干旱区生态环境知识资源中心(Arid): Increasing shade area in feedlot heifers during heat stress: physiological and performance parameters

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DOI	10.1007/s11250-022-03152-4
	Increasing shade area in feedlot heifers during heat stress: physiological and performance parameters
	Aguilar-Quinones, J. A.; Avendano-Reyes, Leonel; Macias-Cruz, U.; Guerra-Liera, J. E.; Vicente-Perez, R.; Gastelum-Delgado, M. A.; Barajas-Cruz, R.; Wittayakun, S.; Vicente-Perez, A.
通讯作者	Avendaño-Reyes, L
来源期刊	TROPICAL ANIMAL HEALTH AND PRODUCTION
ISSN	0049-4747
EISSN	1573-7438
出版年	2022
卷号	54 期号:2
英文摘要	Heat stress is a great challenge for feedlot operations established in arid zones. The aim of this study was to evaluate if increasing shade area in the pen improved physiological and productive variables in feedlot heifers under hot climate. A total of 510 European and Zebu heifers were randomly assigned to six pens which were divided in two treatments: (1) three pens with 100 heifers each with a shade area of 2.7 m(2)/head (control group [C]); and (2) three pens with 70 heifers each with a shade area of 3.7 m(2)/head (treated group [T]). Physiological variables respiratory frequency (RF) and body surface temperature (BST) of several anatomic regions were taken from 30 heifers per treatment (i.e., 10 heifers/pen). Feed intake on pen basis was recorded weekly and heifers were individually weighted on days 1, 26, and 66 of the study to calculate performance variables. Relative humidity (RH) and ambient temperature (AT) were recorded and used to estimate the temperature-humidity index (THI). Data was analyzed with analysis of variance. The average THI during the study was 81.7 units, which was categorized as dangerous heat stress. In both shaded areas, European heifers showed higher (P < 0.05) RF than Zebu heifers. In the afternoon, the temperature of head, neck, loin, paddle, and belly was higher (P < 0.05) in C compared with T. Heifers under T showed better (P < 0.05) daily weight gain (DWG), total weight gain (TWG), feed conversion (FC), and feed efficiency (FE) than heifers in C, with no effect on dry matter intake (DMI). Results indicate that during hot summer months, Zebu showed more tolerance to heat stress than European heifers; however, heifers under a shade area of 3.7 m(2)/head had better productive performance than those under a shade area of 2.7 m(2)/head during the finishing phase of the feedlot. Increasing the shade area in the finishing phase of beef cattle on feedlot improved some physiological and productive responses during heat stress.
英文关键词	Heifers Respiratory frequency Bos indicus Bos taurus Surface temperature
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000776089400002
WOS关键词	INFRARED THERMOGRAPHY ; BOS-TAURUS ; CATTLE ; TEMPERATURE ; RESPONSES ; BEHAVIOR ; EVENTS ; ACCESS
WOS类目	Agriculture, Dairy & Animal Science ; Veterinary Sciences
WOS研究方向	Agriculture ; Veterinary Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394741
推荐引用方式 GB/T 7714	Aguilar-Quinones, J. A.,Avendano-Reyes, Leonel,Macias-Cruz, U.,et al. Increasing shade area in feedlot heifers during heat stress: physiological and performance parameters[J],2022,54(2).
APA	Aguilar-Quinones, J. A..,Avendano-Reyes, Leonel.,Macias-Cruz, U..,Guerra-Liera, J. E..,Vicente-Perez, R..,...&Vicente-Perez, A..(2022).Increasing shade area in feedlot heifers during heat stress: physiological and performance parameters.TROPICAL ANIMAL HEALTH AND PRODUCTION,54(2).
MLA	Aguilar-Quinones, J. A.,et al."Increasing shade area in feedlot heifers during heat stress: physiological and performance parameters".TROPICAL ANIMAL HEALTH AND PRODUCTION 54.2(2022).