Type of CIDR but not eCG administration affected pregnancy per AI in Holstein heifers subjected to a 5-day estrus synchronization protocol
This study compared the effects of CIDR type and eCG treatment on ovarian follicular dynamics, estrus response and pregnancy per AI (P/AI) in Holstein heifers subjected to a 5-d estrus synchronization protocol. On Day 0, heifers (n = 133) received either a new or a once-used CIDR. On Day 5, CIDR was...
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| Veröffentlicht in: | Journal of Applied Animal Research 2022-12, Vol.50 (1), p.504-510 |
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| creator | Sanz, Albina Gobikrushanth, Mohanathas Colazo, Marcos G. |
| description | This study compared the effects of CIDR type and eCG treatment on ovarian follicular dynamics, estrus response and pregnancy per AI (P/AI) in Holstein heifers subjected to a 5-d estrus synchronization protocol. On Day 0, heifers (n = 133) received either a new or a once-used CIDR. On Day 5, CIDR was removed, 500 μg cloprostenol administered and heifers received or not 300 IU eCG (2 × 2 design). Heifers in estrus were inseminated 12 h after first observation. All heifers without estrus by 84 h after CIDR removal received 100 μg GnRH concurrently with AI. Ultrasonography was done in a subset of 77 heifers at CIDR insertion and removal, at AI and every 12 h after AI to determine follicular dynamics. Diameter of largest follicle at CIDR removal and AI was larger in heifers given a used CIDR (P |
| doi_str_mv | 10.1080/09712119.2022.2106989 |
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On Day 0, heifers (n = 133) received either a new or a once-used CIDR. On Day 5, CIDR was removed, 500 μg cloprostenol administered and heifers received or not 300 IU eCG (2 × 2 design). Heifers in estrus were inseminated 12 h after first observation. All heifers without estrus by 84 h after CIDR removal received 100 μg GnRH concurrently with AI. Ultrasonography was done in a subset of 77 heifers at CIDR insertion and removal, at AI and every 12 h after AI to determine follicular dynamics. Diameter of largest follicle at CIDR removal and AI was larger in heifers given a used CIDR (P < .05). The overall estrus response and ovulation (85.0 and 95.5%) did not differ between CIDR types, heifers given a new CIDR had greater P/AI (67.2 vs. 42.6%; P = .004). In summary, P/AI was reduced in dairy heifers treated with a used CIDR, despite having larger preovulatory follicles at AI. In addition, eCG treatment did not affect follicular dynamics, estrus response nor P/AI.</description><identifier>ISSN: 0971-2119</identifier><identifier>EISSN: 0974-1844</identifier><identifier>DOI: 10.1080/09712119.2022.2106989</identifier><language>eng</language><publisher>Abingdon: Taylor & Francis</publisher><subject>Barley ; Beef ; Cattle ; eCG ; Estrus ; Fertility ; Follicles ; follicular development ; Gonadotropin-releasing hormone ; Ovaries ; Ovulation ; Pregnancy ; shortened protocol ; Synchronization ; timed-AI</subject><ispartof>Journal of Applied Animal Research, 2022-12, Vol.50 (1), p.504-510</ispartof><rights>2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group 2022</rights><rights>2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This work is licensed under the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (the “License”). 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| subjects | Barley Beef Cattle eCG Estrus Fertility Follicles follicular development Gonadotropin-releasing hormone Ovaries Ovulation Pregnancy shortened protocol Synchronization timed-AI |
| title | Type of CIDR but not eCG administration affected pregnancy per AI in Holstein heifers subjected to a 5-day estrus synchronization protocol |
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