在有不同屋顶的室外围栏中饲养的奶牛的行为变化

Q4 Veterinary
Jéssica Caetano Dias Campos, Roberta Passini, L. J. M. P. E. Sousa, A. Amaral
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引用次数: 0

摘要

摘要本研究评估了在不同土工合成材料覆盖的室外围栏中饲养的奶牛的行为。试验选用20头断奶的杂交犊牛(吉罗兰多、泽西和荷斯坦),平均初始活重40.6 Kg。采用完全随机区组设计,采用4 × 3因子方案,重复5次。屋面材料为聚乙烯网、排水土工复合材料、非织造土工布和编织土工布,代表第一个因素,评估时间(上午8点至11点,上午11点15分至下午2点,下午2点15分至6点)代表第二个因素。分析环境变量,计算热应力指标:黑球湿度指数(BGHI)和等效温度。平均BGHI和等效温度分别为79和26。行走行为在不同处理之间存在差异(P<0.05),且在编织土工布处理中更为频繁。一天中观察到的最常见的行为是躺在阴凉处(53%),这表明在生命的这个阶段提供人工遮阳的重要性。与聚乙烯网相比,排水土工复合材料和无纺布土工织物更适合为热带地区断奶的奶牛提供遮阳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Behavioral changes in dairy calves raised in outdoor holding pens with alternative roofing
Abstract This study assessed the behavior of dairy calves raised in outdoor holding pens covered with different geosynthetics. Twenty crossbred (Girolando, Jersey and Holstein) dairy calves undergoing weaning were used, with an average initial live weight of 40.6 Kg. A completely randomized block design was used, with a 4 x 3 factorial scheme and 5 repetitions. The roofing materials were polyethylene mesh, drainage geocomposite, nonwoven geotextile and woven geotextile, representing the first factor, and assessment times (8 to 11 a.m., 11:15 a.m. to 2 p.m. and 2:15 to 6 p.m.) the second factor. Environmental variables were analyzed, and the following heat stress indices calculated: black globe-humidity index (BGHI) and equivalent temperature. The average BGHI and equivalent temperature were 79 and 26, respectively. Walking behavior differed between treatments (P<0.05) and was more frequent in the woven geotextile treatment. The most frequent behavior observed throughout the day was lying in the shade (53%), demonstrating the importance of providing artificial shading during this stage of life. When compared to polyethylene mesh, the drainage geocomposite and nonwoven geotextile were better suited to providing shade for dairy calves undergoing weaning in tropical regions.
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来源期刊
Ciencia Animal Brasileira
Ciencia Animal Brasileira Veterinary-Veterinary (all)
CiteScore
0.50
自引率
0.00%
发文量
44
审稿时长
28 weeks
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