Milk yield, lactation parameters and prolactin secretion characteristics in sheep treated with melatonin implants during pregnancy and lactation in long-day conditions

Misztal, Tomasz; Molik, Edyta; Nowakowski, Michał; Marciniak, Elżbieta

doi:10.1016/j.livsci.2018.10.018

Cited by 6 publications

(12 citation statements)

References 31 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%

“…In short-day animals exposed to decreasing photoperiod length, melatonin levels were found to increase while prolactin secretion was in decline [ 2 , 3 ]. Changes in prolactin secretion in lactating sheep influence the amount of milk produced [ 4 , 5 , 6 ]. Sheep’s milk is richest in vaccenic acid, precursor of CLA, and this content is also subject to seasonal fluctuations from—0.54% in winter to 1.28% in summer [ 7 , 8 ].…”

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

Self Cite

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“…Moreover, MEL was applied 6 wk before and 6 wk after lambing (2 doses with a 90-d interval). So, according to Misztal et al (2018), milk yield was greater in the long-day lactating ewes, in comparison with short-day (−20%) and short-day treated with MEL (−32%) lactating ewes. Interestingly, plasma MEL mean concentration at late pregnancy was inversely related to daylight duration and, on average, greater in the long-day than in the short-day MEL-treated lactating ewes.…”

Section: Introductionmentioning

confidence: 85%

“…In later research, Misztal et al (2018) revisited the interaction of MEL and photoperiod in Polish Longwool sheep, with the aim of mitigating the negative effects of late lactation in ewes lambing under long-day photoperiod (June), when compared with those naturally lambing in short-day photoperiod (January). It should be stressed, to avoid misunderstandings with the terminology previously used, that in this case milking (started after a long suckling) was consequently performed mainly under short-day (autumn) and long-day (spring) photoperiods, respectively.…”

Section: Introductionmentioning

confidence: 99%

Responses to melatonin of 2 breeds of dairy ewes in early lactation under autumn photoperiod conditions

Elhadi

Salama

Such

et al. 2022

Journal of Dairy Science

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A total of 72 dairy ewes of 2 breeds (MN, Manchega, 72.4 ± 1.9 kg of body weight, n = 36; LC, Lacaune, 77.7 ± 2.3 kg of body weight; n = 36) were used to evaluate the lactational effects of melatonin implants in early lactation and under the short-day photoperiod conditions of autumn (experiment was centered on the winter solstice). Ewes lambed in autumn and were penned indoors in 12 balanced groups of 6 ewes by breed, body weight, age, and number of lambs, and randomly assigned to a 2 × 2 × 3 factorial design (treatment × breed × replicate). Ewes suckled their lambs for 28 d. Treatments were (1) melatonin (MEL), which received 1 subcutaneous implant of melatonin (18 mg/ewe) in the ear base at 35 ± 1 d (1 wk after lamb weaning), and (2) control, which did not receive any treatment. Ewes were fed ad libitum a total mixed ration (forage: concentrate, 60:40) and machine milked twice daily. Daily milk yield was automatically recorded from d 29 to 105 of lactation and sampled every 2 wk for composition. Jugular blood was sampled for plasma hormone analyses at 30, 50, 80, 110, and 124 d of lactation. Body reserves were assessed every 2 wk. Feed intake was measured by pen during 3 separated periods after the start of the treatments (wk 2 to 3, wk 6 to 7, and wk 10 to 11). Feed intake, and milk yield and composition varied by breed, but no MEL effects were detected on dry matter intake, milk yield, milk composition, or fat and protein standardized milk in either breed. As a result of the unique composition of the implants and the variable body weights of the ewes, the MEL treatment dose (on average, 0.24 mg/kg of body weight) was 6.8% greater in the MN (lighter) than in the LC (heavier) ewes. Plasmatic melatonin markedly increased in the MEL-treated ewes (on average, 111%), but despite the amount of MEL used, the MN responded greatly compared with the LC ewes (150 vs. 63%, respectively). No differences in basal plasmatic melatonin were detected between breeds (6.4 ± 1.1 pg/mL, on average), indicating the greater responsiveness to the implants of the lighter MN ewes. Plasmatic prolactin tended to decrease in the MEL-treated ewes (−35%, on average), but the effect was significant only in the MN ewes (−54%), in agreement with their greater response to MEL. No effects of MEL treatment were detected on plasmatic IGF-I in either breed. Moreover, body reserves did not vary by effect of MEL treatment or breed throughout the experiment. In conclusion, the use of exogenous melatonin as MEL implants, together with the endogenous melatonin naturally produced under short-day photoperiod conditions, had no effects on the early-lactation performances of dairy sheep, despite their breed and level of production.

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The implications of various gene variant combinations on breeding values for Awassi ewe milk production

Jawasreh,

Al-Amareen

2023

Vet World

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Background and Aim: Milk production is an important factor to consider in selecting Awassi sheep. This trait is influenced by various genes that can be managed to boost production. The breeding values (BVs) for milk production in Jordan’s Awassi sheep flocks have been established. This study determined how combined gene variants of BLG, PRL, CSN3, CSN1S1, and CSN2 affect the estimated BVs (EBVs) for milk production in Awassi sheep. Materials and Methods: Milk and blood samples were collected from 391 Awassi sheep, which was then subjected to molecular analysis through sequencing in order to identify potential alleles and genotypes that could be linked to the EBVs of milk. Results: The predicted BVs for milk were significantly influenced by PRL and CSN3 gene variants. Through performing the act of epistasis, the i nteractions of BLG with CSN3 and –CSN1S1 greatly impacted EBVs for milk production. Likewise, the three-way interaction among PRL, CSN3, and CSN1S1, as well as the combined effect of CSN3 with CSN1S1 and CNS1 significantly improved BVs for milk production. When the breeding selection program incorporates the polymorphisms of these genes, gains in milk production can be obtained. Conclusion: Alleles within the examined genomic areas are crucial for evaluating BVs and maximizing genetic gain in milk production. Keywords: Awassi sheep, breeding value, milk production.

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Milk yield, lactation parameters and prolactin secretion characteristics in sheep treated with melatonin implants during pregnancy and lactation in long-day conditions

Cited by 6 publications

References 31 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

Responses to melatonin of 2 breeds of dairy ewes in early lactation under autumn photoperiod conditions

The implications of various gene variant combinations on breeding values for Awassi ewe milk production

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