Phillips Hannah N, Moon Roger D, Sorge Ulrike S, Heins Bradley J
Department of Animal Science, University of Minnesota, Saint Paul, MN 55108, USA.
Department of Entomology, University of Minnesota, Saint Paul, MN 55108, USA.
Animals (Basel). 2020 Dec 18;10(12):2429. doi: 10.3390/ani10122429.
The objective of this study was to evaluate Freedom-Ranger broiler chickens as a method to control face fly ( De Geer) larvae in cow dung pats on pasture. Ninety-nine pats in three replicates were inoculated with first-instar larvae and exposed to one of four treatment conditions for 3 to 4 days: (1) an environment-controlled greenhouse (GH); (2) pasture without broilers (NEG); (3) pasture with 25 broilers stocked at a low density of 2.5 m of outdoor area per broiler (LOW); and (4) pasture with 25 broilers stocked at a high density of 0.5 m of outdoor area per broiler (HIGH). Broiler behaviors and weather conditions were recorded twice daily. Survival rates of larvae (mean, 95% CI) were similar for pats in the NEG (4.4%, 2-9%), LOW (5.6%, 3-11%), and HIGH (3.2%, 2-7%) groups, and was greatest for larvae reared in the GH (54.4%, 36-72%) group compared to all other groups. The proportion of broilers observed pasture ranging was 14.0% (6-28%) but was negatively related to solar radiation. Broilers were never observed foraging in pats. Results indicate that use of broilers may not be an effective method for controlling larvae of dung pat breeding flies.
本研究的目的是评估自由放养肉鸡作为一种控制牧场上牛粪堆中面蝇（De Geer）幼虫的方法。将99堆牛粪分成三组重复样本，接种一龄幼虫，并暴露于四种处理条件之一3至4天：（1）环境控制温室（GH）；（2）无肉鸡的牧场（NEG）；（3）每只肉鸡以2.5平方米室外面积的低密度饲养25只肉鸡的牧场（LOW）；（4）每只肉鸡以0.5平方米室外面积的高密度饲养25只肉鸡的牧场（HIGH）。每天记录两次肉鸡行为和天气状况。NEG组（4.4%，2 - 9%）、LOW组（5.6%，3 - 11%）和HIGH组牛粪堆中幼虫的存活率（均值，95%置信区间）相似，与所有其他组相比，在GH组（54.4%，36 - 72%）中饲养的幼虫存活率最高。观察到的在牧场中活动的肉鸡比例为14.0%（6 - 28%），但与太阳辐射呈负相关。从未观察到肉鸡在牛粪堆中觅食。结果表明，使用肉鸡可能不是控制牛粪堆滋生苍蝇幼虫的有效方法。
