Efficacy of various five-day estrous synchronization protocols in sheep

Oliveira

et al. 2020

Acta Sci. Anim. Sci.

The objective of this study was to evaluate the effect of different hormonal protocols on the reproductive performance of Santa Inês ewes in Amazon environmental conditions. Twenty-two Santa Inês ewes between 3 and 4 years-old were distributed in a randomized block experimental design, where the treatments consisted of two protocols for estrus synchronization (short and long) with eleven animals each. Data on the occurrence of estrus were described for each protocol. Data of estrus, pregnancy, and prolificity were firstly subjected to ANOVA and a subsequent Tukey’s test. Results were considered significant at p ≤ 0.05. The short-term protocol presented an interesting successful rate, where above 70% ewes tested had estrus. The long-term protocol also achieved a high successful rate, where above 80% ewes tested had estrus. However, comparing the protocols, the long-term protocol presented better results of positive estrus and pregnancy rates in ewes. Thus, it can be concluded that both protocols presented satisfactory results regarding estrus manifestation, and prolificity (lambs produced per ewe). However, under Amazon environmental conditions, the long-term protocol presented better results regarding positive manifestation of estrus and pregnancy rate.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of different protocols for estrus synchronization on reproductive performance of Santa Inês ewes under Amazon environmental conditions

Oliveira

et al. 2020

Acta Sci. Anim. Sci.

“…The time to onset of estrus reported in the present study ranged from 25 to 36 h in ewes and 36 to 48 h in does following CIDR removal that is coincident with Didarkhah and Mesgaran (2013) who mentioned that the time to onset of estrus ranged from 28 to 55 h following CIDR removal. In this regard, Jackson et al, (2014) reported that the time to the onset of heat in short term CIDR synchronization in ewes and does was 60-108 hours. Our results were coincident with Hashemi et al, (2006) who found that long term synchronization protocol was associated with shorter interval required to onset of estrus compared to those of shorter term of CIDR in ewes and does.…”

Section: Discussionmentioning

confidence: 99%

CIDR and Ultrasound-Fetometry Scan; Comparative Study Between Sheep and Goat in Egypt

Ahmed¹,

El-Naeim²,

Ibrahim³

2017

AJVS

Key words:CIDR, CRL, BPD, FOD, Progesterone, PMSG, Ultrasound.The present study aims to evaluate the impact of controlled internal drug release (CIDR) in combination with prostaglandin F2α (PGF2α) and pregnant mare serum gonadotropin (PMSG) treatments on reproductive performance of dairy ewes and does besides, evaluation the accuracy of pregnancy diagnosis during the breeding season. Twenty female animals divided as Ossimi ewes (n=10) and Baladi does (n=10) were subjected to ovsynch regimen. Ultrasonographic examinations were conducted weekly using realtime B-mode ultrasound scanner by transrectal linear and transabdominal convex probes starting from day 14 post service. This study showed that estrus response was 100% in both ewes and does. The conception rates were 90% in ewes and 80 % in does. The incidence of twining was higher in ewes when compared to that in does with incidence rate 67% and 50 in ewes and does, respectively. The accuracy of ultrasound examination for determining fetal number was 100% for single and twin pregnancy. The birth rate was 100 % for both species; and this was confirmed at lambing / kidding. In conclusion, our results indicate that using biotechnologies such as ovsynch regimen and pregnancy diagnosis by ultrasonography are useful to improve the management of reproduction in ewes and does.

Sex Hormones in Neurodegenerative Processes and Diseases

“…As a general principle, these effects of progesterone can be used in estrus synchronization protocols [46][47][48]. Medroxyprogesterone acetate (MAP), fluorogestone acetate (intravaginal sponge), melengestrol acetate, levonorgestrel, and intravaginal progesterone-releasing devices (CIDR and DICO) are used for estrus synchronization in sheep and goats [48][49][50][51][52][53][54][55].…”

Section: Use Of Progesterone In Estrus Synchronization In Small Ruminmentioning

confidence: 99%

Clinical Use of Progesterone and Its Relation to Oxidative Stress in Ruminants

Kuru¹,

Kükürt²,

Oral³

et al. 2018

Studies to determine the physiological effects and functions of progesterone started in the twentieth century. Progesterone is a steroid-structured hormone with 21 carbon atoms originating from cholesterol. The corpus luteum, formed after ovulation in ruminants, secretes progesterone, which plays a role in the continuity of the pregnancy. Progestagens can be used for estrus synchronization in cows and heifers. Similarly, they are used for estrus synchronization during the breeding season or outside the breeding season by taking advantage of the negative feedback effect of progesterone in small ruminants. It is applied for the treatment of embryonic deaths due to luteal insufficiency in cows with high milk yield. In anovulatory anestrus, exogenous progesterone applications can be very useful. Progesterone treatment contributes to the resolution of the anestrus by rearranging hypothalamic functions in cattle with follicular cysts. The oxidative stress index in the luteal phase, when progesterone is high in ruminants, is higher than in the follicular phase. In the critical period of pregnancy, a high index of oxidative stress-induced progesterone causes embryonic death. Factors that cause stress in high milk-yielding cows can affect the amount of progesterone synthesis by inhibiting luteal cell function due to excessive free radical production.