The effect of the diversified signal of melatonin on milk yields in seasonally breeding sheep

Molik, Edyta; Pasternak, Marta; Błasiak, M; Misztal, Tomasz; Romanowicz, Katarzyna; Zieba, D

doi:10.7482/0003-9438-56-093

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…Subcutaneous implants containing melatonin (18 mg per animal; Melovine, CEVA Sante Animal, Libourne, France–2,3) were implanted into ewes of the G3 group in the third month of pregnancy, six weeks before parturition (May). Treatment with melatonin implants was repeated after 90 days (August) to induce refractoriness to melatonin signal [ 2 , 3 , 4 , 5 , 14 ]…”

Section: Methodsmentioning

confidence: 99%

“…The lactose was analysed used to the methods Bertrand [PN-68/A-86122]. The calcium and phosphorus were determined using the AAS flame methods with spectrometer parameters AA240 FS [AOAC 1995] [ 2 , 3 , 4 , 5 , 14 , 17 ]. Fatty acid content was determined with gas chromatography (chromatograph PYE-UNICAM series 104 with chromatography column SUPELCOWAX 10.30 m., ø 0.53 mm., 1.0 µm) as described by Mann [ 18 , 19 ].…”

Section: Methodsmentioning

confidence: 99%

“…Research has shown also that fat content in the milk of ewes that lambed in autumn was higher than in the milk of those that lambed in winter [ 12 , 13 ]. Our own studies conducted so far show that length of day affects both milk yield and chemical composition of sheep’s milk [ 5 , 14 ]. Since sheep’s milk is a product with high health-promoting value, it is important to investigate whether variation in length of the melatonin signal might modulate the milk’s chemical composition and its pro-health qualities.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Photoperiod Length and Treatment with Exogenous Melatonin during Pregnancy on Chemical Composition of Sheep’s Milk

Molik

Błasiak

Pustkowiak

2020

Animals

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The aim of the study was to determine the effect of photoperiod and exogenous melatonin on milk yield and chemical composition of sheep’s milk. Sheep (n = 60) were randomly divided into three groups: lambing in February (Group 1—n = 20), lambing in June (Group 2—n = 20), and lambing in June and treated with subcutaneous melatonin implants (Group 3—n = 20). Milk yield was higher for Group 1 and Group 2 than for Group 3 (p < 0.01). The milk of ewes of Groups 2 and 3 had a significantly (p < 0.01) higher content of dry matter, protein, and fat. Group 3 sheep’s milk contained significantly more (p < 0.01) of SFA (Saturated Fatty Acids). The highest content of MUFA (Monounsaturated Fatty Acids) and PUFA (Polyunsaturated Fatty Acids) was found in the samples collected from Group 1, the lowest was in the milk of Group 3 animals. The highest (p < 0.01) CLA, content was identified in the milk of Group 1, while the lowest was recorded for the milk obtained from sheep treated with exogenous melatonin (Group 3). The experiment carried out has shown that day length and treatment with exogenous melatonin modulate the chemical composition of milk.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Photoperiod Length and Treatment with Exogenous Melatonin during Pregnancy on Chemical Composition of Sheep’s Milk

Molik

Błasiak

Pustkowiak

2020

Animals

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“…In the study conducted by Mikolayunas et al (2008), it was stated that long-term photoperiod application during the lactation period increased the total lactation milk yield. Similarly, in the study conducted by Molik et al (2013), it was stated that dark application reduces lactation milk yield. In another study by Molik et al (2006), it was stated that ewes lambed in June produced 50% less milk than ewes lambed in January, and decreased day length conditions reduced milk yield.…”

Section: Discussionmentioning

confidence: 89%

“…As a consequence, plasma melatonin level also changes depending on the season (Dardente, 2007;Çınar et al, 2011). In many studies, it is stated that milk yield in sheep, goats and cows varies according to the length of photoperiod and therefore the melatonin concentration in the blood (Dahl et al, 2000;Misztal et al, 1997;Molik et al, 2006;Molik et al, 2013;Elhadi et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Controlling the photoperiod to raise the melatonin content of sheep milk. Photoperiod control and milk melatonin content

