Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.
J Anim Physiol Anim Nutr (Berl). 2010 Dec;94(6):e259-65. doi: 10.1111/j.1439-0396.2009.00966.x.
The objective of this study was to investigate the effect of feeding different levels of ruminally protected methionine and choline on the incidence of physiological and metabolic disorders, production, and some of the reproductive indices of Holstein dairy cows. Forty Holstein dairy cows in their first and second lactation were used from 4-week pre-partum through 20-week post-partum and randomly assigned to receive one of the following treatments: 18 g/day of rumen-protected methionine (RPM), 60 g/day of rumen-protected choline (RPC), 18 g/day of RPM + 60 g/day of RPC, and neither supplement (control). The treatments significantly affected services per conception and open days of lactating dairy cows (p < 0.05), but did not affect significantly on days to first oestrus and number of pregnant cows. RPM + RPC-fed cows had the lowest open days, days to first oestrus and services per conception compared with other groups. The effect of treatments was significant on the incidence of metabolic and physiological problems except for foot/leg problems. Cows fed RPM+RPC had the lowest health problems compared with other groups (p < 0.05). Results indicate that the supplementation of RPM and RPC can improve reproductive performance and health status of dairy cows.
本研究旨在探讨不同水平的瘤胃保护性蛋氨酸和胆碱对荷斯坦奶牛生理和代谢紊乱的发生率、生产性能以及部分繁殖指标的影响。在产前 4 周至产后 20 周期间，选择了 40 头处于第一和第二泌乳期的荷斯坦奶牛，并将其随机分配接受以下处理之一：18 克/天的瘤胃保护性蛋氨酸（RPM）、60 克/天的瘤胃保护性胆碱（RPC）、18 克/天的 RPM+60 克/天的 RPC 以及不补充（对照）。处理显著影响了受孕服务次数和泌乳奶牛的开放天数（p<0.05），但对首次发情天数和妊娠奶牛数量没有显著影响。与其他组相比，RPM+RPC 喂养的奶牛开放天数、首次发情天数和受孕服务次数最低。除了脚部/腿部问题外，处理的效果对代谢和生理问题的发生率有显著影响。与其他组相比，RPM+RPC 喂养的奶牛健康问题最少（p<0.05）。结果表明，补充 RPM 和 RPC 可以提高奶牛的繁殖性能和健康状况。
