation frequency, while in the D2 there was a peak of NH3-N production 3 hours after supplementation. Among the animals under five times per week supplementation, the difference between D1 and D2 was due to the time 12 of the D2 (7 mg/dL). In the three times per week, the NH3-N concentration in D1 peaked at 3-9 hours after supplementation. The supplementation frequency only affected total SCFA concentration in the D1 and butyric acid concentration in the D2. The month of the year did not affect the ruminal pH and NH3-N concentration. However, the SCFA concentration was significantly reduced from March to May.
摘要译文
九瘤胃瘘管内洛尔公牛分别位于9牧场栅栏草（臂形brizantha品种。Marandu）下，每天补充牧场（每周7次），从星期一到星期五（每周5次）或周一，周三和周五（每周三次）。胃液取样连续两天。在第一天，所有进行补充，该动物（D1）和其它随后的一天，其中仅根据每日补充动物接受补充（D2）。该补充的频率并没有影响到牧草DMI，总DMI和DMD。该DMI和DMD是由实验阶段的影响，减少与3-5月。瘤胃pH值并不受补充频率。观察到瘤胃NH 3 -N补充频率X收集日X集合小时的互动。向D1没有差异，观察的NH 3 -N浓度的时间中补充后的每日补充频率，而在D2存在的NH 3 -N生产补充3小时后的峰。间下每周补充5倍的动物，D1和D2之间的差是由于向D2（7毫克/分升）的时间为12。在每周三次，在D1的NH 3 -N浓度达到峰值后补充3-9小时。的补充频率仅受总SCFA浓度在D1和丁酸浓度向D2。在这一年中一个月没影响瘤胃pH值和NH 3 -N浓度。然而，短链脂肪酸浓度显著从三月减少到五月。
MORAIS, Juciléia Aparecida da Silva. Influence of supplementation frequency on intake, digestibility and ruminal fermentation in beef cattle steers grazing palisade grass[J]. Revista Brasileira de Zootecnia, 2009,38(9): 1824-1834