干旱区生态环境知识资源中心(Arid): Effects of supplementary feeding level on digestion and energy utilization by sheep and goats grazing arid-area rangelands

Arid

DOI	10.1016/j.anifeedsci.2020.114695
	Effects of supplementary feeding level on digestion and energy utilization by sheep and goats grazing arid-area rangelands
	Askar, A. R.; Salama, R.; El-Shaer, H. M.; Raef, O.
通讯作者	Askar, AR (corresponding author), Desert Res Ctr, Anim & Poultry Nutr Dept, Cairo 11753, Egypt.
来源期刊	ANIMAL FEED SCIENCE AND TECHNOLOGY
ISSN	0377-8401
EISSN	1873-2216
出版年	2021
卷号	271
英文摘要	An experiment was implemented to examine differences between sheep and goats in the utilization of open arid-area rangelands when provided with different concentrate supplement levels. Fifty-two non-lactating females (Abu-duleik sheep, n = 26 and Balady goats, n = 26) were employed in a 90-day experimental period. Animals of each species were allocated randomly into two treatments, according to a 2 x 2 factorial arrangement, with animal species (goats and sheep) and concentrate level (low and high) as main factors. They were grazing widely over the arid-area rangelands with a limited amount of a concentrate supplement, low (1 % BW) or high (2 % BW) (DM basis). Total energy expenditure was estimated by heart rate (HR) monitors for 48 h after its calibration by oxygen consumption with a face mask open-circuit respiratory system. However, the significant interaction between animal species and concentrate levels of supplement indicated that increasing the concentrate level had a negative effect (P < 0.05) on forage intake (22.8 vs. 17.0 +/- 1.58 g/ kg BW, for goats supplemented with low or high concentrate level, respectively) and digestibility by grazing goats. The reduction in goat's digestibility was mainly attributed to the reduction (P < 0.01) in fiber fraction digestibility (546 vs. 441 +/- 24.0 g/ kg dry matter intake, respectively). The contrary was observed in sheep in which the greatest forage consumption and digestibility were observed in grazing sheep supplemented with a high concentrate level, including the fiber fraction digestibility. Total energy expenditure was similar between sheep and goats when supplemented with a low concentrate level (600 and 574 +/- 24.6 kJ/ kgBW0.75, respectively), while it was significantly (P < 0.01) greater for sheep than for goats when supplemented with a high level (776 vs. 577 +/- 24.6 kJ/ kg BW0.75, respectively). This was reflected in the energy balance (EB) that was negative and similar in sheep and goats at a low supplementation level (-55.2 and-64.3 +/- 14.27 kJ/ kg BW0.75, respectively, while sheep reported positive (P < 0.05) and greater EB than that of goats with a high level (71.5 vs. 2.7 +/- 14.27 kJ/ kg BW0.75, respectively). In conclusion, concentrate supplement is necessary to maintain animals without nutritional deterioration while grazing in the open arid-area rangelands, however, its effects on the ability to utilize a low quality forage differed between sheep and goats at a high supplementation level.
英文关键词	Small ruminant Arid rangeland Grazing Supplementation Energy utilization
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000612162700007
WOS关键词	FORAGE INTAKE ; DIET DIGESTIBILITY ; STOCKING RATE ; PERFORMANCE ; BEHAVIOR ; EXPENDITURE ; PASTURES ; PROTEIN
WOS类目	Agriculture, Dairy & Animal Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349451
作者单位	[Askar, A. R.; El-Shaer, H. M.; Raef, O.] Desert Res Ctr, Anim & Poultry Nutr Dept, Cairo 11753, Egypt; [Salama, R.] Al Azhar Univ, Fac Agr, Anim Prod Dept, Cairo, Egypt
推荐引用方式 GB/T 7714	Askar, A. R.,Salama, R.,El-Shaer, H. M.,et al. Effects of supplementary feeding level on digestion and energy utilization by sheep and goats grazing arid-area rangelands[J],2021,271.
APA	Askar, A. R.,Salama, R.,El-Shaer, H. M.,&Raef, O..(2021).Effects of supplementary feeding level on digestion and energy utilization by sheep and goats grazing arid-area rangelands.ANIMAL FEED SCIENCE AND TECHNOLOGY,271.
MLA	Askar, A. R.,et al."Effects of supplementary feeding level on digestion and energy utilization by sheep and goats grazing arid-area rangelands".ANIMAL FEED SCIENCE AND TECHNOLOGY 271(2021).