定时人工授精方案中的早期黄体溶解诱导可提高肉牛的繁殖性能

IF 1.9 2区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Eduardo P. Silva , Alfredo Q. Antoniazzi , João B.S. Borges , Pedro L.J. Monteiro , Amanda B. Machado , Marcelo M. Dias , Valério V.M. Portela Junior , Milo C. Wiltbank
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引用次数: 0

摘要

本研究的目的是通过在非哺乳金牛(安格斯杂交种)肉牛的定时人工授精(TAI)方案中提前使用前列腺素 F2α (PGF)来延长发情期。第 0 天,奶牛(n = 489 头)接受阴道内 1 克黄体酮(P4)装置和 2 毫克苯甲酸雌二醇治疗。第 7 天,奶牛被随机分为两组:PGF7 组(n = 244;在 P4 装置移除前 24 小时注射 500 µg 氯前列醇钠)或 PFG8 组(n = 245;在 P4 装置移除时注射 500 µg 氯前列醇钠)。第 8 天,拆除 P4 装置,给奶牛注射 0.5 毫克环戊丙酸雌二醇。所有奶牛在第 10 天(P4 装置移除 48-50 小时后)接受 TAI。第 7 天接受 PGF 治疗的奶牛发情率更高(91.3% vs 79.1%;P = 0.0011),与方案开始时是否存在 CL 无关。与使用 PGF8 的奶牛相比,PGF7 组奶牛在第 8 天的循环 P4 浓度较低(1.86 vs 2.99 ng/mL;P < 0.001)。然而,在TAI时,不同处理的排卵前卵泡直径没有差异(11.9 vs 11.8 mm; P = 0.7881)。PGF7(63.9 vs 50.6 %;P = 0.0114)处理的奶牛每TAI妊娠率(P/TAI)高于PGF8处理的奶牛。在TAI时卵泡长达8.5毫米的奶牛中,PGF7和PGF8的发情率(33.3% vs 26.6%;P = 0.6427)和P/TAI(40% vs 26.6%;P = 0.3657)分别较低。在卵泡中等大小(8.5 至 11.9 毫米)的奶牛中,PGF7 处理的奶牛发情率(90.5% 对 80%;P = 0.033)和 P/TAI (62.2% 对 49%;P = 0.053)更高。在卵泡长达 12 mm 的奶牛中,PGF7 的发情率(99.1 % vs 93.3 %;P = 0.045)高于 PGF8,但 P/TAI 没有差异(68.2 % vs 59 %;P = 0.149)。对于第 8 天 P4 < 1.99 ng/mL 的奶牛,PGF7 和 PGF8 治疗奶牛的发情表现相似(92.6 % vs 90.4 %;P = 0.53),PGF7 治疗奶牛的 P/TAI 往往高于 PGF8 治疗奶牛(63 % vs 52.1 %;P = 0.076)。然而,在 P4 > 2 ng/mL 的奶牛中,PGF7 的发情表达(89 vs 67.5 %;P = 0.0005)和 P/TAI (64.8 vs 48.7 %;P = 0.021)均高于 PGF8。因此,通过诱导黄体溶解提前 24 小时而不是移除 P4 阴道内装置来延长发情期,可通过增加发情和 P/TAI 的表达来提高非哺乳周期性肉牛的繁殖力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Early induction of luteolysis in a timed AI protocol increases reproductive performance in beef cows

The aim of this study was to produce a longer proestrus by early administration of prostaglandin F2α (PGF) in a timed artificial insemination (TAI) protocol in non-suckling Bos taurus (Angus crossbreed) beef cows. On day 0, cows (n = 489) were treated with an intravaginal 1 g progesterone (P4) device and 2 mg of estradiol benzoate. On day 7, cows were randomized into two groups: PGF7(n = 244; 500 µg of sodium cloprostenol 24 h before P4 device removal) or PFG8 (n = 245; 500 µg of sodium cloprostenol at P4 device removal). On day 8, P4 device was removed and cows received 0.5 mg of estradiol cypionate. All cows were submitted to TAI on day 10 (48–50 hours after P4 device removal). Cows treated with PGF on day 7 had greater expression of estrus (91.3 vs 79.1 %; P = 0.0011), regardless of CL presence at beginning of the protocol. Cows from PGF7 group had lower circulating P4 concentrations on day 8 in comparison with PGF8 treated cows (1.86 vs 2.99 ng/mL; P < 0.001). However, preovulatory follicle diameter did not differ among treatments at TAI (11.9 vs 11.8 mm; P = 0.7881). Pregnancy per TAI (P/TAI) was greater for PGF7 (63.9 vs 50.6 %; P = 0.0114) than PGF8 treated cows. In cows with follicles <8.5 mm at TAI, expression of estrus (33.3 vs 26.6 %; P = 0.6427) and P/TAI (40 vs 26.6 %; P = 0.3657) were low in both PGF7 and PGF8 treated cows, respectively. In cows with medium follicle size (8.5 to 11.9 mm) PGF7 treated cows had greater expression of estrus (90.5 vs 80 %; P = 0.033) and P/TAI (62.2 vs 49 %; P = 0.053). In cows with follicles >12 mm, expression of estrus was greater for PGF7 than PGF8 treated cows (99.1 vs 93.3 %; P = 0.045), however P/TAI did not differ (68.2 vs 59 %; P = 0.149). In cows with P4 < 1.99 ng/mL on day 8, expression of estrus was similar between PGF7 and PGF8 treated cows (92.6 vs 90.4 %; P = 0.53), and P/TAI tended to be greater for PGF7 than PGF8 treated cows (63 vs 52.1 % P = 0.076). However, in cows with P4 > 2 ng/mL PGF7 cows had higher expression of estrus (89 vs 67.5 %; P = 0.0005) and P/TAI (64.8 vs 48.7 %; P = 0.021) than PGF8. Thus, increasing the proestrous period by inducing luteolysis 24 hours earlier than removing the P4 intravaginal device enhanced fertility in non-suckling cyclic beef cows by increasing expression of estrus and P/TAI.

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来源期刊
Domestic animal endocrinology
Domestic animal endocrinology 农林科学-奶制品与动物科学
CiteScore
5.50
自引率
4.80%
发文量
58
审稿时长
31 days
期刊介绍: Domestic Animal Endocrinology publishes scientific papers dealing with the study of the endocrine physiology of domestic animal species. Those manuscripts utilizing other species as models for clinical or production problems associated with domestic animals are also welcome. Topics covered include: Classical and reproductive endocrinology- Clinical and applied endocrinology- Regulation of hormone secretion- Hormone action- Molecular biology- Cytokines- Growth factors
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