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Preference of intake of different tree leaves preserved with drying and ensiling by nyala antelope ( Tragelaphus angasii )
Zoo Biology ( IF 1.2 ) Pub Date : 2020-09-15 , DOI: 10.1002/zoo.21570
Marcin Przybyło 1 , Sylwia Kazek 1 , Alina Kloska 2 , Jan B Pyś 1 , Paweł Górka 1
Affiliation  

It is recommended that browse should be an important part of diets for browsing and intermediate feeding type ruminants. However, provision of browse in winter time is problematic for many zoos located in the temperate climate. Drying or freezing of branches are commonly practiced solutions to this problem, but ensiling of tree leaves could also be an attractive option. The aim of this study was to determine the effect of drying and ensiling of different tree leaves on preference of their intake by nyala antelope (Tragelaphus angasii), an intermediate feeding type ruminant. A study was conducted on five nyala fed a standard diet (meadow hay, dehydrated chopped lucerne and limited concentrates) before and during the study. Preference of intake of five feeds was tested: dried maple (A. platanoides), oak (Q. robur), willow (S. alba), and ensiled maple and lime (T. cordata) leaves. Each day two tested feeds were offered to each animal. After 4 h of presentation, feed refusals were weighed and preference ratio for each tested feed and animal was calculated. Then, preferences were ranked using a pairwise comparison chart. Dried maple and oak leaves were preferred more than other leaves whereas ensiled lime leaves were the least preferred. On the other hand, ensiled and dried maple leaves were equally preferred. Results of this study showed that palatability of ensiled tree leaves should not be a concern when feeding nyala, and likely also other browsing or intermediate feeding type ruminants, but palatability of silage may depend on the species of tree.

中文翻译:

尼亚拉羚羊(Tragelaphus angasii)对干燥青贮保存的不同树叶的摄食偏好

建议浏览应该是浏览和中间喂养型反刍动物饮食的重要组成部分。然而,对于许多位于温带气候的动物园来说,在冬季提供浏览是有问题的。干燥或冷冻树枝是解决这个问题的常用方法,但青贮树叶也可能是一个有吸引力的选择。本研究的目的是确定不同树叶的干燥和青贮对尼亚拉羚羊(Tragelaphus angasii)(一种中间喂养型反刍动物)的摄食偏好的影响。在研究之前和期间,对五只用标准饮食(草甸干草、脱水切碎的苜蓿和有限的浓缩物)喂食的尼亚拉进行了研究。测试了五种饲料的摄入偏好:干枫树 (A. platanoides)、橡树 (Q. robur)、柳树 (S. alba)、青贮枫和酸橙 (T. cordata) 叶。每天向每只动物提供两次测试饲料。展示 4 小时后,称重拒绝饲料,并计算每种测试饲料和动物的偏好比率。然后,使用成对比较图表对偏好进行排名。干枫叶和橡树叶比其他叶子更受欢迎,而青柠叶最不受欢迎。另一方面,青贮和干燥的枫叶同样受欢迎。这项研究的结果表明,青贮树叶的适口性在喂养尼亚拉时不应该是一个问题,其他浏览或中间喂养类型的反刍动物也可能是一个问题,但青贮饲料的适口性可能取决于树木的种类。称重拒绝饲料,并计算每种测试饲料和动物的偏好比率。然后,使用成对比较图表对偏好进行排名。干枫叶和橡树叶比其他叶子更受欢迎,而青柠叶最不受欢迎。另一方面,青贮和干燥的枫叶同样受欢迎。这项研究的结果表明,青贮树叶的适口性在喂养尼亚拉时不应该是一个问题,其他浏览或中间喂养类型的反刍动物也可能是一个问题,但青贮饲料的适口性可能取决于树木的种类。称重拒绝饲料,并计算每种测试饲料和动物的偏好比率。然后,使用成对比较图表对偏好进行排名。干枫叶和橡树叶比其他叶子更受欢迎,而青柠叶最不受欢迎。另一方面,青贮和干燥的枫叶同样受欢迎。这项研究的结果表明,青贮树叶的适口性在喂养尼亚拉时不应该是一个问题,其他浏览或中间喂养类型的反刍动物也可能是一个问题,但青贮饲料的适口性可能取决于树木的种类。干枫叶和橡树叶比其他叶子更受欢迎,而青柠叶最不受欢迎。另一方面,青贮和干燥的枫叶同样受欢迎。这项研究的结果表明,青贮树叶的适口性在喂养尼亚拉时不应该是一个问题,其他浏览或中间喂养类型的反刍动物也可能是一个问题,但青贮饲料的适口性可能取决于树木的种类。干枫叶和橡树叶比其他叶子更受欢迎,而青柠叶最不受欢迎。另一方面,青贮和干燥的枫叶同样受欢迎。这项研究的结果表明,青贮树叶的适口性在喂养尼亚拉时不应成为问题,其他浏览或中间喂养类型的反刍动物也可能存在问题,但青贮饲料的适口性可能取决于树木的种类。
更新日期:2020-09-15
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