Effects of lactation on metabolic and reproductive hormones in Lipizzaner mares

Heidler, B.; Parvizi, Nahid; Sauerwein, H.; Bruckmaier, R. M.; Heintges, U.; Aurich, Jörg; Aurich, Christine

doi:10.1016/s0739-7240(03)00044-4

Cited by 45 publications

(36 citation statements)

References 46 publications

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“…Therefore, murine mid-gestation may be comparable to human early gestation. Our findings of low IGF-I levels in the immediate postpartum period consistent with studies in other species, particularly ruminants, in which maternal IGF-I levels are low during lactation [30].…”

Section: Discussionsupporting

confidence: 89%

Quantitative ontogeny of murine insulin-like growth factor (IGF)-I, IGF-binding protein-3 and the IGF-related acid-labile subunit

Hwang

Lee

Cohen

2008

Growth Hormone & IGF Research

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We report the first ontological studies of IGF-I, IGFBP-3 and ALS in mice using newly-characterized sensitive, homologous immunoassays. Our results indicate that mice have a generally similar pattern in IGF-related axis components, with low levels early in life, increasing to peak during sexual maturation and declining thereafter. Significant gender differences in non-pregnant levels and dramatic changes during pregnancy were also found. Knowledge of the normal developmental changes in the murine IGF system and accurate tools for investigations of this system are a necessary foundation for research in this field.

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Section: Discussionsupporting

confidence: 89%

Quantitative ontogeny of murine insulin-like growth factor (IGF)-I, IGF-binding protein-3 and the IGF-related acid-labile subunit

Hwang

Lee

Cohen

2008

Growth Hormone & IGF Research

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“…Our leptin values are slightly higher, however comparison between studies is difficult since previous reports included animals in which reproductive status could have influenced their results. Both lactation and pregnancy have been reported to reduce leptinemia in equids (Heidler et al 2003). …”

Section: Discussionmentioning

confidence: 99%

Plasma leptin concentration in donkeys

Diez

López²,

Pérez³

et al. 2012

Veterinary Quarterly

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Background: Donkeys appear to be more predisposed than large breed horses to suffer from hyperlipemia. The reason for that predisposition is unknown but anorexia is a consistent feature of the disease. Leptin, a protein synthesized in fat tissue, is one of the major inhibitors of appetite in mammals. Objective: We hypothesized that donkeys could have elevated plasma leptin concentrations compared to horses. Animals and Methods: Blood samples were obtained from 50 donkeys for measurement of leptin, triglycerides (TGs), glucose, and insulin. Glucose/insulin ratio, modified insulin to glucose ratio, and reciprocal of the square root of insulin were calculated. Based on their body condition score (BCS), donkeys were classified as lean (n ¼ 18), normal (n ¼ 16), or overweight (n ¼ 16). The results were compared with reference values from our laboratory and with a group of horses (n ¼ 25) used as an internal control. Results: Values of both leptin and TGs in donkeys were above the horse reference range and also significantly higher than those of the control horses: leptin (11.2 AE 1.7 versus 5.8 AE 0.5 mg/L, p < 0.05) and TGs (0.93 AE 0.1 versus 0.54 AE 0.1 mmol/L, p < 0.01). Overweight donkeys had leptin (19.3 AE 2.9 mg/L) and TG (1.3 AE 0.2 mmol/L) concentrations that were significantly ( p < 0.01) higher than normal (9.4 AE 3.3 mg/L and 0.85 AE 0.1 mmol/L, respectively) and lean (5.5 AE 1.0 mg/L and 0.66 AE 0.1 mmol/L, respectively) donkeys. A significant positive correlation ( p < 0.01) was found between BCS and leptin (r ¼ 0.43), TGs (r ¼ 0.46), glucose (r ¼ 0.41), and insulin (r ¼ 0.40). Conclusion: Donkeys have higher plasma leptin concentrations than horses and leptin is correlated with BCS.

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“…The horse mare recovers its reproductive cycle soon after delivery (Jischa et al, 2008), showing foal heat, 5 to 12 days after parturition (Ginther, 1992). The resumption of ovarian activity with ovulation after parturition occurs in a physiologically short time frame (Heidler et al, 2003). The uterine involution and endometrial remodeling seem to follow the endocrine recovery of the reproductive system (Jischa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reproductive characteristics of foal heat in female donkeys

Carluccio¹,

Gloria²,

Robbe³

et al. 2017

Animal

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In this study, the first postpartum heat, termed the foal heat, characteristics and performance in female donkey (jenny) of Martina Franca are described. To this end, the follicular development of 42 jennies during foal heat was compared with that of 31 jennies at the third estrus after foaling. Estrus length (7.1 ± 0.9 and 6.8 ± 0.7 days), follicular development and preovulatory follicle size (43.7 ± 3.5 and 45.1 ± 2.5 mm) were similar between jennies during the foal heat and during the third estrus after foaling. The pregnancy rate at day 14 was significantly lower in the foal heat jennies (57.1%) than the third estrus jennies (82.3%). However, the pregnancy rate at day 14 in foal heat jennies increased significantly when the onset of foal heat was ⩾8 days after foaling (93.8%) or when the ovulation happened ⩾12 days after foaling (85.7%). The data provided in the present study suggest that the foal heat in the endangered jennies of Martina Franca could be successfully utilized to reduce the interpartum period if the onset of foal heat occurs >8 days after foaling.

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Effects of lactation on metabolic and reproductive hormones in Lipizzaner mares

Cited by 45 publications

References 46 publications

Quantitative ontogeny of murine insulin-like growth factor (IGF)-I, IGF-binding protein-3 and the IGF-related acid-labile subunit

Quantitative ontogeny of murine insulin-like growth factor (IGF)-I, IGF-binding protein-3 and the IGF-related acid-labile subunit

Plasma leptin concentration in donkeys

Reproductive characteristics of foal heat in female donkeys

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