Luteal function during the estrous cycle in arginine-treated ewes fed different planes of nutrition

Bass, Casie S.; Redmer, Dale A.; Kaminski, Samantha L.; Grazul-Bilska, Anna T.

doi:10.1530/rep-16-0526

Cited by 16 publications

(5 citation statements)

References 116 publications

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“…Currently, the endocrine values for progesterone around the estrous are used in ewes to synchronize the estrus cycle (Maksimović et Gaviria & Hernández (1994) informed maximum mean values of progesterone on day 12 of the estrous cycle in crossbred ewes in Colombia of 15 nmol/L, which are higher than the observed values in this study on day 14 (mean 10.9 nmol/L). Progesterone levels normally drop on day 14 of the ovine estrous cycle (Bass et al 2017), which agrees with the present work. Balaro et al (2015) reported progesterone profiles of Santa Ines ewes in winter and summer under the tropical conditions of the state of Rio de Janeiro (Brazil) They found that about 50 % of the ewes had mean progesterone concentrations under 3.2 nmol/L, confirming the low reproductive seasonality in Santa Ines ewes.…”

Section: Resultssupporting

confidence: 93%

Reproductive and fertility parameters of ewes from the Colombian tropical highlands

González¹,

Gaona²

2022

Rev. U.D.C.A Act. & Div. Cient.

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Two studies were conducted on sheep in the high tropics of Colombia to study reproductive and fertility parameters associated with animal growth in this ecological zone. In the first trial, 1,389 records were used to analyze, through descriptive statistics, the fertility parameters, the birth rate, and the yield per multiple births of three genetic groups of sheep: the native Criolla and Manchada Paramuna breeds, and they were compared with the imported race Blackface. In the second study, the duration of the estrous cycle was determined and serum progesterone values were determined during the estrous cycle in 19 Criolla x Romney Marsh crossbred ewes, in this experiment, five moments of the cycle were analyzed. The fertility rates found in the Criolla and Manchada Paramuna breeds were 73.1 and 72 %, respectively, and were higher than those of the Blackface sheep (65 %). Blackface ewes showed the highest incidence of multiple births (29 %) and Manchada Paramuna ewes had the highest birth rates (93.7 %). Criolla x Romney Marsh crossbred ewes recorded a mean duration of the estrous cycle of 17.8 d. The highest progesterone secretion (11.5 nmol/L) occurred on day 9 of the estrous cycle, while in the estrus phases, its value was 0.32 nmol/L. This study contributes to the knowledge of the reproductive aspects of Colombian native sheep

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Section: Resultssupporting

confidence: 93%

Reproductive and fertility parameters of ewes from the Colombian tropical highlands

González¹,

Gaona²

2022

Rev. U.D.C.A Act. & Div. Cient.

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“…Changes in gross and cellular morphometrics and serum concentration of metabolites and hormones in response to dietary treatments for this model have been reported previously ( Kaminski et al, 2015 ; Bass et al, 2017 ; Prezotto et al, 2020 ). Briefly, dietary treatments induced weight gain (9.6 ± 0.7 kg) in overfed ewes and weight loss (−13.9 ± 0.1 kg) in underfed ewes ( p ≤ 0.02).…”

Section: Resultssupporting

confidence: 75%

“…Animal care and dietary treatments were as previously described ( Kaminski et al, 2015 ; Bass et al, 2017 ). Briefly, a total of 48 Rambouillet-cross multiparous ewes (3–5 years of age and of similar genetic background) were housed individually (0.91 × 1.2 m pens) in a temperature-controlled room (14°C) with regulated light-dark cycle (12:12 h; lights on 0700 and off at 1900; initiated prior to the winter solstice).…”

Section: Methodsmentioning

confidence: 99%

Malnutrition alters protein expression of KNDy neuropeptides in the arcuate nucleus of mature ewes

Thorson,

Prezotto

2024

Front. Physiol.

