Ambient Conditions and Feeding Strategy Influence delta O-18 of Milk Water in Cows (Bos taurus)

作者：Chen Guo; Schaeufele Rudi; Auerswald Karl^*

来源：Journal of Agricultural and Food Chemistry, 2017, 65(34): 7387-7395.

DOI：10.1021/acs.jafc.7b02482

• proficiency
• animal environment
• animal keeping
• silage
• grass

There are increasing concerns by consumers regarding agricultural product traceability and authenticity. Oxygen isotope composition (delta(18)o) has been used in this context based on the relationship between delta(18)o of animal, products and annual precipitation. However, in dairy products this relationship is affected by the seasonality of delta(18)o in milk water which in turn depends on the feeding system used. We measured 608 milk samples from 28 farms with various feeding strategies in southern Germany throughout the year, investigating the influences of ambient conditions, drinking water source, and feeding strategies on seasonal variation of delta(18)o in milk water (delta(milk)). The mechanistic Munich-Kohn model reflecting these influences predicted the seasonal and farm-specific variation of delta(milk) well. The relationship between delta(18)o of precipitation and delta(milk) varied in different feeding strategies. The interplay of ambient conditions and feeding strategy on delta(milk) should thus be carefully considered when identifying the origin of milk.

• 出版日期2017-8-30