Keskin,

Gül,

Karaaslan

et al. 2024

J Hellenic Vet Med Soc

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The aim of this study was to determine the effect of changing photoperiod time on the melatonin content of sheep milk. The animal material of the study consisted of 40 heads of Awassi sheep that gave birth in May 2021. The sheep were given roughage containing dry matter with 2.5% of their body weight and concentrated feed (2400-2600 kcal ME and 15-16% Crude Protein) as the 40% of their milk yield each day during the lactation period. The experimental ewes were randomly assigned into two groups with 20 animals in each. While the control group sheep were managed with normal day-time length during the lactation, the photoperiod restriction group were kept in the shed with 16 hours of darkness and 8 hours of daylight for 2 months. At the end of the two months, ewes of the both groups were managed in normal daylight until the end of lactation period. During the photoperiod restriction term, milk samples were taken at an interval of 15 days, while the milk composition was determined by a milk analyser and melatonin contents were determined by using LC MS/MS. In addition, lactation milk yield and lactation periods were estimated for all sheep. Statistical evaluation of the obtained data was done by using the SPSS package program. At the end of the study, the application of the extended dark period was found to be affected milk yield (P<0.05) as well as melatonin amount in the milk (P<0.001). Significantly higher melatonin amount was observed in the milk of sheep kept in a long-term dark environment compared to those exposed to normal photoperiod (11.1±7.24 pg/ml vs 6.1±4.55 pg/ml; P<0.001). As a result, it was determined that the prolonged dark period during a day increases the milk melatonin content. It can be also stated that the sheep's milk to be produced with this application could be a product that could take place in the functional food market.

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Profile of gonadotropic hormone secretion in sheep with disturbed rhythm of seasonality

Molik¹,

Błasiak²,

Misztal³

et al. 2017

CZECH J ANIM SCI

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Molik E., Błasiak M., Misztal T., Romanowicz K., Zięba D.A. (2017): Profile of gonadotropic hormone secretion in sheep with disturbed rhythm of seasonality. Czech J. Anim. Sci., 62, 242-248.The effect of artificial conditions of a short daylight period (16 h darkness (D): 8 h light (L)) and exogenous melatonin on milk yield parameters of sheep during spring and summer was examined to determine the impact of using sheep for milk on the secretion level of gonadotrophic hormones. The research was conducted on 60 sheep lambed in February. After raising the lambs, the sheep were divided into 3 groups and assigned for dairy use (May-September). The mothers in the control Group 1 (G1) were maintained under natural daylight conditions. The sheep in Group 2 (G2) were maintained under conditions of an artificial photoperiod (16 h D : 8 h L). Meanwhile, the mothers in Group 3 (G3) were given melatonin implants. A 6-hour collection of blood from 6 sheep of each group was performed every 4 weeks. The concentrations of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) in plasma were measured using radioimmunoassay. The average LH concentration in G1 gradually increased since May (5.32 ± 0.2 ng/ml), reaching the highest value in August (6.70 ± 0.2 ng/ml). In G2, the increase in LH occurred 4 weeks after the introduction of the 16 h D : 8 h L condition (6.26 ± 0.2 ng/ml). The maximum LH concentration in G3 was noted in August (7.31 ± 0.2 ng/ml). The average FSH concentration in G1 gradually increased since May (6.59 ± 0.2 ng/ml), reaching the highest value in August (10.50 ± 2.6 ng/ml). In G2, there was a significant increase in the FSH concentration in June (9.00 ± 0.3 ng/ml). In the final period during lactation, the FSH concentrations in G2 (13.51 ± 1.3 ng/ml) and G3 (13.60 ± 1.9 ng/ml) were higher than in G1. The results indicate that using sheep for milk does not inhibit the secretion of gonadotropic hormones induced by the simulation of short daylight conditions and exogenous melatonin.

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The effect of the diversified signal of melatonin on milk yields in seasonally breeding sheep

Cited by 4 publications

References 23 publications

Impact of Photoperiod Length and Treatment with Exogenous Melatonin during Pregnancy on Chemical Composition of Sheep’s Milk

Impact of Photoperiod Length and Treatment with Exogenous Melatonin during Pregnancy on Chemical Composition of Sheep’s Milk

Controlling the photoperiod to raise the melatonin content of sheep milk. Photoperiod control and milk melatonin content

Profile of gonadotropic hormone secretion in sheep with disturbed rhythm of seasonality

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