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首页> 美国卫生研究院文献>Asian-Australasian Journal of Animal Sciences >Effects of Supplementing Brown Seaweed By-products in the Diet of Holstein Cows during Transition on Ruminal Fermentation Growth Performance and Endocrine Responses
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Effects of Supplementing Brown Seaweed By-products in the Diet of Holstein Cows during Transition on Ruminal Fermentation Growth Performance and Endocrine Responses

机译：过渡期荷斯坦奶牛日粮中添加褐藻副产物对瘤胃发酵生长性能和内分泌反应的影响

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This study was conducted to examine the effects of supplementing brown seaweed by-products (BSB) in the diet of ruminants on ruminal fermentation characteristics, growth performance, endocrine response, and milk production in Holstein cows. In Experiment 1, the effects of different levels (0%, 2%, and 4% of basal diet as Control, 2% BSB, 4% BSB, respectively) of BSB were evaluated at 3, 6, 9, 12, and 24 h in vitro batch culture rumen fermentation. The pH tended to be higher for the higher level of BSB supplementation, with the pH at 12 h being significantly higher (p<0.05) than that of the control. The concentration of ammonia nitrogen was lower at 3, 9, 12, and 24 h incubation (p<0.05) compared with the control, and tended to be low at other incubation times. Volatile fatty acid concentration appeared to be minimally changed while lower values were observed with 4% BSB treatment at 24 h (p<0.05). In Experiment 2, effects of levels (0%, 2%, and 4%) of BSB on growth performance, endocrine responses and milk production were studied with Holstein dairy cows during transition. Dry matter intake, daily gain and feed efficiency were not affected by BSB supplementation. The concentration of plasma estrogen for the control, 2% BSB and 4% BSB after three months of pregnancy were 55.7, 94.1, and 72.3 pg/mL, respectively (p = 0.08). Although the differences of progesterone levels between BSB treatments and the control were minimal, the concentration in 4% BSB treatment increased to 157.7% compared with the initial level of the study. Triiodothyronine and thyroxine levels were also higher after both three months and eight months of pregnancy than the initial level at the beginning of the study. In addition, BSB treatments during one month after delivery did not affect daily milk yield and composition. In conclusion, the present results indicate that supplementation of BSB did not compromise ruminal fermentation, and animal performance at lower levels and hence may have potential to be used as a safe feed ingredient in dairy cows.
机译：这项研究旨在检查反刍动物日粮中添加褐藻副产物（BSB）对荷斯坦奶牛瘤胃发酵特性，生长性能，内分泌反应和产奶量的影响。在实验1中，分别在3、6、9、12和24评估了BSB的不同水平（分别作为对照的基础饮食的0％，2％和4％，2％BSB，4％BSB）的效果。 h体外分批培养瘤胃发酵。对于较高水平的BSB补充，pH趋于更高，在12 h时，pH显着高于对照（p <0.05）。与对照组相比，在培养3、9、12和24 h时氨氮的浓度较低（p <0.05），在其他培养时间往往较低。挥发性脂肪酸浓度似乎变化不大，而在24 h用4％BSB处理时观察到较低的值（p <0.05）。在实验2中，研究了荷斯坦奶牛在过渡期间BSB水平（0％，2％和4％）对生长性能，内分泌反应和产奶量的影响。补充BSB不会影响干物质的摄入，日增重和饲料效率。怀孕三个月后，对照组，2％BSB和4％BSB的血浆雌激素浓度分别为55.7、94.1和72.3 pg / mL（p = 0.08）。尽管BSB治疗与对照组之间的孕酮水平差异很小，但与研究的初始水平相比，4％BSB治疗中的孕激素浓度增加至157.7％。在怀孕三个月和八个月后，三碘甲状腺素和甲状腺素水平也高于研究开始时的初始水平。此外，分娩后一个月内的BSB处理不会影响每日的牛奶产量和组成。总之，目前的结果表明，补充BSB不会损害瘤胃发酵，而且动物水平较低时的性能也因此可能具有作为奶牛安全饲料成分的潜力。

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