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The neuropeptides kisspeptin, neurokinin B, and dynorphin A are imperative for the pulsatile secretion of gonadotropin-releasing hormone and luteinizing hormone to ultimately regulate reproductive cyclicity. A population of neurons co-expressing these neuropeptides, KNDy neurons, within the arcuate nucleus of the hypothalamus (ARC) are positioned to integrate energy status from afferent neuronal and glial cells. We hypothesized that KNDy-expressing neurons in the ARC of mature ewes are influenced by energy balance. To test this hypothesis, ovary-intact, mature ewes were fed to lose, maintain, or gain body weight and hypothalamic tissue harvested during the luteal phase of the estrous cycle. Fluorescent, multiplex immunohistochemistry with direct antibody conjugation was employed to identify and quantify neurons expressing a single neuropeptide, as well as for the first time report co-expression of kisspeptin, neurokinin B, and dynorphin A protein in the ARC. Previous reports using this population of ewes demonstrated that concentrations of insulin and leptin differed between ewes fed to achieve different body weights and that ewes fed to gain body weight had increased concentrations of progesterone. Moreover, within this population of ewes tanycyte density and cellular penetration into the ARC was increased in ewes fed to gain body weight. Within the current report we have revealed that the number of neurons in the ARC expressing kisspeptin, neurokinin B, and dynorphin A protein was increased in ewes fed to gain body weight. Moreover, the number of KNDy neurons in the ARC expressing all three neuropeptides within a single neuron was decreased in ewes fed to lose body weight and increased in ewes fed to gain body weight when compared to ewes fed to maintain body weight. The cumulative findings of this experimental model suggest that expression of kisspeptin, neurokinin B, and dynorphin A protein in the ARC during the luteal phase of the estrous cycle are influenced by energy balance-induced alterations in circulating concentrations of progesterone that drive changes in morphology and density of tanycytes to ultimately regulate central perception of global energy status. Moreover, these results demonstrate that changes in KNDy neurons within the ARC occur as an adaptation to energy balance, potentially regulated divergently by metabolic milieu via proopiomelanocortin afferents.

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“…While the results differed with Zeitoun et al, (19) who reported that injecting arginine pregnant ewes led to a decrease in growth hormone concentration during pregnancy. Bass et al, (23) confirmed that injecting arginine into mature ewes in anestrus phase resulted in a significant increase in growth hormone concentration within 15-30 minutes after injection .Refrences 1) Alawiy, I. K. M. and Al-Salmani, Th. R. M.…”

Section: -Growth Hormone Concentration (Table -5)mentioning

confidence: 85%

“…The results were similar with that of Yunta et al, (18) that giving arginine during pregnancy on the day 41 -146 which might be not stimulate the secretion of prolactin. Bass et al (23) confirmed that injecting arginine into mature, non-pregnant ewes significantly increased the concentration of prolactin. a. b. c. small letters within one row indicate significant differences between the treatments.…”

Section: -Concentration Of Prolactin (Table-4)mentioning

confidence: 90%

Effect of Arginine and Selenium with Vitamin E on WBC and the level of hormones in Iraqi ewes discharged

Alawiy¹,

Mohammed

Majeed

2019

AJVS

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This study was achieved in a special farm in Basaer village which lies on the right side of the Euphrates in Heet district l Anbar, Heet lies 70 K.M west Ramadi during the pesiod, From 17/4/2018 to 30/5/2018. 28 ewes aged 2-4 years of awassi with average weight 40-50 k.g. and a one lambing. All ewes were diagnosed by using the real-time Ultrasonography to make sure there is no pregnancy among the female before the experiment. All ewes were synchronized with intravaginal sponges impregnated with 60 mg MAP for 12 days before sponges withdrawal and eCG 500 IU (Novormon made in Argentina). The pregnant ewes were divided randomly and equally (7 each group) Into 4 groups The ewes in the first group were received an intramuscular injection of 160 Mµ of arginine 3 times daily. The second group were treated with 2ml/head a combination of selenium plus vitamin E (vitamin E 68mg/ml Selenium 1.5mg/ml). The third group was treated by injection of 160 Mµ of arginine and selenium with vitamin E 2 ml/head. The four groups were injected with normal saline which was considered as a control group. The ewes were inseminated by ram at the end of the hormonal program for five days. The samples of blood were taken from the Jugular vein at four-day treatment Also, In the 4, 10, 15, 18. The results of the experiment showed no significant deferent in WBC, Progesterone estrogen, growth hormone, prolactin, early of pregnancy in the treatment with the control group. The experiment showed a significant difference in the Progesterone concentration within a single treatment in three treatment without control. concluded from this study that use of arginine and selenium with vitamin E improves ewes health, increasing the progesterone to maintain pregnancy.

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Luteal function during the estrous cycle in arginine-treated ewes fed different planes of nutrition

Cited by 16 publications

References 116 publications

Reproductive and fertility parameters of ewes from the Colombian tropical highlands

Reproductive and fertility parameters of ewes from the Colombian tropical highlands

Malnutrition alters protein expression of KNDy neuropeptides in the arcuate nucleus of mature ewes

Effect of Arginine and Selenium with Vitamin E on WBC and the level of hormones in Iraqi ewes discharged

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