Effect of level of dietary energy and protein on embryo survival and progesterone production on day eight of pregnancy in Rasa Aragonesa ewes

Abecia, J.A.; Lozano, Jorge; Forcada, F.; Zarazaga, L.A.

doi:10.1016/s0378-4320(97)00021-3

Cited by 58 publications

(40 citation statements)

References 13 publications

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“…In the present study the total body weight gain of ewes fed the high-energy diet at premating was higher than that of ewes fed the low-energy diet. The response to nutritional treatment of animals depends on liveweight, body condition (Nottle et al, 1997;Rhind and McNeilly, 1998), potential reproductive performance and genotype (Abecia et al, 1997;Wilkins, 1997) of the animals, and the actual number of ova released at oestrus is highly dependent on the nature of ewe's long-term nutritional regiments (Nottle et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Koyuncu¹,

Canbolat²

2009

J. Anim. Feed Sci.

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The objective of the study was to determine the effects of four dietary energy levels (L 1 -10.3, L 2 -11.0, L 3 -11.6 and L 4 -12.2 MJ ME per kg DM) on oestrus synchronization and fertility in Kivircik ewes. Eighty Kivircik ewes were randomly allocated in equal numbers to the four dietary energy treatments. The groups were treated with intra vaginal sponges containing 40 mg FGA (fluorogestone acetate) for a period of 14 days and 500 IU pregnant mare serum gonadotropin was injected intramuscularly after sponge withdrawal.The proportion of ewes exhibiting overt oestrus within 96 h after the injection was significantly lower (P<0.05) in the L 1 and L 2 eves (86 and 89 %) than in those on the L 3 (100%) and L 4 (100%) treatments, respectively. Mean litter size and fecundity were higher (P<0.05) in the L 3 (1.95) and L 4 (2.05) compared with the L 1 (1.45 and 1.25) and L 2 (1.63 and 1.55) ewes. It is concluded that shortterm (21 days) in the level of dietary energy supplementation pre-mating can have a beneficial effect on reproductive performance in ewes.

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Section: Discussionmentioning

confidence: 99%

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Koyuncu¹,

Canbolat²

2009

J. Anim. Feed Sci.

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“…Furthermore, the veins from the contralateral ovary without a CL showed a mean progesterone concentration 30 times lower (ipsilateral 3297 ± 439 nmol/l; contralateral 95 ± 35 nmol/l; P < 0.001), showing that the local concentration of progesterone that may exert an immediate local effect on the endometrium is considerably higher than that observed in the peripheral circulation. This point is further strengthened by the observation that the mean progesterone concentration in the uterine vein was approximately 30-fold higher than in jugular vein and similar in both uterine horns [24].…”

Section: Local Effect Versus Systemic Effect Of Progesteronementioning

confidence: 86%

“…Since the CL is the main source of progesterone, studies in sheep have demonstrated that the mean progesterone concentration in the ovarian vein draining a CL-containing ovary was 800-fold higher than mean jugular venous levels [24]. Furthermore, the veins from the contralateral ovary without a CL showed a mean progesterone concentration 30 times lower (ipsilateral 3297 ± 439 nmol/l; contralateral 95 ± 35 nmol/l; P < 0.001), showing that the local concentration of progesterone that may exert an immediate local effect on the endometrium is considerably higher than that observed in the peripheral circulation.…”

Section: Local Effect Versus Systemic Effect Of Progesteronementioning

confidence: 99%

Micro-dose hCG as luteal phase support without exogenous progesterone administration: mathematical modelling of the hCG concentration in circulation and initial clinical experience

