1 耿慧兰. 奶牛发情探测系统使用体会[J].中国奶牛,2012(13):74~75. 2 焦兴明. 母畜动物测情仪的研制[J]. 中国畜牧兽医,2009,36(7):221~223. 3 Adin G R,Solomon M,Nikbachat A,et al. Effect of feeding cows in early lactation with diets differing in roughageneutral detergent fiber content on intake behavior, rumination, and milk production[J]. J Dairy Sci,2009,92(7):3364~3373. 4 Brehme U,Stollberg U,Holz R,et al. ALT pedometer-a new sensor-aided measurement system for improvement in oestrus detection[J]. Res Agric Eng,2006,52:1~10. 5 Burfeind O,Schirmann K,von Keyserlingk M A,et al. Evaluation of a system for monitoring rumination in heifers and calves[J]. J Dairy Sci,2011,94(1):426~430. 6 DeVries T J,Beauchemin K A,Dohme F,et al. Repeated ruminal acidosis challenges in lactating dairy cows at high and low risk for developing acidosis: Feeding, ruminating, and lying behavior[J]. J Dairy Sci,2009,92(10):5067~5078. 7 Kaske M,Beyerbach M,Hailu Y,et al. The assessment of the frequency of chews during rumination enables an estimation of rumination activity in hay-fed sheep[J]. J Anim Physiol Anim Nutr (Berl),2002,86(3~4):83~89. 8 López-Gatius F,Santolaria P,Munder I,et al. Walking activity at estrus and subsequent fertility in dairy cows[J]. Theriogenology,2005,63(5):1419~1429. 9 Maekawa M,Beauchemin K A,Christensen A. Effect of concentrate level and feeding management on chewing activities, saliva production, and ruminal pH of lactating dairy cows[J]. J Dairy Sci,2002,85(5):1165~1175. 10 Reith S,Hoy S. Relationship between daily rumination time and estrus of dairy cows[J]. J Dairy Sci,2012,95(11):6416~6420. 11 Roelofs J B,van Eerdenburg F J,Soede N M,et al. Pedometer readings for estrous detection and as predictor for time of ovulation in dairy cattle[J]. Theriogenology,2005,64(8):1690~1703. 12 Schirmann K,Chapinal N,Weary D M,et al. Rumination and its relationship to feeding and lying behavior in Holstein dairy cows[J]. J Dairy Sci,2012,95(6):3212~3217. 13 Schirmann K,Chapinal N,Weary D M,et al. Short-term effects of regrouping on behavior of prepartum dairy cows[J]. J Dairy Sci,2011,94(5):2312~2319. 14 Yang W Z,Beauchemin K A. Physically effective fiber: Method of determination and effects on chewing, ruminal acidosis, and digestion by dairy cows[J]. J Dairy Sci,2006,89(7):2618~2633. |