相关实验视频

Updated: May 24, 2025

Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats

Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats

Published on: August 5, 2011

在按时人工授精之前用GnRH治疗的Bos taurus公牛中,流体功能和怀孕率

Julia Nobre Blank Camozzato^1,2, Bruna Favretto de Souza¹, João Marcello Rodrigues¹

¹Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

Reproduction in domestic animals = Zuchthygiene

|March 3, 2025

概括

在将孕激素输入阴道装置 (IVD) 移除后34小时内给予淋腺激素释放激素 (GnRH),并没有影响经过定时人工授精 (TAI) 的牛犊的生育能力或质功能. 怀孕率没有受到GnRH治疗的影响.

科学领域:

生殖内分泌学生殖内分泌学
畜牧业的生殖生殖方式
动物科学动物科学

背景情况:

定时人工授精 (TAI) 协议对于高效的牛养殖至关重要.
优化激素干预措施,如GnRH的管理,可能会改善TAI的结果.
与孕激素 (P4) 阴道内装置 (IVD) 移除相比,GnRH的准确时间是TAI协议中的一个关键因素.

研究的目的:

为了评估GnRH在P4IVD切除后34小时给药对牛肉母牛的卵泡动态和怀孕率的影响.
为了确定GnRH在这个特定时间点的管理是否会影响白细胞功能和TAI协议中的生育结果.

主要方法:

两项实验涉及赫里福德和布拉福德公牛进行.
实验1评估毛囊动力学和孕激素度后P4IVD去除,与或没有GnRH管理34小时后去除.
实验2评估了在接受相同TAI协议的较大雌牛群中怀孕率.

主要成果:

在对照组和用GnRH治疗组之间,在排卵前毛囊直径,毛囊生长,排卵率或孕激素度方面没有发现显著差异.
在对照组 (50.2%) 和用GnRH治疗 (50.2%) 组之间,怀孕率相同.
虽然体重和身体状况得分影响了对照组的怀孕率,但在接受GnRH治疗的组中没有观察到这种影响.

结论:

在牛中去除P4 IVD后34小时的GnRH给药,在接受雌激素酸盐治疗后,并没有改善白色细胞功能或生育能力.
在本 TAI 协议中,GnRH 给药的时间没有证明对生殖结果有有益影响.
可能需要进一步的研究来探索替代的GnRH给药时间或其他激素策略,以增强牛肉公牛的TAI成功.

关键词:

牛肉牛牛肉牛牛肉牛生育能力生育能力生育能力生育能力排卵排卵排卵是什么?怀孕怀孕怀孕怀孕怀孕有时间的人工授精.

更多相关视频

In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle

In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle

Published on: July 8, 2020

Author Spotlight: Surgical Methods and Outcomes in Oviductal Cloned Pig Embryo Transfers

Author Spotlight: Surgical Methods and Outcomes in Oviductal Cloned Pig Embryo Transfers

Published on: October 18, 2024

相关概念视频

Ovarian Cycle

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...

Hormonal Regulation of the Menstrual Cycle

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH...

Gonadal and Placental Hormones

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair...

Hormonal Control of the Ovarian Cycle

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle. At puberty, GnRH secretion increases in both frequency and...