Residues of Pesticides in Dairy Cow Rations and Fly Treatments Reduce Number of Coleoptera in Dung

• DOI: 10.2139/ssrn.4128994
• Publication Date: 2022-06-07T18:53:20Z
• Authors: Martine Bruinenberg; Maaike van Agtmaal; Nyncke Hoekstra; N. van Eekeren
• Keywords: Cow dung

There is an overall pattern of a decline in insect abundance and diversity. The presence residues pesticides animal feeds fly treatments may results pollution dung, which hamper the survival insects feeding breeding on dung. To study route from pesticide contamination feed dung to pats, two experiments were performed. In Experiment 1, dairy cows collected eight Dutch farms (six conventional, organic). All ration analysed for pesticides. 2, was herd spiked with four concentrations deltamethrin. both experiments, field experiment implemented artificial pats 2 kg fresh retrieved after 7 14 days (Experiment 1), or 7, 14, 21, 35 2), invertebrates counted. total 70 detected different farms. concentration average 423 µg -1 DM (range 112 1980 DM). 1 number Coleoptera present negatively correlated concentration, more organic (23.7 vs. 11.4 per 500 g freshy deposited dung). no deltamethrin contained than times larvae adults (5.6 freshly treatment without 2.2 highest It concluded that are widely those transferred have negative effect as consequence also affect ecosystem services such disappearance farm birds.