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Response of broiler chickens fed diets supplemented with a bioactive olive pomace extract from Olea europaea to an experimental coccidial vaccine challenge
Publicated to: Poultry Science. 100 (2): 575-584 - 2021-02-01 100(2), DOI: 10.1016/j.psj.2020.11.027
Authors: Herrero-Encinas, J; Menoyo, D; Blanch, M; Pastor, J J; Rochell, S J
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Abstract
© 2020 This study aimed to investigate an experimental procedure of coccidial challenge in battery cages and the anticoccidial effect of a bioactive olive pomace extract from Olea europaea (OE) in broiler chickens. To this end, four hundred 1-day-old male chicks were randomly assigned to 5 experimental treatments (10 cages/treatment; 8 birds/cage). One group was fed the control diet without any additives and not challenged (NCU). The other 4 groups were challenged and fed the control diet with no additives (NCC) or supplemented with 500 ppm of coccidiostat or with 500 or 1,500 ppm of OE. At 0, 7, and 14 d, all challenged birds, except the NCC group, were orally gavaged with a live Eimeria spp. oocyst vaccine at 1x, 4x, and 16x of the manufacturer's recommended dose, respectively. Feed intake (FI), body weight gain (BWG), and feed conversion ratio (FCR) were determined at 7, 14, 20, and 28 d. At 20 d of age, 1 bird per cage was euthanized to analyze duodenum and jejunum morphology, ileal mucosa gene expression, and plasma cytokine, alpha-1-acid glycoprotein, and carotenoid (CAR) concentrations. Coccidial vaccine challenge lowered BW (P < 0.05) throughout the trial, and reduced FI and BWG, except from 20 to 28d, and increased FCR from 0 to 7, 0 to 14, and 0 to 20 d. Birds in the NCC group had higher (P < 0.05) oocyst counts and lower (P < 0.05) CAR and villus height to crypt depth ratios compared with NCU birds. Overall, coccidia challenge caused the expected reductions in growth performance and gut integrity. While the coccidiostat reduced oocysts excretion, dietary OE or coccidiostat had no effects on performance or gut integrity. The attenuated inflammatory response observed for all the treatments following the third infection can be attributed to the adaptation or immunization to the repetitive exposure to Eimeria spp.Keywords
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Bibliometric impact. Analysis of the contribution and dissemination channel
The work has been published in the journal Poultry Science due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position 7/62, thus managing to position itself as a Q1 (Primer Cuartil), in the category Agriculture, Dairy & Animal Science. Notably, the journal is positioned above the 90th percentile.
From a relative perspective, and based on the normalized impact indicator calculated from World Citations from Scopus Elsevier, it yields a value for the Field-Weighted Citation Impact from the Scopus agency: 1.11, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 13, 2025)
Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-12-05, the following number of citations:
- WoS: 7
- Scopus: 9
Leadership analysis of institutional authors
This work has been carried out with international collaboration, specifically with researchers from: United States of America.
There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (HERRERO ENCINAS, JAVIER) .
the author responsible for correspondence tasks has been MENOYO LUQUE, DAVID.