Wang Beibei, Wang Chong, Guan Ruowei, Shi Kai, Wei Zihai, Liu Jianxin, Liu Hongyun
College of Animal Sciences, Zhejiang University, Hangzhou 310058, China.
College of Animal Sciences and Technology, Zhejiang A & F University, Hangzhou 311300, China.
Animals (Basel). 2019 Apr 15;9(4):167. doi: 10.3390/ani9040167.
The objective of this study was to evaluate the effects of rumen-protected betaine supplementation on performance of postpartum dairy cows and immunity of newborn calves. Twenty-four multiparous Holstein dairy cows were randomly divided into the control (CON, = 12) and rumen-protected betaine (BET, = 12) groups after blocking by parity and milk yield during the previous lactation cycle. The cows were fed a basal total mixed ration diet without BET (CON) or with BET at 20 g/d per cow (BET) from four weeks before expected calving to six weeks postpartum. The results showed that betaine supplementation had no effect on dry matter intake and milk yield of the cows. The BET cows tended to increase feed efficiency (energy-corrected milk/dry matter intake) and body weight loss postpartum compared to the CON cows. The plasma β-hydroxybutyrate concentrations of the BET cows were greater at d seven after calving than those of the CON cows. Moreover, compared to the CON calves, the BET calves had greater plasma total protein and globulin concentrations. The plasma glucose concentrations of the BET calves tended to decrease relative to CON cows. In conclusion, rumen-protected betaine supplementation from four weeks before expected calving tended to increase fat mobilization of postpartum dairy cows, and might improve the immunity of newborn calves.
本研究的目的是评估添加瘤胃保护型甜菜碱对产后奶牛生产性能及新生犊牛免疫力的影响。24头经产荷斯坦奶牛在根据前一泌乳周期的胎次和产奶量进行分组后，随机分为对照组（CON，n = 12）和瘤胃保护型甜菜碱组（BET，n = 12）。从预计产犊前四周至产后六周，对照组奶牛饲喂不添加甜菜碱的基础全混合日粮（CON），甜菜碱组奶牛饲喂每头每天添加20 g甜菜碱的基础全混合日粮（BET）。结果表明，添加甜菜碱对奶牛的干物质采食量和产奶量没有影响。与对照组奶牛相比，甜菜碱组奶牛产后的饲料效率（能量校正乳/干物质采食量）和体重损失有增加的趋势。产犊后第7天，甜菜碱组奶牛的血浆β-羟基丁酸浓度高于对照组奶牛。此外，与对照组犊牛相比，甜菜碱组犊牛的血浆总蛋白和球蛋白浓度更高。甜菜碱组犊牛的血浆葡萄糖浓度相对于对照组奶牛有降低的趋势。总之，从预计产犊前四周开始添加瘤胃保护型甜菜碱，有增加产后奶牛脂肪动员的趋势，并可能提高新生犊牛的免疫力。
