Daros Ruan R, Bran José A, Hötzel Maria J, von Keyserlingk Marina A G
Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Laboratório de Etologia Aplicada e Bem-Estar Animal, Departamento de Zootecnia e Desenvolvimento Rural, Universidade Federal de Santa Catarina, Florianópolis 88040-900, Brazil.
Animals (Basel). 2019 Feb 5;9(2):48. doi: 10.3390/ani9020048.
In this cross-sectional study, we measured the association between water provision and milk production on intensively managed small-scale grazing dairy herds. Farms ( = 53) were categorized according to water provision as follows: (1) Restricted-cows did not have access to a water trough while on pasture; and (2) Unrestricted-cows had free access to a water trough while on pasture. Herd main breed and feeding practices were included in a model to assess the effect of water provision category on farm average milk yield/cow/d. The effect of pasture condition and environmental variables on milk production were also assessed, however were not retained on the final model. Herds provided with unrestricted access to drinking water produced on average 1.7 L more milk per cow/d ( = 0.03) than herds with restricted access to drinking water. Predominantly Holstein herds produced 2.8 L more milk per cow/d ( < 0.01) than non-Holstein herds. Each extra kg of concentrate offered per day increased milk yield by 1.1 L/cow/d ( < 0.01). In conclusion, providing free access to drinking water while grazing was associated with greater milk production.
在这项横断面研究中，我们测量了集约化管理的小规模放牧奶牛群中水供应与产奶量之间的关联。根据水供应情况将农场（n = 53）分为以下几类：（1）受限组——奶牛在牧场时无法使用水槽；（2）不受限组——奶牛在牧场时可自由使用水槽。在一个模型中纳入了牛群的主要品种和饲养方式，以评估水供应类别对农场平均每头奶牛每天产奶量的影响。还评估了牧场条件和环境变量对产奶量的影响，但最终模型中未保留这些因素。与饮水受限的牛群相比，饮水不受限的牛群平均每头奶牛每天多产奶1.7升（P = 0.03）。以荷斯坦牛为主的牛群比非荷斯坦牛群平均每头奶牛每天多产奶2.8升（P < 0.01）。每天每多提供1千克精饲料，产奶量增加1.1升/头/天（P < 0.01）。总之，放牧时提供自由饮水与更高的产奶量相关。
