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Patch discrimination as a function of handling time

机译：补丁识别与处理时间的关系

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We tested male broiler chickens in 3 experimental group sizes (GS) to examine the mediating effects of GS and feed handling time on patch choice. We tested the experimental GS in a 3-patch discrimination trial with patches that contained identical amounts of feed but differed in the proportion of inedible filler material (wood shavings) added. The patch requiring the least handling time offered the highest profitability and was composed of 25% filler and 75% feed (by volume), whereas the mid and low profitability patches contained 50 and 75% filler, respectively. Food consumption, foraging duration, patch residence time, number of foraging bouts, and number of discrete patch visitors were significantly greater at the more profitable patches, requiring less handling time. We found a greater number of birds exploiting all 3 patches at larger GS, although we did not detect a parallel increase in aggression. On the contrary, aggression increased only as handling time decreased. These results suggest that at large GS resource monopolization did not occur; birds were most likely involved in scramble competition, particularly at the more profitable patches. Our findings show that broilers are able to discern the handling time required to obtain nutritious feed and adjust their foraging behavior according to the number of competitors.
机译：我们在3个实验组大小（GS）中测试了雄性肉鸡，以检验GS的介导作用和饲料处理时间对贴片选择的影响。我们在3个斑块的鉴别试验中测试了实验性GS，其中的斑块包含相同的饲料量，但添加的不可食填料（刨花）的比例不同。需要最少处理时间的贴片提供最高的获利能力，由25％的填充料和75％的饲料（按体积计）组成，而中低利润的贴片分别包含50％和75％的填充料。在利润更高的补丁上，食物消耗，觅食持续时间，补丁停留时间，觅食回合数和单独补丁访问者的数量显着增加，所需的处理时间更少。我们发现有较大数量的鸟在较大的GS处利用所有3个斑块，尽管我们没有发现侵略性同时增加。相反，侵略性只会随着处理时间的减少而增加。这些结果表明，在一般情况下，GS资源并未发生垄断。鸟类最有可能参与争夺比赛，尤其是在利润更高的地区。我们的发现表明，肉鸡能够辨别获得营养饲料所需的处理时间，并根据竞争者的数量来调整其觅食行为。

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