Andersen

Fischer²,

Giorgione

et al. 2016

J Assist Reprod Genet

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For the last two decades, exogenous progesterone administration has been used as luteal phase support (LPS) in connection with controlled ovarian stimulation combined with use of the human chorionic gonadotropin (hCG) trigger for the final maturation of follicles. The introduction of the GnRHa trigger to induce ovulation showed that exogenous progesterone administration without hCG supplementation was insufficient to obtain satisfactory pregnancy rates. This has prompted development of alternative strategies for LPS. Augmenting the local endogenous production of progesterone by the multiple corpora lutea has been one focus with emphasis on one hand to avoid development of ovarian hyper-stimulation syndrome and, on the other hand, to provide adequate levels of progesterone to sustain implantation. The present study evaluates the use of micro-dose hCG for LPS support and examines the potential advances and disadvantages. Based on the pharmacokinetic characteristics of hCG, the mathematical modelling of the concentration profiles of hCG during the luteal phase has been evaluated in connection with several different approaches for hCG administration as LPS. It is suggested that the currently employed LPS provided in connection with the GnRHa trigger (i.e. 1.500 IU) is too strong, and that daily micro-dose hCG administration is likely to provide an optimised LPS with the current available drugs. Initial clinical results with the microdose hCG approach are presented.

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“…Similarities in the concentrations of plasma and milk P4 between two groups in this study were more likely to be associated with the level of faecal output rather than level of milk yield. It has been shown [1,2] that neither luteal function nor ovarian venous P4 levels are modified by level of nutrition in sheep, indicating that P4 production is not affected by the level of feed intake. Blood flow rate through the liver is around 50% higher in normal fed, lactating cows as compared with non-lactating cows, and is decreased by fasting (14).…”

Section: Pp4mentioning

confidence: 99%

Excretion rate of progesterone in milk and faeces in lactating dairy cows with two levels of milk yield

2001

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-This study was conducted to measure the effect of the level of daily milk yield on the excretion rate of progesterone (P4) in milk and faeces in high-producing (HP) and low-producing (LP) lactating dairy cows. A GnRH-agonist was implanted to block endogenous production of P4. A CIDR device was inserted into the vagina and left in place for 11 days. The average and peak milk yields were greater in HP cows (P < 0.0001). Mean plasma concentrations of P4 were also similar in both groups (P = 0.44), even though the average mass of P4 delivered from a CIDR device was higher with HP cows (P = 0.02). Average milk P4 concentration was similar in both groups (P = 0.81), so that average daily excretion of P4 in the milk was greater with HP cows (P = 0.05). The concentrations (P = 0.83) and daily yields (P = 0.4) of total faecal progesterone metabolites were not affected by level of milk yield. These data show that the concentrations of plasma and milk P4, and the concentration and yield of P4 metabolites are not affected by the levels of daily milk yield.progesterone / faecal progesterone metabolite / dairy cow Résumé -Taux d'élimination de la progestérone dans le lait et les fèces des vaches laitières selon leur production de lait. Cette étude a pour but de mesurer le taux d'élimination de la progestérone (P4) dans le lait et les fèces chez des vaches à haute (HP) ou basse (LP) production laitière quotidienne. Un agoniste de GnRH a été implanté pour bloquer la production endogène de P4. Un dispositif CIDR a été inséré dans le vagin et laissé en place pendant 11 jours. Les productions laitières moyennes ou maximum ont été plus élevées (P < 0,0001) chez les vaches HP que chez les LP. Dans le plasma, les concentrations moyennes de P4 ont été similaires dans les deux lots (P = 0,44) bien que la quantité moyenne de P4 libérée par le CIDR ait été plus élevée chez les vaches HP (P = 0,02). Dans le lait, la concentration moyenne de P4 a été équivalente dans les deux lots (P = 0,81). Ceci signifie que l'excrétion moyenne de P4 dans le lait a été supérieure chez les vaches HP par comparaison aux LP (P = 0,05). Les concentrations (P = 0,83) et les excrétions journalières (P = 0,40) des métabolites fécaux Reprod. Nutr. Dev. 41 (2001) [309][310][311][312][313][314][315][316][317][318][319] 309

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Effect of level of dietary energy and protein on embryo survival and progesterone production on day eight of pregnancy in Rasa Aragonesa ewes

Cited by 58 publications

References 13 publications

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region of Turkey

Micro-dose hCG as luteal phase support without exogenous progesterone administration: mathematical modelling of the hCG concentration in circulation and initial clinical experience

Excretion rate of progesterone in milk and faeces in lactating dairy cows with two levels of milk yield

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